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 and  tags in your source with class=prettyprint.
 *    You can also use the (html deprecated)  tag, but the pretty printer
 *    needs to do more substantial DOM manipulations to support that, so some
 *    css styles may not be preserved.
 * That's it.  I wanted to keep the API as simple as possible, so there's no
 * need to specify which language the code is in.
 *
 * Change log:
 * cbeust, 2006/08/22
 *   Java annotations (start with "@") are now captured as literals ("lit")
 */

// JSLint declarations
/*global console, document, navigator, setTimeout, window */

/**
 * Split {@code prettyPrint} into multiple timeouts so as not to interfere with
 * UI events.
 * If set to {@code false}, {@code prettyPrint()} is synchronous.
 */
var PR_SHOULD_USE_CONTINUATION = true;

/** the number of characters between tab columns */
var PR_TAB_WIDTH = 8;

/** Walks the DOM returning a properly escaped version of innerHTML.
  * @param {Node} node
  * @param {Array.<string>} out output buffer that receives chunks of HTML.
  */
var PR_normalizedHtml;

/** Contains functions for creating and registering new language handlers.
  * @type {Object}
  */
var PR;

/** Pretty print a chunk of code.
  *
  * @param {string} sourceCodeHtml code as html
  * @return {string} code as html, but prettier
  */
var prettyPrintOne;
/** find all the < pre > and < code > tags in the DOM with class=prettyprint
  * and prettify them.
  * @param {Function} opt_whenDone if specified, called when the last entry
  *     has been finished.
  */
var prettyPrint;

/** browser detection. @extern */
function _pr_isIE6() {
  var isIE6 = navigator && navigator.userAgent &&
      /\bMSIE 6\./.test(navigator.userAgent);
  _pr_isIE6 = function () { return isIE6; };
  return isIE6;
}


(function () {
  /** Splits input on space and returns an Object mapping each non-empty part to
    * true.
    */
  function wordSet(words) {
    words = words.split(/ /g);
    var set = {};
    for (var i = words.length; --i >= 0;) {
      var w = words[i];
      if (w) { set[w] = null; }
    }
    return set;
  }

  // Keyword lists for various languages.
  var FLOW_CONTROL_KEYWORDS =
      "break continue do else for if return while ";
  var C_KEYWORDS = FLOW_CONTROL_KEYWORDS + "auto case char const default " +
      "double enum extern float goto int long register short signed sizeof " +
      "static struct switch typedef union unsigned void volatile ";
  var COMMON_KEYWORDS = C_KEYWORDS + "catch class delete false import " +
      "new operator private protected public this throw true try ";
  var CPP_KEYWORDS = COMMON_KEYWORDS + "alignof align_union asm axiom bool " +
      "concept concept_map const_cast constexpr decltype " +
      "dynamic_cast explicit export friend inline late_check " +
      "mutable namespace nullptr reinterpret_cast static_assert static_cast " +
      "template typeid typename typeof using virtual wchar_t where ";
  var JAVA_KEYWORDS = COMMON_KEYWORDS +
      "boolean byte extends final finally implements import instanceof null " +
      "native package strictfp super synchronized throws transient ";
  var CSHARP_KEYWORDS = JAVA_KEYWORDS +
      "as base by checked decimal delegate descending event " +
      "fixed foreach from group implicit in interface internal into is lock " +
      "object out override orderby params readonly ref sbyte sealed " +
      "stackalloc string select uint ulong unchecked unsafe ushort var ";
  var JSCRIPT_KEYWORDS = COMMON_KEYWORDS +
      "debugger eval export function get null set undefined var with " +
      "Infinity NaN ";
  var PERL_KEYWORDS = "caller delete die do dump elsif eval exit foreach for " +
      "goto if import last local my next no our print package redo require " +
      "sub undef unless until use wantarray while BEGIN END ";
  var PYTHON_KEYWORDS = FLOW_CONTROL_KEYWORDS + "and as assert class def del " +
      "elif except exec finally from global import in is lambda " +
      "nonlocal not or pass print raise try with yield " +
      "False True None ";
  var RUBY_KEYWORDS = FLOW_CONTROL_KEYWORDS + "alias and begin case class def" +
      " defined elsif end ensure false in module next nil not or redo rescue " +
      "retry self super then true undef unless until when yield BEGIN END ";
  var SH_KEYWORDS = FLOW_CONTROL_KEYWORDS + "case done elif esac eval fi " +
      "function in local set then until ";
  var ALL_KEYWORDS = (
      CPP_KEYWORDS + CSHARP_KEYWORDS + JSCRIPT_KEYWORDS + PERL_KEYWORDS +
      PYTHON_KEYWORDS + RUBY_KEYWORDS + SH_KEYWORDS);

  // token style names.  correspond to css classes
  /** token style for a string literal */
  var PR_STRING = 'str';
  /** token style for a keyword */
  var PR_KEYWORD = 'kwd';
  /** token style for a comment */
  var PR_COMMENT = 'com';
  /** token style for a type */
  var PR_TYPE = 'typ';
  /** token style for a literal value.  e.g. 1, null, true. */
  var PR_LITERAL = 'lit';
  /** token style for a punctuation string. */
  var PR_PUNCTUATION = 'pun';
  /** token style for a punctuation string. */
  var PR_PLAIN = 'pln';

  /** token style for an sgml tag. */
  var PR_TAG = 'tag';
  /** token style for a markup declaration such as a DOCTYPE. */
  var PR_DECLARATION = 'dec';
  /** token style for embedded source. */
  var PR_SOURCE = 'src';
  /** token style for an sgml attribute name. */
  var PR_ATTRIB_NAME = 'atn';
  /** token style for an sgml attribute value. */
  var PR_ATTRIB_VALUE = 'atv';

  /**
   * A class that indicates a section of markup that is not code, e.g. to allow
   * embedding of line numbers within code listings.
   */
  var PR_NOCODE = 'nocode';

  function isWordChar(ch) {
    return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z');
  }

  /** Splice one array into another.
    * Like the python <code>
    * container[containerPosition:containerPosition + countReplaced] = inserted
    * </code>
    * @param {Array} inserted
    * @param {Array} container modified in place
    * @param {Number} containerPosition
    * @param {Number} countReplaced
    */
  function spliceArrayInto(
      inserted, container, containerPosition, countReplaced) {
    inserted.unshift(containerPosition, countReplaced || 0);
    try {
      container.splice.apply(container, inserted);
    } finally {
      inserted.splice(0, 2);
    }
  }

  /** A set of tokens that can precede a regular expression literal in
    * javascript.
    * http://www.mozilla.org/js/language/js20/rationale/syntax.html has the full
    * list, but I've removed ones that might be problematic when seen in
    * languages that don't support regular expression literals.
    *
    * <p>Specifically, I've removed any keywords that can't precede a regexp
    * literal in a syntactically legal javascript program, and I've removed the
    * "in" keyword since it's not a keyword in many languages, and might be used
    * as a count of inches.
    * @private
    */
  var REGEXP_PRECEDER_PATTERN = function () {
      var preceders = [
          "!", "!=", "!==", "#", "%", "%=", "&", "&&", "&&=",
          "&=", "(", "*", "*=", /* "+", */ "+=", ",", /* "-", */ "-=",
          "->", /*".", "..", "...", handled below */ "/", "/=", ":", "::", ";",
          "<", "<<", "<<=", "<=", "=", "==", "===", ">",
          ">=", ">>", ">>=", ">>>", ">>>=", "?", "@", "[",
          "^", "^=", "^^", "^^=", "{", "|", "|=", "||",
          "||=", "~" /* handles =~ and !~ */,
          "break", "case", "continue", "delete",
          "do", "else", "finally", "instanceof",
          "return", "throw", "try", "typeof"
          ];
      var pattern = '(?:' +
          '(?:(?:^|[^0-9.])\\.{1,3})|' +  // a dot that's not part of a number
          '(?:(?:^|[^\\+])\\+)|' +  // allow + but not ++
          '(?:(?:^|[^\\-])-)';  // allow - but not --
      for (var i = 0; i < preceders.length; ++i) {
        var preceder = preceders[i];
        if (isWordChar(preceder.charAt(0))) {
          pattern += '|\\b' + preceder;
        } else {
          pattern += '|' + preceder.replace(/([^=<>:&])/g, '\\$1');
        }
      }
      pattern += '|^)\\s*$';  // matches at end, and matches empty string
      return new RegExp(pattern);
      // CAVEAT: this does not properly handle the case where a regular
      // expression immediately follows another since a regular expression may
      // have flags for case-sensitivity and the like.  Having regexp tokens
      // adjacent is not
      // valid in any language I'm aware of, so I'm punting.
      // TODO: maybe style special characters inside a regexp as punctuation.
    }();

  // Define regexps here so that the interpreter doesn't have to create an
  // object each time the function containing them is called.
  // The language spec requires a new object created even if you don't access
  // the $1 members.
  var pr_amp = /&/g;
  var pr_lt = /</g;
  var pr_gt = />/g;
  var pr_quot = /\"/g;
  /** like textToHtml but escapes double quotes to be attribute safe. */
  function attribToHtml(str) {
    return str.replace(pr_amp, '&amp;')
        .replace(pr_lt, '&lt;')
        .replace(pr_gt, '&gt;')
        .replace(pr_quot, '&quot;');
  }

  /** escapest html special characters to html. */
  function textToHtml(str) {
    return str.replace(pr_amp, '&amp;')
        .replace(pr_lt, '&lt;')
        .replace(pr_gt, '&gt;');
  }


  var pr_ltEnt = /&lt;/g;
  var pr_gtEnt = /&gt;/g;
  var pr_aposEnt = /&apos;/g;
  var pr_quotEnt = /&quot;/g;
  var pr_ampEnt = /&amp;/g;
  var pr_nbspEnt = /&nbsp;/g;
  /** unescapes html to plain text. */
  function htmlToText(html) {
    var pos = html.indexOf('&');
    if (pos < 0) { return html; }
    // Handle numeric entities specially.  We can't use functional substitution
    // since that doesn't work in older versions of Safari.
    // These should be rare since most browsers convert them to normal chars.
    for (--pos; (pos = html.indexOf('&#', pos + 1)) >= 0;) {
      var end = html.indexOf(';', pos);
      if (end >= 0) {
        var num = html.substring(pos + 3, end);
        var radix = 10;
        if (num && num.charAt(0) === 'x') {
          num = num.substring(1);
          radix = 16;
        }
        var codePoint = parseInt(num, radix);
        if (!isNaN(codePoint)) {
          html = (html.substring(0, pos) + String.fromCharCode(codePoint) +
                  html.substring(end + 1));
        }
      }
    }

    return html.replace(pr_ltEnt, '<')
        .replace(pr_gtEnt, '>')
        .replace(pr_aposEnt, "'")
        .replace(pr_quotEnt, '"')
        .replace(pr_ampEnt, '&')
        .replace(pr_nbspEnt, ' ');
  }

  /** is the given node's innerHTML normally unescaped? */
  function isRawContent(node) {
    return 'XMP' === node.tagName;
  }

  function normalizedHtml(node, out) {
    switch (node.nodeType) {
      case 1:  // an element
        var name = node.tagName.toLowerCase();
        out.push('<', name);
        for (var i = 0; i < node.attributes.length; ++i) {
          var attr = node.attributes[i];
          if (!attr.specified) { continue; }
          out.push(' ');
          normalizedHtml(attr, out);
        }
        out.push('>');
        for (var child = node.firstChild; child; child = child.nextSibling) {
          normalizedHtml(child, out);
        }
        if (node.firstChild || !/^(?:br|link|img)$/.test(name)) {
          out.push('<\/', name, '>');
        }
        break;
      case 2: // an attribute
        out.push(node.name.toLowerCase(), '="', attribToHtml(node.value), '"');
        break;
      case 3: case 4: // text
        out.push(textToHtml(node.nodeValue));
        break;
    }
  }

  var PR_innerHtmlWorks = null;
  function getInnerHtml(node) {
    // inner html is hopelessly broken in Safari 2.0.4 when the content is
    // an html description of well formed XML and the containing tag is a PRE
    // tag, so we detect that case and emulate innerHTML.
    if (null === PR_innerHtmlWorks) {
      var testNode = document.createElement('PRE');
      testNode.appendChild(
          document.createTextNode('<!DOCTYPE foo PUBLIC "foo bar">\n<foo />'));
      PR_innerHtmlWorks = !/</.test(testNode.innerHTML);
    }

    if (PR_innerHtmlWorks) {
      var content = node.innerHTML;
      // XMP tags contain unescaped entities so require special handling.
      if (isRawContent(node)) {
        content = textToHtml(content);
      }
      return content;
    }

    var out = [];
    for (var child = node.firstChild; child; child = child.nextSibling) {
      normalizedHtml(child, out);
    }
    return out.join('');
  }

  /** returns a function that expand tabs to spaces.  This function can be fed
    * successive chunks of text, and will maintain its own internal state to
    * keep track of how tabs are expanded.
    * @return {function (string) : string} a function that takes
    *   plain text and return the text with tabs expanded.
    * @private
    */
  function makeTabExpander(tabWidth) {
    var SPACES = '                ';
    var charInLine = 0;

    return function (plainText) {
      // walk over each character looking for tabs and newlines.
      // On tabs, expand them.  On newlines, reset charInLine.
      // Otherwise increment charInLine
      var out = null;
      var pos = 0;
      for (var i = 0, n = plainText.length; i < n; ++i) {
        var ch = plainText.charAt(i);

        switch (ch) {
          case '\t':
            if (!out) { out = []; }
            out.push(plainText.substring(pos, i));
            // calculate how much space we need in front of this part
            // nSpaces is the amount of padding -- the number of spaces needed
            // to move us to the next column, where columns occur at factors of
            // tabWidth.
            var nSpaces = tabWidth - (charInLine % tabWidth);
            charInLine += nSpaces;
            for (; nSpaces >= 0; nSpaces -= SPACES.length) {
              out.push(SPACES.substring(0, nSpaces));
            }
            pos = i + 1;
            break;
          case '\n':
            charInLine = 0;
            break;
          default:
            ++charInLine;
        }
      }
      if (!out) { return plainText; }
      out.push(plainText.substring(pos));
      return out.join('');
    };
  }

  // The below pattern matches one of the following
  // (1) /[^<]+/ : A run of characters other than '<'
  // (2) /<!--.*?-->/: an HTML comment
  // (3) /<!\[CDATA\[.*?\]\]>/: a cdata section
  // (3) /<\/?[a-zA-Z][^>]*>/ : A probably tag that should not be highlighted
  // (4) /</ : A '<' that does not begin a larger chunk.  Treated as 1
  var pr_chunkPattern =
  /(?:[^<]+|<!--[\s\S]*?-->|<!\[CDATA\[([\s\S]*?)\]\]>|<\/?[a-zA-Z][^>]*>|<)/g;
  var pr_commentPrefix = /^<!--/;
  var pr_cdataPrefix = /^<\[CDATA\[/;
  var pr_brPrefix = /^<br\b/i;
  var pr_tagNameRe = /^<(\/?)([a-zA-Z]+)/;

  /** split markup into chunks of html tags (style null) and
    * plain text (style {@link #PR_PLAIN}), converting tags which are
    * significant for tokenization (<br>) into their textual equivalent.
    *
    * @param {string} s html where whitespace is considered significant.
    * @return {Object} source code and extracted tags.
    * @private
    */
  function extractTags(s) {
    // since the pattern has the 'g' modifier and defines no capturing groups,
    // this will return a list of all chunks which we then classify and wrap as
    // PR_Tokens
    var matches = s.match(pr_chunkPattern);
    var sourceBuf = [];
    var sourceBufLen = 0;
    var extractedTags = [];
    if (matches) {
      for (var i = 0, n = matches.length; i < n; ++i) {
        var match = matches[i];
        if (match.length > 1 && match.charAt(0) === '<') {
          if (pr_commentPrefix.test(match)) { continue; }
          if (pr_cdataPrefix.test(match)) {
            // strip CDATA prefix and suffix.  Don't unescape since it's CDATA
            sourceBuf.push(match.substring(9, match.length - 3));
            sourceBufLen += match.length - 12;
          } else if (pr_brPrefix.test(match)) {
            // <br> tags are lexically significant so convert them to text.
            // This is undone later.
            sourceBuf.push('\n');
            ++sourceBufLen;
          } else {
            if (match.indexOf(PR_NOCODE) >= 0 && isNoCodeTag(match)) {
              // A <span class="nocode"> will start a section that should be
              // ignored.  Continue walking the list until we see a matching end
              // tag.
              var name = match.match(pr_tagNameRe)[2];
              var depth = 1;
              end_tag_loop:
              for (var j = i + 1; j < n; ++j) {
                var name2 = matches[j].match(pr_tagNameRe);
                if (name2 && name2[2] === name) {
                  if (name2[1] === '/') {
                    if (--depth === 0) { break end_tag_loop; }
                  } else {
                    ++depth;
                  }
                }
              }
              if (j < n) {
                extractedTags.push(
                    sourceBufLen, matches.slice(i, j + 1).join(''));
                i = j;
              } else {  // Ignore unclosed sections.
                extractedTags.push(sourceBufLen, match);
              }
            } else {
              extractedTags.push(sourceBufLen, match);
            }
          }
        } else {
          var literalText = htmlToText(match);
          sourceBuf.push(literalText);
          sourceBufLen += literalText.length;
        }
      }
    }
    return { source: sourceBuf.join(''), tags: extractedTags };
  }

  /** True if the given tag contains a class attribute with the nocode class. */
  function isNoCodeTag(tag) {
    return !!tag
        // First canonicalize the representation of attributes
        .replace(/\s(\w+)\s*=\s*(?:\"([^\"]*)\"|'([^\']*)'|(\S+))/g,
                 ' $1="$2$3$4"')
        // Then look for the attribute we want.
        .match(/[cC][lL][aA][sS][sS]=\"[^\"]*\bnocode\b/);
  }

  /** Given triples of [style, pattern, context] returns a lexing function,
    * The lexing function interprets the patterns to find token boundaries and
    * returns a decoration list of the form
    * [index_0, style_0, index_1, style_1, ..., index_n, style_n]
    * where index_n is an index into the sourceCode, and style_n is a style
    * constant like PR_PLAIN.  index_n-1 <= index_n, and style_n-1 applies to
    * all characters in sourceCode[index_n-1:index_n].
    *
    * The stylePatterns is a list whose elements have the form
    * [style : string, pattern : RegExp, context : RegExp, shortcut : string].
    &
    * Style is a style constant like PR_PLAIN.
    *
    * Pattern must only match prefixes, and if it matches a prefix and context
    * is null or matches the last non-comment token parsed, then that match is
    * considered a token with the same style.
    *
    * Context is applied to the last non-whitespace, non-comment token
    * recognized.
    *
    * Shortcut is an optional string of characters, any of which, if the first
    * character, gurantee that this pattern and only this pattern matches.
    *
    * @param {Array} shortcutStylePatterns patterns that always start with
    *   a known character.  Must have a shortcut string.
    * @param {Array} fallthroughStylePatterns patterns that will be tried in
    *   order if the shortcut ones fail.  May have shortcuts.
    *
    * @return {function (string, number?) : Array.<number|string>} a
    *   function that takes source code and returns a list of decorations.
    */
  function createSimpleLexer(shortcutStylePatterns,
                             fallthroughStylePatterns) {
    var shortcuts = {};
    (function () {
      var allPatterns = shortcutStylePatterns.concat(fallthroughStylePatterns);
      for (var i = allPatterns.length; --i >= 0;) {
        var patternParts = allPatterns[i];
        var shortcutChars = patternParts[3];
        if (shortcutChars) {
          for (var c = shortcutChars.length; --c >= 0;) {
            shortcuts[shortcutChars.charAt(c)] = patternParts;
          }
        }
      }
    })();

    var nPatterns = fallthroughStylePatterns.length;
    var notWs = /\S/;

    return function (sourceCode, opt_basePos) {
      opt_basePos = opt_basePos || 0;
      var decorations = [opt_basePos, PR_PLAIN];
      var lastToken = '';
      var pos = 0;  // index into sourceCode
      var tail = sourceCode;

      while (tail.length) {
        var style;
        var token = null;
        var match;

        var patternParts = shortcuts[tail.charAt(0)];
        if (patternParts) {
          match = tail.match(patternParts[1]);
          token = match[0];
          style = patternParts[0];
        } else {
          for (var i = 0; i < nPatterns; ++i) {
            patternParts = fallthroughStylePatterns[i];
            var contextPattern = patternParts[2];
            if (contextPattern && !contextPattern.test(lastToken)) {
              // rule can't be used
              continue;
            }
            match = tail.match(patternParts[1]);
            if (match) {
              token = match[0];
              style = patternParts[0];
              break;
            }
          }

          if (!token) {  // make sure that we make progress
            style = PR_PLAIN;
            token = tail.substring(0, 1);
          }
        }

        decorations.push(opt_basePos + pos, style);
        pos += token.length;
        tail = tail.substring(token.length);
        if (style !== PR_COMMENT && notWs.test(token)) { lastToken = token; }
      }
      return decorations;
    };
  }

  var PR_MARKUP_LEXER = createSimpleLexer([], [
      [PR_PLAIN,       /^[^<]+/, null],
      [PR_DECLARATION, /^<!\w[^>]*(?:>|$)/, null],
      [PR_COMMENT,     /^<!--[\s\S]*?(?:-->|$)/, null],
      [PR_SOURCE,      /^<\?[\s\S]*?(?:\?>|$)/, null],
      [PR_SOURCE,      /^<%[\s\S]*?(?:%>|$)/, null],
      [PR_SOURCE,
       // Tags whose content is not escaped, and which contain source code.
       /^<(script|style|xmp)\b[^>]*>[\s\S]*?<\/\1\b[^>]*>/i, null],
      [PR_TAG,         /^<\/?\w[^<>]*>/, null]
      ]);
  // Splits any of the source|style|xmp entries above into a start tag,
  // source content, and end tag.
  var PR_SOURCE_CHUNK_PARTS = /^(<[^>]*>)([\s\S]*)(<\/[^>]*>)$/;
  /** split markup on tags, comments, application directives, and other top
    * level constructs.  Tags are returned as a single token - attributes are
    * not yet broken out.
    * @private
    */
  function tokenizeMarkup(source) {
    var decorations = PR_MARKUP_LEXER(source);
    for (var i = 0; i < decorations.length; i += 2) {
      if (decorations[i + 1] === PR_SOURCE) {
        var start, end;
        start = decorations[i];
        end = i + 2 < decorations.length ? decorations[i + 2] : source.length;
        // Split out start and end script tags as actual tags, and leave the
        // body with style SCRIPT.
        var sourceChunk = source.substring(start, end);
        var match = sourceChunk.match(PR_SOURCE_CHUNK_PARTS);
        if (match) {
          decorations.splice(
              i, 2,
              start, PR_TAG,  // the open chunk
              start + match[1].length, PR_SOURCE,
              start + match[1].length + (match[2] || '').length, PR_TAG);
        }
      }
    }
    return decorations;
  }

  var PR_TAG_LEXER = createSimpleLexer([
      [PR_ATTRIB_VALUE, /^\'[^\']*(?:\'|$)/, null, "'"],
      [PR_ATTRIB_VALUE, /^\"[^\"]*(?:\"|$)/, null, '"'],
      [PR_PUNCTUATION,  /^[<>\/=]+/, null, '<>/=']
      ], [
      [PR_TAG,          /^[\w:\-]+/, /^</],
      [PR_ATTRIB_VALUE, /^[\w\-]+/, /^=/],
      [PR_ATTRIB_NAME,  /^[\w:\-]+/, null],
      [PR_PLAIN,        /^\s+/, null, ' \t\r\n']
      ]);
  /** split tags attributes and their values out from the tag name, and
    * recursively lex source chunks.
    * @private
    */
  function splitTagAttributes(source, decorations) {
    for (var i = 0; i < decorations.length; i += 2) {
      var style = decorations[i + 1];
      if (style === PR_TAG) {
        var start, end;
        start = decorations[i];
        end = i + 2 < decorations.length ? decorations[i + 2] : source.length;
        var chunk = source.substring(start, end);
        var subDecorations = PR_TAG_LEXER(chunk, start);
        spliceArrayInto(subDecorations, decorations, i, 2);
        i += subDecorations.length - 2;
      }
    }
    return decorations;
  }

  /** returns a function that produces a list of decorations from source text.
    *
    * This code treats ", ', and ` as string delimiters, and \ as a string
    * escape.  It does not recognize perl's qq() style strings.
    * It has no special handling for double delimiter escapes as in basic, or
    * the tripled delimiters used in python, but should work on those regardless
    * although in those cases a single string literal may be broken up into
    * multiple adjacent string literals.
    *
    * It recognizes C, C++, and shell style comments.
    *
    * @param {Object} options a set of optional parameters.
    * @return {function (string) : Array.<string|number>} a
    *     decorator that takes sourceCode as plain text and that returns a
    *     decoration list
    */
  function sourceDecorator(options) {
    var shortcutStylePatterns = [], fallthroughStylePatterns = [];
    if (options.tripleQuotedStrings) {
      // '''multi-line-string''', 'single-line-string', and double-quoted
      shortcutStylePatterns.push(
          [PR_STRING,  /^(?:\'\'\'(?:[^\'\\]|\\[\s\S]|\'{1,2}(?=[^\']))*(?:\'\'\'|$)|\"\"\"(?:[^\"\\]|\\[\s\S]|\"{1,2}(?=[^\"]))*(?:\"\"\"|$)|\'(?:[^\\\']|\\[\s\S])*(?:\'|$)|\"(?:[^\\\"]|\\[\s\S])*(?:\"|$))/,
           null, '\'"']);
    } else if (options.multiLineStrings) {
      // 'multi-line-string', "multi-line-string"
      shortcutStylePatterns.push(
          [PR_STRING,  /^(?:\'(?:[^\\\']|\\[\s\S])*(?:\'|$)|\"(?:[^\\\"]|\\[\s\S])*(?:\"|$)|\`(?:[^\\\`]|\\[\s\S])*(?:\`|$))/,
           null, '\'"`']);
    } else {
      // 'single-line-string', "single-line-string"
      shortcutStylePatterns.push(
          [PR_STRING,
           /^(?:\'(?:[^\\\'\r\n]|\\.)*(?:\'|$)|\"(?:[^\\\"\r\n]|\\.)*(?:\"|$))/,
           null, '"\'']);
    }
    fallthroughStylePatterns.push(
        [PR_PLAIN,   /^(?:[^\'\"\`\/\#]+)/, null, ' \r\n']);
    if (options.hashComments) {
      shortcutStylePatterns.push([PR_COMMENT, /^#[^\r\n]*/, null, '#']);
    }
    if (options.cStyleComments) {
      fallthroughStylePatterns.push([PR_COMMENT, /^\/\/[^\r\n]*/, null]);
      fallthroughStylePatterns.push(
          [PR_COMMENT, /^\/\*[\s\S]*?(?:\*\/|$)/, null]);
    }
    if (options.regexLiterals) {
      var REGEX_LITERAL = (
          // A regular expression literal starts with a slash that is
          // not followed by * or / so that it is not confused with
          // comments.
          '^/(?=[^/*])'
          // and then contains any number of raw characters,
          + '(?:[^/\\x5B\\x5C]'
          // escape sequences (\x5C),
          +    '|\\x5C[\\s\\S]'
          // or non-nesting character sets (\x5B\x5D);
          +    '|\\x5B(?:[^\\x5C\\x5D]|\\x5C[\\s\\S])*(?:\\x5D|$))+'
          // finally closed by a /.
          + '(?:/|$)');
      fallthroughStylePatterns.push(
          [PR_STRING, new RegExp(REGEX_LITERAL), REGEXP_PRECEDER_PATTERN]);
    }

    var keywords = wordSet(options.keywords);

    options = null;

    /** splits the given string into comment, string, and "other" tokens.
      * @param {string} sourceCode as plain text
      * @return {Array.<number|string>} a decoration list.
      * @private
      */
    var splitStringAndCommentTokens = createSimpleLexer(
        shortcutStylePatterns, fallthroughStylePatterns);

    var styleLiteralIdentifierPuncRecognizer = createSimpleLexer([], [
        [PR_PLAIN,       /^\s+/, null, ' \r\n'],
        // TODO(mikesamuel): recognize non-latin letters and numerals in idents
        [PR_PLAIN,       /^[a-z_$@][a-z_$@0-9]*/i, null],
        // A hex number
        [PR_LITERAL,     /^0x[a-f0-9]+[a-z]/i, null],
        // An octal or decimal number, possibly in scientific notation
        [PR_LITERAL,
         /^(?:\d(?:_\d+)*\d*(?:\.\d*)?|\.\d+)(?:e[+\-]?\d+)?[a-z]*/i,
         null, '123456789'],
        [PR_PUNCTUATION, /^[^\s\w\.$@]+/, null]
        // Fallback will handle decimal points not adjacent to a digit
      ]);

    /** splits plain text tokens into more specific tokens, and then tries to
      * recognize keywords, and types.
      * @private
      */
    function splitNonStringNonCommentTokens(source, decorations) {
      for (var i = 0; i < decorations.length; i += 2) {
        var style = decorations[i + 1];
        if (style === PR_PLAIN) {
          var start, end, chunk, subDecs;
          start = decorations[i];
          end = i + 2 < decorations.length ? decorations[i + 2] : source.length;
          chunk = source.substring(start, end);
          subDecs = styleLiteralIdentifierPuncRecognizer(chunk, start);
          for (var j = 0, m = subDecs.length; j < m; j += 2) {
            var subStyle = subDecs[j + 1];
            if (subStyle === PR_PLAIN) {
              var subStart = subDecs[j];
              var subEnd = j + 2 < m ? subDecs[j + 2] : chunk.length;
              var token = source.substring(subStart, subEnd);
              if (token === '.') {
                subDecs[j + 1] = PR_PUNCTUATION;
              } else if (token in keywords) {
                subDecs[j + 1] = PR_KEYWORD;
              } else if (/^@?[A-Z][A-Z$]*[a-z][A-Za-z$]*$/.test(token)) {
                // classify types and annotations using Java's style conventions
                subDecs[j + 1] = token.charAt(0) === '@' ? PR_LITERAL : PR_TYPE;
              }
            }
          }
          spliceArrayInto(subDecs, decorations, i, 2);
          i += subDecs.length - 2;
        }
      }
      return decorations;
    }

    return function (sourceCode) {
      // Split into strings, comments, and other.
      // We do this because strings and comments are easily recognizable and can
      // contain stuff that looks like other tokens, so we want to mark those
      // early so we don't recurse into them.
      var decorations = splitStringAndCommentTokens(sourceCode);

      // Split non comment|string tokens on whitespace and word boundaries
      decorations = splitNonStringNonCommentTokens(sourceCode, decorations);

      return decorations;
    };
  }

  var decorateSource = sourceDecorator({
        keywords: ALL_KEYWORDS,
        hashComments: true,
        cStyleComments: true,
        multiLineStrings: true,
        regexLiterals: true
      });

  /** identify regions of markup that are really source code, and recursivley
    * lex them.
    * @private
    */
  function splitSourceNodes(source, decorations) {
    for (var i = 0; i < decorations.length; i += 2) {
      var style = decorations[i + 1];
      if (style === PR_SOURCE) {
        // Recurse using the non-markup lexer
        var start, end;
        start = decorations[i];
        end = i + 2 < decorations.length ? decorations[i + 2] : source.length;
        var subDecorations = decorateSource(source.substring(start, end));
        for (var j = 0, m = subDecorations.length; j < m; j += 2) {
          subDecorations[j] += start;
        }
        spliceArrayInto(subDecorations, decorations, i, 2);
        i += subDecorations.length - 2;
      }
    }
    return decorations;
  }

  /** identify attribute values that really contain source code and recursively
    * lex them.
    * @private
    */
  function splitSourceAttributes(source, decorations) {
    var nextValueIsSource = false;
    for (var i = 0; i < decorations.length; i += 2) {
      var style = decorations[i + 1];
      var start, end;
      if (style === PR_ATTRIB_NAME) {
        start = decorations[i];
        end = i + 2 < decorations.length ? decorations[i + 2] : source.length;
        nextValueIsSource = /^on|^style$/i.test(source.substring(start, end));
      } else if (style === PR_ATTRIB_VALUE) {
        if (nextValueIsSource) {
          start = decorations[i];
          end = i + 2 < decorations.length ? decorations[i + 2] : source.length;
          var attribValue = source.substring(start, end);
          var attribLen = attribValue.length;
          var quoted =
              (attribLen >= 2 && /^[\"\']/.test(attribValue) &&
               attribValue.charAt(0) === attribValue.charAt(attribLen - 1));

          var attribSource;
          var attribSourceStart;
          var attribSourceEnd;
          if (quoted) {
            attribSourceStart = start + 1;
            attribSourceEnd = end - 1;
            attribSource = attribValue;
          } else {
            attribSourceStart = start + 1;
            attribSourceEnd = end - 1;
            attribSource = attribValue.substring(1, attribValue.length - 1);
          }

          var attribSourceDecorations = decorateSource(attribSource);
          for (var j = 0, m = attribSourceDecorations.length; j < m; j += 2) {
            attribSourceDecorations[j] += attribSourceStart;
          }

          if (quoted) {
            attribSourceDecorations.push(attribSourceEnd, PR_ATTRIB_VALUE);
            spliceArrayInto(attribSourceDecorations, decorations, i + 2, 0);
          } else {
            spliceArrayInto(attribSourceDecorations, decorations, i, 2);
          }
        }
        nextValueIsSource = false;
      }
    }
    return decorations;
  }

  /** returns a decoration list given a string of markup.
    *
    * This code recognizes a number of constructs.
    * <!-- ... --> comment
    * <!\w ... >   declaration
    * <\w ... >    tag
    * </\w ... >   tag
    * <?...?>      embedded source
    * <%...%>      embedded source
    * &[#\w]...;   entity
    *
    * It does not recognizes %foo; doctype entities from  .
    *
    * It will recurse into any <style>, <script>, and on* attributes using
    * PR_lexSource.
    */
  function decorateMarkup(sourceCode) {
    // This function works as follows:
    // 1) Start by splitting the markup into text and tag chunks
    //    Input:  string s
    //    Output: List<PR_Token> where style in (PR_PLAIN, null)
    // 2) Then split the text chunks further into comments, declarations,
    //    tags, etc.
    //    After each split, consider whether the token is the start of an
    //    embedded source section, i.e. is an open <script> tag.  If it is, find
    //    the corresponding close token, and don't bother to lex in between.
    //    Input:  List<string>
    //    Output: List<PR_Token> with style in
    //            (PR_TAG, PR_PLAIN, PR_SOURCE, null)
    // 3) Finally go over each tag token and split out attribute names and
    //    values.
    //    Input:  List<PR_Token>
    //    Output: List<PR_Token> where style in
    //            (PR_TAG, PR_PLAIN, PR_SOURCE, NAME, VALUE, null)
    var decorations = tokenizeMarkup(sourceCode);
    decorations = splitTagAttributes(sourceCode, decorations);
    decorations = splitSourceNodes(sourceCode, decorations);
    decorations = splitSourceAttributes(sourceCode, decorations);
    return decorations;
  }

  /**
    * @param {string} sourceText plain text
    * @param {Array.<number|string>} extractedTags chunks of raw html preceded
    *   by their position in sourceText in order.
    * @param {Array.<number|string>} decorations style classes preceded by their
    *   position in sourceText in order.
    * @return {string} html
    * @private
    */
  function recombineTagsAndDecorations(sourceText, extractedTags, decorations) {
    var html = [];
    // index past the last char in sourceText written to html
    var outputIdx = 0;

    var openDecoration = null;
    var currentDecoration = null;
    var tagPos = 0;  // index into extractedTags
    var decPos = 0;  // index into decorations
    var tabExpander = makeTabExpander(PR_TAB_WIDTH);

    var adjacentSpaceRe = /([\r\n ]) /g;
    var startOrSpaceRe = /(^| ) /gm;
    var newlineRe = /\r\n?|\n/g;
    var trailingSpaceRe = /[ \r\n]$/;
    var lastWasSpace = true;  // the last text chunk emitted ended with a space.
    
    // A helper function that is responsible for opening sections of decoration
    // and outputing properly escaped chunks of source
    function emitTextUpTo(sourceIdx) {
      if (sourceIdx > outputIdx) {
        if (openDecoration && openDecoration !== currentDecoration) {
          // Close the current decoration
          html.push('</span>');
          openDecoration = null;
        }
        if (!openDecoration && currentDecoration) {
          openDecoration = currentDecoration;
          html.push('<span class="', openDecoration, '">');
        }
        // This interacts badly with some wikis which introduces paragraph tags
        // into pre blocks for some strange reason.
        // It's necessary for IE though which seems to lose the preformattedness
        // of <pre> tags when their innerHTML is assigned.
        // http://stud3.tuwien.ac.at/~e0226430/innerHtmlQuirk.html
        // and it serves to undo the conversion of <br>s to newlines done in
        // chunkify.
        var htmlChunk = textToHtml(
            tabExpander(sourceText.substring(outputIdx, sourceIdx)))
            .replace(lastWasSpace
                     ? startOrSpaceRe
                     : adjacentSpaceRe, '$1&nbsp;');
        // Keep track of whether we need to escape space at the beginning of the
        // next chunk.
        lastWasSpace = trailingSpaceRe.test(htmlChunk);
        html.push(htmlChunk.replace(newlineRe, '<br />'));
        outputIdx = sourceIdx;
      }
    }

    while (true) {
      // Determine if we're going to consume a tag this time around.  Otherwise
      // we consume a decoration or exit.
      var outputTag;
      if (tagPos < extractedTags.length) {
        if (decPos < decorations.length) {
          // Pick one giving preference to extractedTags since we shouldn't open
          // a new style that we're going to have to immediately close in order
          // to output a tag.
          outputTag = extractedTags[tagPos] <= decorations[decPos];
        } else {
          outputTag = true;
        }
      } else {
        outputTag = false;
      }
      // Consume either a decoration or a tag or exit.
      if (outputTag) {
        emitTextUpTo(extractedTags[tagPos]);
        if (openDecoration) {
          // Close the current decoration
          html.push('</span>');
          openDecoration = null;
        }
        html.push(extractedTags[tagPos + 1]);
        tagPos += 2;
      } else if (decPos < decorations.length) {
        emitTextUpTo(decorations[decPos]);
        currentDecoration = decorations[decPos + 1];
        decPos += 2;
      } else {
        break;
      }
    }
    emitTextUpTo(sourceText.length);
    if (openDecoration) {
      html.push('</span>');
    }

    return html.join('');
  }

  /** Maps language-specific file extensions to handlers. */
  var langHandlerRegistry = {};
  /** Register a language handler for the given file extensions.
    * @param {function (string) : Array.<number|string>} handler
    *     a function from source code to a list of decorations.
    * @param {Array.<string>} fileExtensions
    */
  function registerLangHandler(handler, fileExtensions) {
    for (var i = fileExtensions.length; --i >= 0;) {
      var ext = fileExtensions[i];
      if (!langHandlerRegistry.hasOwnProperty(ext)) {
        langHandlerRegistry[ext] = handler;
      } else if ('console' in window) {
        console.log('cannot override language handler %s', ext);
      }
    }
  }
  registerLangHandler(decorateSource, ['default-code']);
  registerLangHandler(decorateMarkup,
                      ['default-markup', 'html', 'htm', 'xhtml', 'xml', 'xsl']);
  registerLangHandler(sourceDecorator({
          keywords: CPP_KEYWORDS,
          hashComments: true,
          cStyleComments: true
        }), ['c', 'cc', 'cpp', 'cs', 'cxx', 'cyc']);
  registerLangHandler(sourceDecorator({
          keywords: JAVA_KEYWORDS,
          cStyleComments: true
        }), ['java']);
  registerLangHandler(sourceDecorator({
          keywords: SH_KEYWORDS,
          hashComments: true,
          multiLineStrings: true
        }), ['bsh', 'csh', 'sh']);
  registerLangHandler(sourceDecorator({
          keywords: PYTHON_KEYWORDS,
          hashComments: true,
          multiLineStrings: true,
          tripleQuotedStrings: true
        }), ['cv', 'py']);
  registerLangHandler(sourceDecorator({
          keywords: PERL_KEYWORDS,
          hashComments: true,
          multiLineStrings: true,
          regexLiterals: true
        }), ['perl', 'pl', 'pm']);
  registerLangHandler(sourceDecorator({
          keywords: RUBY_KEYWORDS,
          hashComments: true,
          multiLineStrings: true,
          regexLiterals: true
        }), ['rb']);
  registerLangHandler(sourceDecorator({
          keywords: JSCRIPT_KEYWORDS,
          cStyleComments: true,
          regexLiterals: true
        }), ['js']);

  function prettyPrintOne(sourceCodeHtml, opt_langExtension) {
    try {
      // Extract tags, and convert the source code to plain text.
      var sourceAndExtractedTags = extractTags(sourceCodeHtml);
      /** Plain text. @type {string} */
      var source = sourceAndExtractedTags.source;

      /** Even entries are positions in source in ascending order.  Odd entries
        * are tags that were extracted at that position.
        * @type {Array.<number|string>}
        */
      var extractedTags = sourceAndExtractedTags.tags;

      // Pick a lexer and apply it.
      if (!langHandlerRegistry.hasOwnProperty(opt_langExtension)) {
        // Treat it as markup if the first non whitespace character is a < and
        // the last non-whitespace character is a >.
        opt_langExtension =
            /^\s*</.test(source) ? 'default-markup' : 'default-code';
      }

      /** Even entries are positions in source in ascending order.  Odd enties
        * are style markers (e.g., PR_COMMENT) that run from that position until
        * the end.
        * @type {Array.<number|string>}
        */
      var decorations = langHandlerRegistry[opt_langExtension].call({}, source);

      // Integrate the decorations and tags back into the source code to produce
      // a decorated html string.
      return recombineTagsAndDecorations(source, extractedTags, decorations);
    } catch (e) {
      if ('console' in window) {
        console.log(e);
        console.trace();
      }
      return sourceCodeHtml;
    }
  }

  function prettyPrint(opt_whenDone) {
    var isIE6 = _pr_isIE6();

    // fetch a list of nodes to rewrite
    var codeSegments = [
        document.getElementsByTagName('pre'),
        document.getElementsByTagName('code'),
        document.getElementsByTagName('xmp') ];
    var elements = [];
    for (var i = 0; i < codeSegments.length; ++i) {
      for (var j = 0; j < codeSegments[i].length; ++j) {
        elements.push(codeSegments[i][j]);
      }
    }
    codeSegments = null;

    // the loop is broken into a series of continuations to make sure that we
    // don't make the browser unresponsive when rewriting a large page.
    var k = 0;

    function doWork() {
      var endTime = (PR_SHOULD_USE_CONTINUATION ?
                     new Date().getTime() + 250 /* ms */ :
                     Infinity);
      for (; k < elements.length && new Date().getTime() < endTime; k++) {
        var cs = elements[k];
        if (cs.className && cs.className.indexOf('prettyprint') >= 0) {
          // If the classes includes a language extensions, use it.
          // Language extensions can be specified like
          //     <pre class="prettyprint lang-cpp">
          // the language extension "cpp" is used to find a language handler as
          // passed to PR_registerLangHandler.
          var langExtension = cs.className.match(/\blang-(\w+)\b/);
          if (langExtension) { langExtension = langExtension[1]; }

          // make sure this is not nested in an already prettified element
          var nested = false;
          for (var p = cs.parentNode; p; p = p.parentNode) {
            if ((p.tagName === 'pre' || p.tagName === 'code' ||
                 p.tagName === 'xmp') &&
                p.className && p.className.indexOf('prettyprint') >= 0) {
              nested = true;
              break;
            }
          }
          if (!nested) {
            // fetch the content as a snippet of properly escaped HTML.
            // Firefox adds newlines at the end.
            var content = getInnerHtml(cs);
            content = content.replace(/(?:\r\n?|\n)$/, '');

            // do the pretty printing
            var newContent = prettyPrintOne(content, langExtension);

            // push the prettified html back into the tag.
            if (!isRawContent(cs)) {
              // just replace the old html with the new
              cs.innerHTML = newContent;
            } else {
              // we need to change the tag to a <pre> since <xmp>s do not allow
              // embedded tags such as the span tags used to attach styles to
              // sections of source code.
              var pre = document.createElement('PRE');
              for (var i = 0; i < cs.attributes.length; ++i) {
                var a = cs.attributes[i];
                if (a.specified) {
                  var aname = a.name.toLowerCase();
                  if (aname === 'class') {
                    pre.className = a.value;  // For IE 6
                  } else {
                    pre.setAttribute(a.name, a.value);
                  }
                }
              }
              pre.innerHTML = newContent;

              // remove the old
              cs.parentNode.replaceChild(pre, cs);
              cs = pre;
            }

            // Replace <br>s with line-feeds so that copying and pasting works
            // on IE 6.
            // Doing this on other browsers breaks lots of stuff since \r\n is
            // treated as two newlines on Firefox, and doing this also slows
            // down rendering.
            if (isIE6 && cs.tagName === 'PRE') {
              var lineBreaks = cs.getElementsByTagName('br');
              for (var j = lineBreaks.length; --j >= 0;) {
                var lineBreak = lineBreaks[j];
                lineBreak.parentNode.replaceChild(
                    document.createTextNode('\r\n'), lineBreak);
              }
            }
          }
        }
      }
      if (k < elements.length) {
        // finish up in a continuation
        setTimeout(doWork, 250);
      } else if (opt_whenDone) {
        opt_whenDone();
      }
    }

    doWork();
  }

  window['PR_normalizedHtml'] = normalizedHtml;
  window['prettyPrintOne'] = prettyPrintOne;
  window['prettyPrint'] = prettyPrint;
  window['PR'] = {
        'createSimpleLexer': createSimpleLexer,
        'registerLangHandler': registerLangHandler,
        'sourceDecorator': sourceDecorator,
        'PR_ATTRIB_NAME': PR_ATTRIB_NAME,
        'PR_ATTRIB_VALUE': PR_ATTRIB_VALUE,
        'PR_COMMENT': PR_COMMENT,
        'PR_DECLARATION': PR_DECLARATION,
        'PR_KEYWORD': PR_KEYWORD,
        'PR_LITERAL': PR_LITERAL,
        'PR_NOCODE': PR_NOCODE,
        'PR_PLAIN': PR_PLAIN,
        'PR_PUNCTUATION': PR_PUNCTUATION,
        'PR_SOURCE': PR_SOURCE,
        'PR_STRING': PR_STRING,
        'PR_TAG': PR_TAG,
        'PR_TYPE': PR_TYPE
      };
})();

$.fn.fadeSlideIn = function(speed) {
	$(this).animate({
	    height: 'show',
	    opacity: 'show'
	}, speed); 
};

$.fn.fadeSlideOut = function(speed) {
	$(this).animate({
	    height: 'hide',
	    opacity: 'hide'
	}, speed); 
};

$.fn.ajaxPost = function(target, action, preaction) {
	$(this).live('submit', function() {
		if ($.isFunction(preaction)) {
			preaction();
		};
		
		var form = $(this);
		var data = '';
		var first = true;
		
		$(this).find('input, textarea').each(function() {
			var name = $(this).attr('name');
			if (name != '') {
				if (first) {
					first = false;
				} else {
					data = data + '&';
				}
				var value = $(this).val();
			
				data = data + name + '=' + encodeURIComponent(value);
			}
		});

		$.post(target, data, action);
		return false;
	});
};

$.fn.submitAjax = function(target, action, preaction) {
	$(this).each(function() {
		if ($.isFunction(preaction)) {
			preaction();
		};
		
		var form = $(this);
		var data = '';
		var first = true;
		
		var wmdForm = $(this).find('#wmd-input').length > 0;
		
		$(this).find('input ' + (wmdForm ? '' : ' textarea')).each(function() {
			var name = $(this).attr('name');
			if (name != '') {
				if (first) {
					first = false;
				} else {
					data = data + '&';
				}
				var value = $(this).val();
			
				data = data + name + '=' + encodeURIComponent(value);
			}
		});


		if (wmdForm) {
			var body = encodeURIComponent($(this).find('#wmd-input').attr('value'));	
			var html = encodeURIComponent($(this).find('#wmd-preview').html());
			
			if (data.length == 0) {
				data = data + '?';
			} else {
				data = data + '&';
			}
			data = data + 'Body=' + body + '&Html=' + html;
		}
		
		$.post(target, data, action);
		return false;
	});
};


$.fn.showError = function(data) {
	$(this).find('.PostBoxError').hide().html(data).fadeIn('medium');
	$(this).find('.PostBoxProgress').fadeOut('medium');
};

$.fn.showProgress = function(data) {
	$(this).find('.PostBoxError').fadeSlideOut('medium');
	$(this).find('.PostBoxProgress').fadeIn('medium');
};

$.fn.niceForm = function() {
	var form = $(this);
	form.find('input, textarea').keydown(function() {
		form.find('.PostBoxError').fadeOut('slow');
	});
};


$.fn.selectText = function(start, end) {
	var field = $(this);
	
	if (field.createTextRange) {
		var selRange = field.createTextRange();
		selRange.collapse(true);
		selRange.moveStart("character", start);
		selRange.moveEnd("character", end - start);
		selRange.select();
	} else if (field.setSelectionRange) {
		field.setSelectionRange(start, end);
	} else {
		if (field.selectionStart) {
			field.selectionStart = start;
			field.selectionEnd = end;
		}
	}
	
	field.focus();
};
;(function($) {

function replyForm() {
	$('#ReplyForm input, #ReplyForm textarea').live('keydown', function() {
		$('.ReplyBox .PostBoxError').fadeOut('slow');
	});
	
	$('#ReplyForm').live('submit', function() {
		$('.ReplyBox').showProgress();
		
		var name = encodeURIComponent($(this).find('#Name').attr('value'));
		var mail = encodeURIComponent($(this).find('#Whale').attr('value'));	
		var website = encodeURIComponent($(this).find('#Website').attr('value'));	
		var body = encodeURIComponent($(this).find('#wmd-input').attr('value'));	
		var html = encodeURIComponent($(this).find('#wmd-preview').html());	
		
		var octopus = $('.Octopus').attr('id').substring(9);
		var lobster = encodeURIComponent(octopus);
		
		var query = 'Name=' + name + '&Whale=' + mail + '&Website=' + website + '&Body=' + body 
					+ '&Html=' + html + '&Lobster=' + lobster;

		$.post('' + window.location, query, function(data) {
			if ('true' == data) {
				window.location.reload();
			} else {
				if (data == '') {
					data = 'Post Failed';
				}
				$('.ReplyBox').showError('<div class="ErrorMessage">' + data + '</div>');
			}
		});

		return false;
	});
}

function postForm() {
}

function postQuestionForm() {
	$('#PostQuestionForm').live('submit', function() {
		
		$('#PostQuestionForm').submitAjax('/post/question', function(data) {
			if ('true' == data) {
				window.location.reload();
			} else {
				$('#AjaxErrors').html('<div class="ErrorMessage">' + data + '</div>');
			}			
		});
		
		return false;
	});
	
	postQuestionFormSuggest();
}
	
function postQuestionFormSuggest() {
	function suggest() {
		$.get('/discuss/suggest/' + encodeURIComponent($('#Subject').val()), function(data) {
			if (data == '') {
				$('#PostSearchResults').fadeOut('slow');
			} else {
				$('#PostSearchResults').hide()
				.html(data)
				.animate({opacity: 'show', height: 'show'}, 1500);
			}
		});
	}
	
	var timer;
	
	$('#Subject').live('keydown', function() {
		clearTimeout(timer);
		timer = setTimeout(suggest, 2000);
	});
}


function openIdForm() {
	$('.OpenIdLarge a').live('click', function() {
		var path = $(this).attr('href');
	    var field = $('#openid_url');
	    var index = path.indexOf('@');
	    
	    path = path.replace(/@/g, "username");
	    field.val(path);

	    if (index > 0) {
	    	field.selectText(index, index + 8);
	    } else {
	    	field.focus();
	    }
	    
	    return false;
	});	
}

function questionFormLink() {
	$('#PostQuestionForm input, #PostQuestionForm textarea').live('keydown', function() {
		$('.ReplyBox .PostBoxError').fadeOut('slow');
	});	
	
	$('#PostQuestion').live('click', function() {
		if ($('#Username').length > 0) {
			$('#PostQuestionProgress').fadeIn('medium');
			
			$.get('/post/question', function(data) {
				$('.RepliesPart').hide().html(data).fadeIn('slow');
				$('textarea.resizable:not(.processed)').TextAreaResizer();
				if ($('#wmd-input').length > 0) {
					$.wmd();
				}
			});
		} else {
			$.dialog.open('/login');
		}
		return false;
	});
}


function meForm() {
	$('#PersonForm').ajaxPost('/users/me', function() {
		$.dialog.close();
		return false;
	}, function() {
		$('.MeBox').showProgress();
	});
}


$.forms = function() {
	replyForm();
	postForm();
	postQuestionForm();
	openIdForm();
	questionFormLink();
	meForm();
}

})(jQuery);
;(function($) {
	
var overlay = $('<div class="Dialog-overlay"></div>');
var dialog = $('<div class="Dialog-frame"><a class="Dialog-close" href="#"></a><div class="Dialog-content"></div></div>');	
var progress = '<div class="Dialog-progress"></div>';
var timeout;

function trigger(events, name) {
	if (events != null && name in events) {
		events[name]();
//	} else if (alt != null) {
//		$(document).trigger(alt);
	}
}

function showProgress() {
	if (!dialog.is(":visible")) {
		dialog.find('.Dialog-close').hide();
		dialog.find('.Dialog-content').html(progress);
	
		dialog
		.css('margin-left', -(dialog.width() / 2))
		.css('margin-top', -(dialog.height() / 2))
		;
		
		dialog.fadeIn('fast');
	}
}

$.dialog = {};

$.dialog.options = {};

$.dialog.close = function() {
	dialog.fadeOut('fast', function() {
		overlay.hide();
	});
}

$.dialog.show = function(data, events) {
	$(overlay).show();

	dialog.find('.Dialog-content').html(data);

	dialog
	.css('margin-left', -(dialog.width() / 2))
	.css('margin-top', -(dialog.height() / 2))
	;
	
	dialog.fadeIn('fast');
	trigger(events, 'open');
}

$.dialog.open = function(link, events) {
	$(overlay).show();
	clearTimeout(timeout);
	timeout = setTimeout(showProgress, 500);
	
	$.get(link, function(data) {
		dialog.hide();
		dialog.find('.Dialog-content').html(data);
		dialog.find('.Dialog-close').show();

		dialog
		.css('margin-left', -(dialog.width() / 2))
		.css('margin-top', -(dialog.height() / 2))
		;
		
		dialog.fadeIn('fast');
		trigger(events, 'open');
	});
}


$.fn.dialog = function(events) {
	$(this).live('click', function() {
		var link = $(this).attr('href');
		
		$.dialog.open(link, events);
		
		return false;
	})
}

$(document).ready(function() {
	$(overlay).appendTo($('body')).hide()
	.css('z-index', '1000')
	.css('position', 'fixed')
	.css('width', '100%')
	.css('height', '100%')
	.css('left', '0px')
	.css('top', '0px')
	;
	
	$(dialog).appendTo($('body')).hide()
	.css('position', 'fixed')
	.css('z-index', '1001')
	.css('left', '50%')
	.css('top', '40%')
	;
	
	$(dialog).find('.Dialog-close').click(function() {
		$.dialog.close();
		return false;
	});
	
	$(document).bind('keydown', function(event) {
		if (event.keyCode == 27 && dialog.is(':visible')) {
			$.dialog.close();
		}
	});
});

})(jQuery);
;(function($) {

function rootArticle() {
	$('.ArticleOptionsAction').live('click', function() {
		var link = $(this).attr('href');
		var id = link.substring(link.lastIndexOf('/') + 1);
		var panel = $('#ArticleOptions-' + id);
		if (panel.is(':visible')) {
			panel.fadeOut('medium');
		} else {
			panel.fadeIn('slow');
		}
		
		return false;
	});
	
	$('.ArticleOptions a').live('click', function() {
		var link = $(this).attr('href');
		
		if ($(this).hasClass('Edit')) {
			window.location = link;
		} else {
			$.post(link, function() {
				window.location.reload();
			});
		}
		
		return false;
	});
	
}	

function sideShareArticle() {
	var action = false;
	if ($('.ShareFloatContent').length > 0) {
		function handler () {
			var share = $('.ShareFloatContent');
			var article = $('.CenterContainer');
			var articleOffset = $('.CenterContainer').offset();
			var center = $('.CenterContainer');
			
			if ($(window).scrollTop() > articleOffset.top) {// && $(window).scrollTop() < (articleOffset.top + article.height())) {
				if (action) {
					share.css('top', '20px');
				}
				action = false;
			} else {
				share.css('top', '' + (articleOffset.top - $(window).scrollTop()) + 'px');
				action = true;
			}
		};
		
		$(document).scroll(handler);
		handler();
	}
}

function animal() {
	$('.AnimalBox')
	.mouseenter(function() {
		var image = $('.AnimalBox img');
		if (image.attr('src') == '#') {
			image.load(function() {
				image.animate({'top': 0}, 1000);
			});
			
			image.attr('src', '/images/gremlin.png');
		} else {
			$('.AnimalBox img').stop(true);
			image.animate({'top': 0}, 1000);
		}
	})
	.mouseleave(function() {
		$('.AnimalBox img').stop(true);
		$('.AnimalBox img').animate({'top': 80}, 400);
	})
	;
}

$(document).ready(function() {
	prettyPrint();
	rootArticle();
	sideShareArticle();
	animal();
	
	$('.ContactLink').attr('href', ('mai' + 'ltoRmanuel'.replace('R', ':') + '@' + 'codegremlins.com'));
	
	if ($('#wmd-input').length > 0) {
		$.wmd();
	}
	
	$('#LoginButton').dialog({open: function() {
		$('#openid_url').focus();
	}});
	$('.PopupLink').dialog({open: function() {
		$('.Dialog-content input:first').focus();
	}});
	$.forms();
	
	$('.ReplyContainer').load('/0/reply', function() {
		$('textarea.resizable:not(.processed)').TextAreaResizer();
	}).fadeIn('slow', function() {$.wmd();});
	
	$('textarea.resizable:not(.processed)').TextAreaResizer();
});
})(jQuery);
(function($){var textarea,staticOffset;var iLastMousePos=0;var iMin=32;var grip;$.fn.TextAreaResizer=function(){return this.each(function(){textarea=$(this).addClass('processed'),staticOffset=null;$(this).wrap('<div class="resizable-textarea"><span></span></div>').parent().append($('<div class="grippie"></div>').bind("mousedown",{el:this},startDrag));var grippie=$('div.grippie',$(this).parent())[0];grippie.style.marginRight=(grippie.offsetWidth-$(this)[0].offsetWidth)+'px'})};function startDrag(e){textarea=$(e.data.el);textarea.blur();iLastMousePos=mousePosition(e).y;staticOffset=textarea.height()-iLastMousePos;textarea.css('opacity',0.25);$(document).mousemove(performDrag).mouseup(endDrag);return false}function performDrag(e){var iThisMousePos=mousePosition(e).y;var iMousePos=staticOffset+iThisMousePos;if(iLastMousePos>=(iThisMousePos)){iMousePos-=5}iLastMousePos=iThisMousePos;iMousePos=Math.max(iMin,iMousePos);textarea.height(iMousePos+'px');if(iMousePos<iMin){endDrag(e)}return false}function endDrag(e){$(document).unbind('mousemove',performDrag).unbind('mouseup',endDrag);textarea.css('opacity',1);textarea.focus();textarea=null;staticOffset=null;iLastMousePos=0}function mousePosition(e){return{x:e.clientX+document.documentElement.scrollLeft,y:e.clientY+document.documentElement.scrollTop}}})(jQuery);
//
// showdown.js -- A javascript port of Markdown.
//
// Copyright (c) 2007 John Fraser.
//
// Original Markdown Copyright (c) 2004-2005 John Gruber
//   <http://daringfireball.net/projects/markdown/>
//
// The full source distribution is at:
//
//				A A L
//				T C A
//				T K B
//
//   <http://www.attacklab.net/>
//

//
// Wherever possible, Showdown is a straight, line-by-line port
// of the Perl version of Markdown.
//
// This is not a normal parser design; it's basically just a
// series of string substitutions.  It's hard to read and
// maintain this way,  but keeping Showdown close to the original
// design makes it easier to port new features.
//
// More importantly, Showdown behaves like markdown.pl in most
// edge cases.  So web applications can do client-side preview
// in Javascript, and then build identical HTML on the server.
//
// This port needs the new RegExp functionality of ECMA 262,
// 3rd Edition (i.e. Javascript 1.5).  Most modern web browsers
// should do fine.  Even with the new regular expression features,
// We do a lot of work to emulate Perl's regex functionality.
// The tricky changes in this file mostly have the "attacklab:"
// label.  Major or self-explanatory changes don't.
//
// Smart diff tools like Araxis Merge will be able to match up
// this file with markdown.pl in a useful way.  A little tweaking
// helps: in a copy of markdown.pl, replace "#" with "//" and
// replace "$text" with "text".  Be sure to ignore whitespace
// and line endings.
//


//
// Showdown usage:
//
//   var text = "Markdown *rocks*.";
//
//   var converter = new Attacklab.showdown.converter();
//   var html = converter.makeHtml(text);
//
//   alert(html);
//
// Note: move the sample code to the bottom of this
// file before uncommenting it.
//


//
// Attacklab namespace
//
var Attacklab = Attacklab || {}

//
// Showdown namespace
//
Attacklab.showdown = Attacklab.showdown || {}

//
// converter
//
// Wraps all "globals" so that the only thing
// exposed is makeHtml().
//
Attacklab.showdown.converter = function() {

//
// Globals:
//

// Global hashes, used by various utility routines
var g_urls;
var g_titles;
var g_html_blocks;

// Used to track when we're inside an ordered or unordered list
// (see _ProcessListItems() for details):
var g_list_level = 0;


this.makeHtml = function(text) {
//
// Main function. The order in which other subs are called here is
// essential. Link and image substitutions need to happen before
// _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the <a>
// and <img> tags get encoded.
//

	// Clear the global hashes. If we don't clear these, you get conflicts
	// from other articles when generating a page which contains more than
	// one article (e.g. an index page that shows the N most recent
	// articles):
	g_urls = new Array();
	g_titles = new Array();
	g_html_blocks = new Array();

	// attacklab: Replace ~ with ~T
	// This lets us use tilde as an escape char to avoid md5 hashes
	// The choice of character is arbitray; anything that isn't
    // magic in Markdown will work.
	text = text.replace(/~/g,"~T");

	// attacklab: Replace $ with ~D
	// RegExp interprets $ as a special character
	// when it's in a replacement string
	text = text.replace(/\$/g,"~D");

	// Standardize line endings
	text = text.replace(/\r\n/g,"\n"); // DOS to Unix
	text = text.replace(/\r/g,"\n"); // Mac to Unix

	// Make sure text begins and ends with a couple of newlines:
	text = "\n\n" + text + "\n\n";

	// Convert all tabs to spaces.
	text = _Detab(text);

	// Strip any lines consisting only of spaces and tabs.
	// This makes subsequent regexen easier to write, because we can
	// match consecutive blank lines with /\n+/ instead of something
	// contorted like /[ \t]*\n+/ .
	text = text.replace(/^[ \t]+$/mg,"");

	// Turn block-level HTML blocks into hash entries
	text = _HashHTMLBlocks(text);

	// Strip link definitions, store in hashes.
	text = _StripLinkDefinitions(text);

	text = _RunBlockGamut(text);

	text = _UnescapeSpecialChars(text);

	// attacklab: Restore dollar signs
	text = text.replace(/~D/g,"$$");

	// attacklab: Restore tildes
	text = text.replace(/~T/g,"~");

	return text;
}

var _StripLinkDefinitions = function(text) {
//
// Strips link definitions from text, stores the URLs and titles in
// hash references.
//

	// Link defs are in the form: ^[id]: url "optional title"

	/*
		var text = text.replace(/
				^[ ]{0,3}\[(.+)\]:  // id = $1  attacklab: g_tab_width - 1
				  [ \t]*
				  \n?				// maybe *one* newline
				  [ \t]*
				<?(\S+?)>?			// url = $2
				  [ \t]*
				  \n?				// maybe one newline
				  [ \t]*
				(?:
				  (\n*)				// any lines skipped = $3 attacklab: lookbehind removed
				  ["(]
				  (.+?)				// title = $4
				  [")]
				  [ \t]*
				)?					// title is optional
				(?:\n+|$)
			  /gm,
			  function(){...});
	*/
	var text = text.replace(/^[ ]{0,3}\[(.+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+)/gm,
		function (wholeMatch,m1,m2,m3,m4) {
			m1 = m1.toLowerCase();
			g_urls[m1] = _EncodeAmpsAndAngles(m2);  // Link IDs are case-insensitive
			if (m3) {
				// Oops, found blank lines, so it's not a title.
				// Put back the parenthetical statement we stole.
				return m3+m4;
			} else if (m4) {
				g_titles[m1] = m4.replace(/"/g,"&quot;");
			}
			
			// Completely remove the definition from the text
			return "";
		}
	);

	return text;
}

var _HashHTMLBlocks = function(text) {
	// attacklab: Double up blank lines to reduce lookaround
	text = text.replace(/\n/g,"\n\n");

	// Hashify HTML blocks:
	// We only want to do this for block-level HTML tags, such as headers,
	// lists, and tables. That's because we still want to wrap <p>s around
	// "paragraphs" that are wrapped in non-block-level tags, such as anchors,
	// phrase emphasis, and spans. The list of tags we're looking for is
	// hard-coded:
	var block_tags_a = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del"
	var block_tags_b = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math"

	// First, look for nested blocks, e.g.:
	//   <div>
	//     <div>
	//     tags for inner block must be indented.
	//     </div>
	//   </div>
	//
	// The outermost tags must start at the left margin for this to match, and
	// the inner nested divs must be indented.
	// We need to do this before the next, more liberal match, because the next
	// match will start at the first `<div>` and stop at the first `</div>`.

	// attacklab: This regex can be expensive when it fails.
	/*
		var text = text.replace(/
		(						// save in $1
			^					// start of line  (with /m)
			<($block_tags_a)	// start tag = $2
			\b					// word break
								// attacklab: hack around khtml/pcre bug...
			[^\r]*?\n			// any number of lines, minimally matching
			</\2>				// the matching end tag
			[ \t]*				// trailing spaces/tabs
			(?=\n+)				// followed by a newline
		)						// attacklab: there are sentinel newlines at end of document
		/gm,function(){...}};
	*/
	text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del)\b[^\r]*?\n<\/\2>[ \t]*(?=\n+))/gm,hashElement);

	//
	// Now match more liberally, simply from `\n<tag>` to `</tag>\n`
	//

	/*
		var text = text.replace(/
		(						// save in $1
			^					// start of line  (with /m)
			<($block_tags_b)	// start tag = $2
			\b					// word break
								// attacklab: hack around khtml/pcre bug...
			[^\r]*?				// any number of lines, minimally matching
			.*</\2>				// the matching end tag
			[ \t]*				// trailing spaces/tabs
			(?=\n+)				// followed by a newline
		)						// attacklab: there are sentinel newlines at end of document
		/gm,function(){...}};
	*/
	text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math)\b[^\r]*?.*<\/\2>[ \t]*(?=\n+)\n)/gm,hashElement);

	// Special case just for <hr />. It was easier to make a special case than
	// to make the other regex more complicated.  

	/*
		text = text.replace(/
		(						// save in $1
			\n\n				// Starting after a blank line
			[ ]{0,3}
			(<(hr)				// start tag = $2
			\b					// word break
			([^<>])*?			// 
			\/?>)				// the matching end tag
			[ \t]*
			(?=\n{2,})			// followed by a blank line
		)
		/g,hashElement);
	*/
	text = text.replace(/(\n[ ]{0,3}(<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g,hashElement);

	// Special case for standalone HTML comments:

	/*
		text = text.replace(/
		(						// save in $1
			\n\n				// Starting after a blank line
			[ ]{0,3}			// attacklab: g_tab_width - 1
			<!
			(--[^\r]*?--\s*)+
			>
			[ \t]*
			(?=\n{2,})			// followed by a blank line
		)
		/g,hashElement);
	*/
	text = text.replace(/(\n\n[ ]{0,3}<!(--[^\r]*?--\s*)+>[ \t]*(?=\n{2,}))/g,hashElement);

	// PHP and ASP-style processor instructions (<?...?> and <%...%>)

	/*
		text = text.replace(/
		(?:
			\n\n				// Starting after a blank line
		)
		(						// save in $1
			[ ]{0,3}			// attacklab: g_tab_width - 1
			(?:
				<([?%])			// $2
				[^\r]*?
				\2>
			)
			[ \t]*
			(?=\n{2,})			// followed by a blank line
		)
		/g,hashElement);
	*/
	text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g,hashElement);

	// attacklab: Undo double lines (see comment at top of this function)
	text = text.replace(/\n\n/g,"\n");
	return text;
}

var hashElement = function(wholeMatch,m1) {
	var blockText = m1;

	// Undo double lines
	blockText = blockText.replace(/\n\n/g,"\n");
	blockText = blockText.replace(/^\n/,"");
	
	// strip trailing blank lines
	blockText = blockText.replace(/\n+$/g,"");
	
	// Replace the element text with a marker ("~KxK" where x is its key)
	blockText = "\n\n~K" + (g_html_blocks.push(blockText)-1) + "K\n\n";
	
	return blockText;
};

var _RunBlockGamut = function(text) {
//
// These are all the transformations that form block-level
// tags like paragraphs, headers, and list items.
//
	text = _DoHeaders(text);

	// Do Horizontal Rules:
	var key = hashBlock("<hr />");
	text = text.replace(/^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$/gm,key);
	text = text.replace(/^[ ]{0,2}([ ]?-[ ]?){3,}[ \t]*$/gm,key);
	text = text.replace(/^[ ]{0,2}([ ]?_[ ]?){3,}[ \t]*$/gm,key);

	text = _DoLists(text);
	text = _DoCodeBlocks(text);
	text = _DoBlockQuotes(text);

	// We already ran _HashHTMLBlocks() before, in Markdown(), but that
	// was to escape raw HTML in the original Markdown source. This time,
	// we're escaping the markup we've just created, so that we don't wrap
	// <p> tags around block-level tags.
	text = _HashHTMLBlocks(text);
	text = _FormParagraphs(text);

	return text;
}


var _RunSpanGamut = function(text) {
//
// These are all the transformations that occur *within* block-level
// tags like paragraphs, headers, and list items.
//

	text = _DoCodeSpans(text);
	text = _EscapeSpecialCharsWithinTagAttributes(text);
	text = _EncodeBackslashEscapes(text);

	// Process anchor and image tags. Images must come first,
	// because ![foo][f] looks like an anchor.
	text = _DoImages(text);
	text = _DoAnchors(text);

	// Make links out of things like `<http://example.com/>`
	// Must come after _DoAnchors(), because you can use < and >
	// delimiters in inline links like [this](<url>).
	text = _DoAutoLinks(text);
	text = _EncodeAmpsAndAngles(text);
	text = _DoItalicsAndBold(text);

	// Do hard breaks:
	text = text.replace(/  +\n/g," <br />\n");

	return text;
}

var _EscapeSpecialCharsWithinTagAttributes = function(text) {
//
// Within tags -- meaning between < and > -- encode [\ ` * _] so they
// don't conflict with their use in Markdown for code, italics and strong.
//

	// Build a regex to find HTML tags and comments.  See Friedl's 
	// "Mastering Regular Expressions", 2nd Ed., pp. 200-201.
	var regex = /(<[a-z\/!$]("[^"]*"|'[^']*'|[^'">])*>|<!(--.*?--\s*)+>)/gi;

	text = text.replace(regex, function(wholeMatch) {
		var tag = wholeMatch.replace(/(.)<\/?code>(?=.)/g,"$1`");
		tag = escapeCharacters(tag,"\\`*_");
		return tag;
	});

	return text;
}

var _DoAnchors = function(text) {
//
// Turn Markdown link shortcuts into XHTML <a> tags.
//
	//
	// First, handle reference-style links: [link text] [id]
	//

	/*
		text = text.replace(/
		(							// wrap whole match in $1
			\[
			(
				(?:
					\[[^\]]*\]		// allow brackets nested one level
					|
					[^\[]			// or anything else
				)*
			)
			\]

			[ ]?					// one optional space
			(?:\n[ ]*)?				// one optional newline followed by spaces

			\[
			(.*?)					// id = $3
			\]
		)()()()()					// pad remaining backreferences
		/g,_DoAnchors_callback);
	*/
	text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g,writeAnchorTag);

	//
	// Next, inline-style links: [link text](url "optional title")
	//

	/*
		text = text.replace(/
			(						// wrap whole match in $1
				\[
				(
					(?:
						\[[^\]]*\]	// allow brackets nested one level
					|
					[^\[\]]			// or anything else
				)
			)
			\]
			\(						// literal paren
			[ \t]*
			()						// no id, so leave $3 empty
			<?(.*?)>?				// href = $4
			[ \t]*
			(						// $5
				(['"])				// quote char = $6
				(.*?)				// Title = $7
				\6					// matching quote
				[ \t]*				// ignore any spaces/tabs between closing quote and )
			)?						// title is optional
			\)
		)
		/g,writeAnchorTag);
	*/
	text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\]\([ \t]*()<?(.*?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,writeAnchorTag);

	//
	// Last, handle reference-style shortcuts: [link text]
	// These must come last in case you've also got [link test][1]
	// or [link test](/foo)
	//

	/*
		text = text.replace(/
		(		 					// wrap whole match in $1
			\[
			([^\[\]]+)				// link text = $2; can't contain '[' or ']'
			\]
		)()()()()()					// pad rest of backreferences
		/g, writeAnchorTag);
	*/
	text = text.replace(/(\[([^\[\]]+)\])()()()()()/g, writeAnchorTag);

	return text;
}

var writeAnchorTag = function(wholeMatch,m1,m2,m3,m4,m5,m6,m7) {
	if (m7 == undefined) m7 = "";
	var whole_match = m1;
	var link_text   = m2;
	var link_id	 = m3.toLowerCase();
	var url		= m4;
	var title	= m7;
	
	if (url == "") {
		if (link_id == "") {
			// lower-case and turn embedded newlines into spaces
			link_id = link_text.toLowerCase().replace(/ ?\n/g," ");
		}
		url = "#"+link_id;
		
		if (g_urls[link_id] != undefined) {
			url = g_urls[link_id];
			if (g_titles[link_id] != undefined) {
				title = g_titles[link_id];
			}
		}
		else {
			if (whole_match.search(/\(\s*\)$/m)>-1) {
				// Special case for explicit empty url
				url = "";
			} else {
				return whole_match;
			}
		}
	}	
	
	url = escapeCharacters(url,"*_");
	var result = "<a href=\"" + url + "\"";
	
	if (title != "") {
		title = title.replace(/"/g,"&quot;");
		title = escapeCharacters(title,"*_");
		result +=  " title=\"" + title + "\"";
	}
	
	result += ">" + link_text + "</a>";
	
	return result;
}


var _DoImages = function(text) {
//
// Turn Markdown image shortcuts into <img> tags.
//

	//
	// First, handle reference-style labeled images: ![alt text][id]
	//

	/*
		text = text.replace(/
		(						// wrap whole match in $1
			!\[
			(.*?)				// alt text = $2
			\]

			[ ]?				// one optional space
			(?:\n[ ]*)?			// one optional newline followed by spaces

			\[
			(.*?)				// id = $3
			\]
		)()()()()				// pad rest of backreferences
		/g,writeImageTag);
	*/
	text = text.replace(/(!\[(.*?)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g,writeImageTag);

	//
	// Next, handle inline images:  ![alt text](url "optional title")
	// Don't forget: encode * and _

	/*
		text = text.replace(/
		(						// wrap whole match in $1
			!\[
			(.*?)				// alt text = $2
			\]
			\s?					// One optional whitespace character
			\(					// literal paren
			[ \t]*
			()					// no id, so leave $3 empty
			<?(\S+?)>?			// src url = $4
			[ \t]*
			(					// $5
				(['"])			// quote char = $6
				(.*?)			// title = $7
				\6				// matching quote
				[ \t]*
			)?					// title is optional
		\)
		)
		/g,writeImageTag);
	*/
	text = text.replace(/(!\[(.*?)\]\s?\([ \t]*()<?(\S+?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,writeImageTag);

	return text;
}

var writeImageTag = function(wholeMatch,m1,m2,m3,m4,m5,m6,m7) {
	var whole_match = m1;
	var alt_text   = m2;
	var link_id	 = m3.toLowerCase();
	var url		= m4;
	var title	= m7;

	if (!title) title = "";
	
	if (url == "") {
		if (link_id == "") {
			// lower-case and turn embedded newlines into spaces
			link_id = alt_text.toLowerCase().replace(/ ?\n/g," ");
		}
		url = "#"+link_id;
		
		if (g_urls[link_id] != undefined) {
			url = g_urls[link_id];
			if (g_titles[link_id] != undefined) {
				title = g_titles[link_id];
			}
		}
		else {
			return whole_match;
		}
	}	
	
	alt_text = alt_text.replace(/"/g,"&quot;");
	url = escapeCharacters(url,"*_");
	var result = "<img src=\"" + url + "\" alt=\"" + alt_text + "\"";

	// attacklab: Markdown.pl adds empty title attributes to images.
	// Replicate this bug.

	//if (title != "") {
		title = title.replace(/"/g,"&quot;");
		title = escapeCharacters(title,"*_");
		result +=  " title=\"" + title + "\"";
	//}
	
	result += " />";
	
	return result;
}


var _DoHeaders = function(text) {

	// Setext-style headers:
	//	Header 1
	//	========
	//  
	//	Header 2
	//	--------
	//
	text = text.replace(/^(.+)[ \t]*\n=+[ \t]*\n+/gm,
		function(wholeMatch,m1){return hashBlock("<h1>" + _RunSpanGamut(m1) + "</h1>");});

	text = text.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm,
		function(matchFound,m1){return hashBlock("<h2>" + _RunSpanGamut(m1) + "</h2>");});

	// atx-style headers:
	//  # Header 1
	//  ## Header 2
	//  ## Header 2 with closing hashes ##
	//  ...
	//  ###### Header 6
	//

	/*
		text = text.replace(/
			^(\#{1,6})				// $1 = string of #'s
			[ \t]*
			(.+?)					// $2 = Header text
			[ \t]*
			\#*						// optional closing #'s (not counted)
			\n+
		/gm, function() {...});
	*/

	text = text.replace(/^(\#{1,6})[ \t]*(.+?)[ \t]*\#*\n+/gm,
		function(wholeMatch,m1,m2) {
			var h_level = m1.length;
			return hashBlock("<h" + h_level + ">" + _RunSpanGamut(m2) + "</h" + h_level + ">");
		});

	return text;
}

// This declaration keeps Dojo compressor from outputting garbage:
var _ProcessListItems;

var _DoLists = function(text) {
//
// Form HTML ordered (numbered) and unordered (bulleted) lists.
//

	// attacklab: add sentinel to hack around khtml/safari bug:
	// http://bugs.webkit.org/show_bug.cgi?id=11231
	text += "~0";

	// Re-usable pattern to match any entirel ul or ol list:

	/*
		var whole_list = /
		(									// $1 = whole list
			(								// $2
				[ ]{0,3}					// attacklab: g_tab_width - 1
				([*+-]|\d+[.])				// $3 = first list item marker
				[ \t]+
			)
			[^\r]+?
			(								// $4
				~0							// sentinel for workaround; should be $
			|
				\n{2,}
				(?=\S)
				(?!							// Negative lookahead for another list item marker
					[ \t]*
					(?:[*+-]|\d+[.])[ \t]+
				)
			)
		)/g
	*/
	var whole_list = /^(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm;

	if (g_list_level) {
		text = text.replace(whole_list,function(wholeMatch,m1,m2) {
			var list = m1;
			var list_type = (m2.search(/[*+-]/g)>-1) ? "ul" : "ol";

			// Turn double returns into triple returns, so that we can make a
			// paragraph for the last item in a list, if necessary:
			list = list.replace(/\n{2,}/g,"\n\n\n");;
			var result = _ProcessListItems(list);
	
			// Trim any trailing whitespace, to put the closing `</$list_type>`
			// up on the preceding line, to get it past the current stupid
			// HTML block parser. This is a hack to work around the terrible
			// hack that is the HTML block parser.
			result = result.replace(/\s+$/,"");
			result = "<"+list_type+">" + result + "</"+list_type+">\n";
			return result;
		});
	} else {
		whole_list = /(\n\n|^\n?)(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/g;
		text = text.replace(whole_list,function(wholeMatch,m1,m2,m3) {
			var runup = m1;
			var list = m2;

			var list_type = (m3.search(/[*+-]/g)>-1) ? "ul" : "ol";
			// Turn double returns into triple returns, so that we can make a
			// paragraph for the last item in a list, if necessary:
			var list = list.replace(/\n{2,}/g,"\n\n\n");;
			var result = _ProcessListItems(list);
			result = runup + "<"+list_type+">\n" + result + "</"+list_type+">\n";	
			return result;
		});
	}

	// attacklab: strip sentinel
	text = text.replace(/~0/,"");

	return text;
}

_ProcessListItems = function(list_str) {
//
//  Process the contents of a single ordered or unordered list, splitting it
//  into individual list items.
//
	// The $g_list_level global keeps track of when we're inside a list.
	// Each time we enter a list, we increment it; when we leave a list,
	// we decrement. If it's zero, we're not in a list anymore.
	//
	// We do this because when we're not inside a list, we want to treat
	// something like this:
	//
	//    I recommend upgrading to version
	//    8. Oops, now this line is treated
	//    as a sub-list.
	//
	// As a single paragraph, despite the fact that the second line starts
	// with a digit-period-space sequence.
	//
	// Whereas when we're inside a list (or sub-list), that line will be
	// treated as the start of a sub-list. What a kludge, huh? This is
	// an aspect of Markdown's syntax that's hard to parse perfectly
	// without resorting to mind-reading. Perhaps the solution is to
	// change the syntax rules such that sub-lists must start with a
	// starting cardinal number; e.g. "1." or "a.".

	g_list_level++;

	// trim trailing blank lines:
	list_str = list_str.replace(/\n{2,}$/,"\n");

	// attacklab: add sentinel to emulate \z
	list_str += "~0";

	/*
		list_str = list_str.replace(/
			(\n)?							// leading line = $1
			(^[ \t]*)						// leading whitespace = $2
			([*+-]|\d+[.]) [ \t]+			// list marker = $3
			([^\r]+?						// list item text   = $4
			(\n{1,2}))
			(?= \n* (~0 | \2 ([*+-]|\d+[.]) [ \t]+))
		/gm, function(){...});
	*/
	list_str = list_str.replace(/(\n)?(^[ \t]*)([*+-]|\d+[.])[ \t]+([^\r]+?(\n{1,2}))(?=\n*(~0|\2([*+-]|\d+[.])[ \t]+))/gm,
		function(wholeMatch,m1,m2,m3,m4){
			var item = m4;
			var leading_line = m1;
			var leading_space = m2;

			if (leading_line || (item.search(/\n{2,}/)>-1)) {
				item = _RunBlockGamut(_Outdent(item));
			}
			else {
				// Recursion for sub-lists:
				item = _DoLists(_Outdent(item));
				item = item.replace(/\n$/,""); // chomp(item)
				item = _RunSpanGamut(item);
			}

			return  "<li>" + item + "</li>\n";
		}
	);

	// attacklab: strip sentinel
	list_str = list_str.replace(/~0/g,"");

	g_list_level--;
	return list_str;
}


var _DoCodeBlocks = function(text) {
//
//  Process Markdown `<pre><code>` blocks.
//  

	/*
		text = text.replace(text,
			/(?:\n\n|^)
			(								// $1 = the code block -- one or more lines, starting with a space/tab
				(?:
					(?:[ ]{4}|\t)			// Lines must start with a tab or a tab-width of spaces - attacklab: g_tab_width
					.*\n+
				)+
			)
			(\n*[ ]{0,3}[^ \t\n]|(?=~0))	// attacklab: g_tab_width
		/g,function(){...});
	*/

	// attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
	text += "~0";
	
	text = text.replace(/(?:\n\n|^)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=~0))/g,
		function(wholeMatch,m1,m2) {
			var codeblock = m1;
			var nextChar = m2;
		
			codeblock = _EncodeCode( _Outdent(codeblock));
			codeblock = _Detab(codeblock);
			codeblock = codeblock.replace(/^\n+/g,""); // trim leading newlines
			codeblock = codeblock.replace(/\n+$/g,""); // trim trailing whitespace

			codeblock = "<pre><code>" + codeblock + "\n</code></pre>";

			return hashBlock(codeblock) + nextChar;
		}
	);

	// attacklab: strip sentinel
	text = text.replace(/~0/,"");

	return text;
}

var hashBlock = function(text) {
	text = text.replace(/(^\n+|\n+$)/g,"");
	return "\n\n~K" + (g_html_blocks.push(text)-1) + "K\n\n";
}


var _DoCodeSpans = function(text) {
//
//   *  Backtick quotes are used for <code></code> spans.
// 
//   *  You can use multiple backticks as the delimiters if you want to
//	 include literal backticks in the code span. So, this input:
//	 
//		 Just type ``foo `bar` baz`` at the prompt.
//	 
//	   Will translate to:
//	 
//		 <p>Just type <code>foo `bar` baz</code> at the prompt.</p>
//	 
//	There's no arbitrary limit to the number of backticks you
//	can use as delimters. If you need three consecutive backticks
//	in your code, use four for delimiters, etc.
//
//  *  You can use spaces to get literal backticks at the edges:
//	 
//		 ... type `` `bar` `` ...
//	 
//	   Turns to:
//	 
//		 ... type <code>`bar`</code> ...
//

	/*
		text = text.replace(/
			(^|[^\\])					// Character before opening ` can't be a backslash
			(`+)						// $2 = Opening run of `
			(							// $3 = The code block
				[^\r]*?
				[^`]					// attacklab: work around lack of lookbehind
			)
			\2							// Matching closer
			(?!`)
		/gm, function(){...});
	*/

	text = text.replace(/(^|[^\\])(`+)([^\r]*?[^`])\2(?!`)/gm,
		function(wholeMatch,m1,m2,m3,m4) {
			var c = m3;
			c = c.replace(/^([ \t]*)/g,"");	// leading whitespace
			c = c.replace(/[ \t]*$/g,"");	// trailing whitespace
			c = _EncodeCode(c);
			return m1+"<code>"+c+"</code>";
		});

	return text;
}


var _EncodeCode = function(text) {
//
// Encode/escape certain characters inside Markdown code runs.
// The point is that in code, these characters are literals,
// and lose their special Markdown meanings.
//
	// Encode all ampersands; HTML entities are not
	// entities within a Markdown code span.
	text = text.replace(/&/g,"&amp;");

	// Do the angle bracket song and dance:
	text = text.replace(/</g,"&lt;");
	text = text.replace(/>/g,"&gt;");

	// Now, escape characters that are magic in Markdown:
	text = escapeCharacters(text,"\*_{}[]\\",false);

// jj the line above breaks this:
//---

//* Item

//   1. Subitem

//            special char: *
//---

	return text;
}


var _DoItalicsAndBold = function(text) {

	// <strong> must go first:
	text = text.replace(/(\*\*|__)(?=\S)([^\r]*?\S[\*_]*)\1/g,
		"<strong>$2</strong>");

	text = text.replace(/(\*|_)(?=\S)([^\r]*?\S)\1/g,
		"<em>$2</em>");

	return text;
}


var _DoBlockQuotes = function(text) {

	/*
		text = text.replace(/
		(								// Wrap whole match in $1
			(
				^[ \t]*>[ \t]?			// '>' at the start of a line
				.+\n					// rest of the first line
				(.+\n)*					// subsequent consecutive lines
				\n*						// blanks
			)+
		)
		/gm, function(){...});
	*/

	text = text.replace(/((^[ \t]*>[ \t]?.+\n(.+\n)*\n*)+)/gm,
		function(wholeMatch,m1) {
			var bq = m1;

			// attacklab: hack around Konqueror 3.5.4 bug:
			// "----------bug".replace(/^-/g,"") == "bug"

			bq = bq.replace(/^[ \t]*>[ \t]?/gm,"~0");	// trim one level of quoting

			// attacklab: clean up hack
			bq = bq.replace(/~0/g,"");

			bq = bq.replace(/^[ \t]+$/gm,"");		// trim whitespace-only lines
			bq = _RunBlockGamut(bq);				// recurse
			
			bq = bq.replace(/(^|\n)/g,"$1  ");
			// These leading spaces screw with <pre> content, so we need to fix that:
			bq = bq.replace(
					/(\s*<pre>[^\r]+?<\/pre>)/gm,
				function(wholeMatch,m1) {
					var pre = m1;
					// attacklab: hack around Konqueror 3.5.4 bug:
					pre = pre.replace(/^  /mg,"~0");
					pre = pre.replace(/~0/g,"");
					return pre;
				});
			
			return hashBlock("<blockquote>\n" + bq + "\n</blockquote>");
		});
	return text;
}


var _FormParagraphs = function(text) {
//
//  Params:
//    $text - string to process with html <p> tags
//

	// Strip leading and trailing lines:
	text = text.replace(/^\n+/g,"");
	text = text.replace(/\n+$/g,"");

	var grafs = text.split(/\n{2,}/g);
	var grafsOut = new Array();

	//
	// Wrap <p> tags.
	//
	var end = grafs.length;
	for (var i=0; i<end; i++) {
		var str = grafs[i];

		// if this is an HTML marker, copy it
		if (str.search(/~K(\d+)K/g) >= 0) {
			grafsOut.push(str);
		}
		else if (str.search(/\S/) >= 0) {
			str = _RunSpanGamut(str);
			str = str.replace(/^([ \t]*)/g,"<p>");
			str += "</p>"
			grafsOut.push(str);
		}

	}

	//
	// Unhashify HTML blocks
	//
	end = grafsOut.length;
	for (var i=0; i<end; i++) {
		// if this is a marker for an html block...
		while (grafsOut[i].search(/~K(\d+)K/) >= 0) {
			var blockText = g_html_blocks[RegExp.$1];
			blockText = blockText.replace(/\$/g,"$$$$"); // Escape any dollar signs
			grafsOut[i] = grafsOut[i].replace(/~K\d+K/,blockText);
		}
	}

	return grafsOut.join("\n\n");
}


var _EncodeAmpsAndAngles = function(text) {
// Smart processing for ampersands and angle brackets that need to be encoded.
	
	// Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
	//   http://bumppo.net/projects/amputator/
	text = text.replace(/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/g,"&amp;");
	
	// Encode naked <'s
	text = text.replace(/<(?![a-z\/?\$!])/gi,"&lt;");
	
	return text;
}


var _EncodeBackslashEscapes = function(text) {
//
//   Parameter:  String.
//   Returns:	The string, with after processing the following backslash
//			   escape sequences.
//

	// attacklab: The polite way to do this is with the new
	// escapeCharacters() function:
	//
	// 	text = escapeCharacters(text,"\\",true);
	// 	text = escapeCharacters(text,"`*_{}[]()>#+-.!",true);
	//
	// ...but we're sidestepping its use of the (slow) RegExp constructor
	// as an optimization for Firefox.  This function gets called a LOT.

	text = text.replace(/\\(\\)/g,escapeCharacters_callback);
	text = text.replace(/\\([`*_{}\[\]()>#+-.!])/g,escapeCharacters_callback);
	return text;
}


var _DoAutoLinks = function(text) {

	text = text.replace(/<((https?|ftp|dict):[^'">\s]+)>/gi,"<a href=\"$1\">$1</a>");

	// Email addresses: <address@domain.foo>

	/*
		text = text.replace(/
			<
			(?:mailto:)?
			(
				[-.\w]+
				\@
				[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
			)
			>
		/gi, _DoAutoLinks_callback());
	*/
	text = text.replace(/<(?:mailto:)?([-.\w]+\@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi,
		function(wholeMatch,m1) {
			return _EncodeEmailAddress( _UnescapeSpecialChars(m1) );
		}
	);

	return text;
}


var _EncodeEmailAddress = function(addr) {
//
//  Input: an email address, e.g. "foo@example.com"
//
//  Output: the email address as a mailto link, with each character
//	of the address encoded as either a decimal or hex entity, in
//	the hopes of foiling most address harvesting spam bots. E.g.:
//
//	<a href="&#x6D;&#97;&#105;&#108;&#x74;&#111;:&#102;&#111;&#111;&#64;&#101;
//	   x&#x61;&#109;&#x70;&#108;&#x65;&#x2E;&#99;&#111;&#109;">&#102;&#111;&#111;
//	   &#64;&#101;x&#x61;&#109;&#x70;&#108;&#x65;&#x2E;&#99;&#111;&#109;</a>
//
//  Based on a filter by Matthew Wickline, posted to the BBEdit-Talk
//  mailing list: <http://tinyurl.com/yu7ue>
//

	// attacklab: why can't javascript speak hex?
	function char2hex(ch) {
		var hexDigits = '0123456789ABCDEF';
		var dec = ch.charCodeAt(0);
		return(hexDigits.charAt(dec>>4) + hexDigits.charAt(dec&15));
	}

	var encode = [
		function(ch){return "&#"+ch.charCodeAt(0)+";";},
		function(ch){return "&#x"+char2hex(ch)+";";},
		function(ch){return ch;}
	];

	addr = "mailto:" + addr;

	addr = addr.replace(/./g, function(ch) {
		if (ch == "@") {
		   	// this *must* be encoded. I insist.
			ch = encode[Math.floor(Math.random()*2)](ch);
		} else if (ch !=":") {
			// leave ':' alone (to spot mailto: later)
			var r = Math.random();
			// roughly 10% raw, 45% hex, 45% dec
			ch =  (
					r > .9  ?	encode[2](ch)   :
					r > .45 ?	encode[1](ch)   :
								encode[0](ch)
				);
		}
		return ch;
	});

	addr = "<a href=\"" + addr + "\">" + addr + "</a>";
	addr = addr.replace(/">.+:/g,"\">"); // strip the mailto: from the visible part

	return addr;
}


var _UnescapeSpecialChars = function(text) {
//
// Swap back in all the special characters we've hidden.
//
	text = text.replace(/~E(\d+)E/g,
		function(wholeMatch,m1) {
			var charCodeToReplace = parseInt(m1);
			return String.fromCharCode(charCodeToReplace);
		}
	);
	return text;
}


var _Outdent = function(text) {
//
// Remove one level of line-leading tabs or spaces
//

	// attacklab: hack around Konqueror 3.5.4 bug:
	// "----------bug".replace(/^-/g,"") == "bug"

	text = text.replace(/^(\t|[ ]{1,4})/gm,"~0"); // attacklab: g_tab_width

	// attacklab: clean up hack
	text = text.replace(/~0/g,"")

	return text;
}

var _Detab = function(text) {
// attacklab: Detab's completely rewritten for speed.
// In perl we could fix it by anchoring the regexp with \G.
// In javascript we're less fortunate.

	// expand first n-1 tabs
	text = text.replace(/\t(?=\t)/g,"    "); // attacklab: g_tab_width

	// replace the nth with two sentinels
	text = text.replace(/\t/g,"~A~B");

	// use the sentinel to anchor our regex so it doesn't explode
	text = text.replace(/~B(.+?)~A/g,
		function(wholeMatch,m1,m2) {
			var leadingText = m1;
			var numSpaces = 4 - leadingText.length % 4;  // attacklab: g_tab_width

			// there *must* be a better way to do this:
			for (var i=0; i<numSpaces; i++) leadingText+=" ";

			return leadingText;
		}
	);

	// clean up sentinels
	text = text.replace(/~A/g,"    ");  // attacklab: g_tab_width
	text = text.replace(/~B/g,"");

	return text;
}


//
//  attacklab: Utility functions
//


var escapeCharacters = function(text, charsToEscape, afterBackslash) {
	// First we have to escape the escape characters so that
	// we can build a character class out of them
	var regexString = "([" + charsToEscape.replace(/([\[\]\\])/g,"\\$1") + "])";

	if (afterBackslash) {
		regexString = "\\\\" + regexString;
	}

	var regex = new RegExp(regexString,"g");
	text = text.replace(regex,escapeCharacters_callback);

	return text;
}


var escapeCharacters_callback = function(wholeMatch,m1) {
	var charCodeToEscape = m1.charCodeAt(0);
	return "~E"+charCodeToEscape+"E";
}

} // end of Attacklab.showdown.converter


// Version 0.9 used the Showdown namespace instead of Attacklab.showdown
// The old namespace is deprecated, but we'll support it for now:
var Showdown = Attacklab.showdown;

// If anyone's interested, tell the world that this file's been loaded
if (Attacklab.fileLoaded) {
	Attacklab.fileLoaded("showdown.js");
}
var Attacklab = Attacklab || {};

$.wmd = function() {
Attacklab.wmdBase = function(){

	// A few handy aliases for readability.
	var wmd  = top.Attacklab;
	var doc  = top.document;
	var re   = top.RegExp;
	var nav  = top.navigator;
	
	// Some namespaces.
	wmd.Util = {};
	wmd.Position = {};
	wmd.Command = {};
	wmd.Global = {};
	
	var util = wmd.Util;
	var position = wmd.Position;
	var command = wmd.Command;
	var global = wmd.Global;
	
	
	// Used to work around some browser bugs where we can't use feature testing.
	global.isIE 		= /msie/.test(nav.userAgent.toLowerCase());
	global.isIE_5or6 	= /msie 6/.test(nav.userAgent.toLowerCase()) || /msie 5/.test(nav.userAgent.toLowerCase());
	global.isIE_7plus 	= global.isIE && !global.isIE_5or6;
	global.isOpera 		= /opera/.test(nav.userAgent.toLowerCase());
	global.isKonqueror 	= /konqueror/.test(nav.userAgent.toLowerCase());
	
	
	// -------------------------------------------------------------------
	//  YOUR CHANGES GO HERE
	//
	// I've tried to localize the things you are likely to change to 
	// this area.
	// -------------------------------------------------------------------
	
	// The text that appears on the upper part of the dialog box when
	// entering links.
	var imageDialogText = "<p style='margin-top: 0px'><b>Enter the image URL.</b></p><p>You can also add a title, which will be displayed as a tool tip.</p><p>Example:<br />http://wmd-editor.com/images/cloud1.jpg   \"Optional title\"</p>";
	var linkDialogText = "<p style='margin-top: 0px'><b>Enter the web address.</b></p><p>You can also add a title, which will be displayed as a tool tip.</p><p>Example:<br />http://wmd-editor.com/   \"Optional title\"</p>";
	
	// The default text that appears in the dialog input box when entering
	// links.
	var imageDefaultText = "http://";
	var linkDefaultText = "http://";
	
	// The location of your button images relative to the base directory.
	var imageDirectory = "images/";
	
	// Some intervals in ms.  These can be adjusted to reduce the control's load.
	var previewPollInterval = 500;
	var pastePollInterval = 100;
	
	// The link and title for the help button
	var helpLink = "http://wmd-editor.com/";
	var helpHoverTitle = "WMD website";
	var helpTarget = "_blank";
	
	// -------------------------------------------------------------------
	//  END OF YOUR CHANGES
	// -------------------------------------------------------------------
	
	// A collection of the important regions on the page.
	// Cached so we don't have to keep traversing the DOM.
	wmd.PanelCollection = function(){
		this.buttonBar = doc.getElementById("wmd-button-bar");
		this.preview = doc.getElementById("wmd-preview");
		this.output = doc.getElementById("wmd-output");
		this.input = doc.getElementById("wmd-input");
	};
	
	// This PanelCollection object can't be filled until after the page
	// has loaded.
	wmd.panels = undefined;
	
	// Internet explorer has problems with CSS sprite buttons that use HTML
	// lists.  When you click on the background image "button", IE will 
	// select the non-existent link text and discard the selection in the
	// textarea.  The solution to this is to cache the textarea selection
	// on the button's mousedown event and set a flag.  In the part of the
	// code where we need to grab the selection, we check for the flag
	// and, if it's set, use the cached area instead of querying the
	// textarea.
	//
	// This ONLY affects Internet Explorer (tested on versions 6, 7
	// and 8) and ONLY on button clicks.  Keyboard shortcuts work
	// normally since the focus never leaves the textarea.
	wmd.ieCachedRange = null;		// cached textarea selection
	wmd.ieRetardedClick = false;	// flag
	
	// Returns true if the DOM element is visible, false if it's hidden.
	// Checks if display is anything other than none.
	util.isVisible = function (elem) {
	
	    if (window.getComputedStyle) {
	        // Most browsers
			return window.getComputedStyle(elem, null).getPropertyValue("display") !== "none";
		}
		else if (elem.currentStyle) {
		    // IE
			return elem.currentStyle["display"] !== "none";
		}
	};
	
	
	// Adds a listener callback to a DOM element which is fired on a specified
	// event.
	util.addEvent = function(elem, event, listener){
		if (elem.attachEvent) {
			// IE only.  The "on" is mandatory.
			elem.attachEvent("on" + event, listener);
		}
		else {
			// Other browsers.
			elem.addEventListener(event, listener, false);
		}
	};

	
	// Removes a listener callback from a DOM element which is fired on a specified
	// event.
	util.removeEvent = function(elem, event, listener){
		if (elem.detachEvent) {
			// IE only.  The "on" is mandatory.
			elem.detachEvent("on" + event, listener);
		}
		else {
			// Other browsers.
			elem.removeEventListener(event, listener, false);
		}
	};

	// Converts \r\n and \r to \n.
	util.fixEolChars = function(text){
		text = text.replace(/\r\n/g, "\n");
		text = text.replace(/\r/g, "\n");
		return text;
	};

	// Extends a regular expression.  Returns a new RegExp
	// using pre + regex + post as the expression.
	// Used in a few functions where we have a base
	// expression and we want to pre- or append some
	// conditions to it (e.g. adding "$" to the end).
	// The flags are unchanged.
	//
	// regex is a RegExp, pre and post are strings.
	util.extendRegExp = function(regex, pre, post){
		
		if (pre === null || pre === undefined)
		{
			pre = "";
		}
		if(post === null || post === undefined)
		{
			post = "";
		}
		
		var pattern = regex.toString();
		var flags = "";
		
		// Replace the flags with empty space and store them.
		// Technically, this can match incorrect flags like "gmm".
		var result = pattern.match(/\/([gim]*)$/);
		if (result === null) {
			flags = result[0];
		}
		else {
			flags = "";
		}
		
		// Remove the flags and slash delimiters from the regular expression.
		pattern = pattern.replace(/(^\/|\/[gim]*$)/g, "");
		pattern = pre + pattern + post;
		
		return new RegExp(pattern, flags);
	}

	
	// Sets the image for a button passed to the WMD editor.
	// Returns a new element with the image attached.
	// Adds several style properties to the image.
	util.createImage = function(img){
		
		var imgPath = imageDirectory + img;
		
		var elem = doc.createElement("img");
		elem.className = "wmd-button";
		elem.src = imgPath;

		return elem;
	};
	

	// This simulates a modal dialog box and asks for the URL when you
	// click the hyperlink or image buttons.
	//
	// text: The html for the input box.
	// defaultInputText: The default value that appears in the input box.
	// makeLinkMarkdown: The function which is executed when the prompt is dismissed, either via OK or Cancel
	util.prompt = function(text, defaultInputText, makeLinkMarkdown){
	
		// These variables need to be declared at this level since they are used
		// in multiple functions.
		var dialog;			// The dialog box.
		var background;		// The background beind the dialog box.
		var input;			// The text box where you enter the hyperlink.
		

		if (defaultInputText === undefined) {
			defaultInputText = "";
		}
		
		// Used as a keydown event handler. Esc dismisses the prompt.
		// Key code 27 is ESC.
		var checkEscape = function(key){
			var code = (key.charCode || key.keyCode);
			if (code === 27) {
				close(true);
			}
		};
		
		// Dismisses the hyperlink input box.
		// isCancel is true if we don't care about the input text.
		// isCancel is false if we are going to keep the text.
		var close = function(isCancel){
			util.removeEvent(doc.body, "keydown", checkEscape);
			var text = input.value;

			if (isCancel){
				text = null;
			}
			else{
				// Fixes common pasting errors.
				text = text.replace('http://http://', 'http://');
				text = text.replace('http://https://', 'https://');
				text = text.replace('http://ftp://', 'ftp://');
				
				if (text.indexOf('http://') === -1 && text.indexOf('ftp://') === -1 && text.indexOf('https://') === -1) {
					text = 'http://' + text;
				}
			}
			
			dialog.parentNode.removeChild(dialog);
			background.parentNode.removeChild(background);
			makeLinkMarkdown(text);
			return false;
		};
		
		// Creates the background behind the hyperlink text entry box.
		// Most of this has been moved to CSS but the div creation and
		// browser-specific hacks remain here.
		var createBackground = function(){
		
			background = doc.createElement("div");
			background.className = "wmd-prompt-background";
			style = background.style;
			style.position = "absolute";
			style.top = "0";
			
			style.zIndex = "1000";
			
			// Some versions of Konqueror don't support transparent colors
			// so we make the whole window transparent.
			//
			// Is this necessary on modern konqueror browsers?
			if (global.isKonqueror){
				style.backgroundColor = "transparent";
			}
			else if (global.isIE){
				style.filter = "alpha(opacity=50)";
			}
			else {
				style.opacity = "0.5";
			}
			
			var pageSize = position.getPageSize();
			style.height = pageSize[1] + "px";
			
			if(global.isIE){
				style.left = doc.documentElement.scrollLeft;
				style.width = doc.documentElement.clientWidth;
			}
			else {
				style.left = "0";
				style.width = "100%";
			}
			
			doc.body.appendChild(background);
		};
		
		// Create the text input box form/window.
		var createDialog = function(){
		
			// The main dialog box.
			dialog = doc.createElement("div");
			dialog.className = "wmd-prompt-dialog";
			dialog.style.padding = "10px;";
			dialog.style.position = "fixed";
			dialog.style.width = "400px";
			dialog.style.zIndex = "1001";
			
			// The dialog text.
			var question = doc.createElement("div");
			question.innerHTML = text;
			question.style.padding = "5px";
			dialog.appendChild(question);
			
			// The web form container for the text box and buttons.
			var form = doc.createElement("form");
			form.onsubmit = function(){ return close(false); };
			style = form.style;
			style.padding = "0";
			style.margin = "0";
			style.cssFloat = "left";
			style.width = "100%";
			style.textAlign = "center";
			style.position = "relative";
			dialog.appendChild(form);
			
			// The input text box
			input = doc.createElement("input");
			input.type = "text";
			input.value = defaultInputText;
			style = input.style;
			style.display = "block";
			style.width = "80%";
			style.marginLeft = style.marginRight = "auto";
			form.appendChild(input);
			
			// The ok button
			var okButton = doc.createElement("input");
			okButton.type = "button";
			okButton.onclick = function(){ return close(false); };
			okButton.value = "OK";
			style = okButton.style;
			style.margin = "10px";
			style.display = "inline";
			style.width = "7em";

			
			// The cancel button
			var cancelButton = doc.createElement("input");
			cancelButton.type = "button";
			cancelButton.onclick = function(){ return close(true); };
			cancelButton.value = "Cancel";
			style = cancelButton.style;
			style.margin = "10px";
			style.display = "inline";
			style.width = "7em";

			// The order of these buttons is different on macs.
			if (/mac/.test(nav.platform.toLowerCase())) {
				form.appendChild(cancelButton);
				form.appendChild(okButton);
			}
			else {
				form.appendChild(okButton);
				form.appendChild(cancelButton);
			}

			util.addEvent(doc.body, "keydown", checkEscape);
			dialog.style.top = "50%";
			dialog.style.left = "50%";
			dialog.style.display = "block";
			if(global.isIE_5or6){
				dialog.style.position = "absolute";
				dialog.style.top = doc.documentElement.scrollTop + 200 + "px";
				dialog.style.left = "50%";
			}
			doc.body.appendChild(dialog);
			
			// This has to be done AFTER adding the dialog to the form if you
			// want it to be centered.
			dialog.style.marginTop = -(position.getHeight(dialog) / 2) + "px";
			dialog.style.marginLeft = -(position.getWidth(dialog) / 2) + "px";
			
		};
		
		createBackground();
		
		// Why is this in a zero-length timeout?
		// Is it working around a browser bug?
		top.setTimeout(function(){
		
			createDialog();

			var defTextLen = defaultInputText.length;
			if (input.selectionStart !== undefined) {
				input.selectionStart = 0;
				input.selectionEnd = defTextLen;
			}
			else if (input.createTextRange) {
				var range = input.createTextRange();
				range.collapse(false);
				range.moveStart("character", -defTextLen);
				range.moveEnd("character", defTextLen);
				range.select();
			}
			
			input.focus();
		}, 0);
	};
	
	
	// UNFINISHED
	// The assignment in the while loop makes jslint cranky.
	// I'll change it to a better loop later.
	position.getTop = function(elem, isInner){
		var result = elem.offsetTop;
		if (!isInner) {
			while (elem = elem.offsetParent) {
				result += elem.offsetTop;
			}
		}
		return result;
	};
	
	position.getHeight = function (elem) {
		return elem.offsetHeight || elem.scrollHeight;
	};

	position.getWidth = function (elem) {
		return elem.offsetWidth || elem.scrollWidth;
	};

	position.getPageSize = function(){
		
		var scrollWidth, scrollHeight;
		var innerWidth, innerHeight;
		
		// It's not very clear which blocks work with which browsers.
		if(self.innerHeight && self.scrollMaxY){
			scrollWidth = doc.body.scrollWidth;
			scrollHeight = self.innerHeight + self.scrollMaxY;
		}
		else if(doc.body.scrollHeight > doc.body.offsetHeight){
			scrollWidth = doc.body.scrollWidth;
			scrollHeight = doc.body.scrollHeight;
		}
		else{
			scrollWidth = doc.body.offsetWidth;
			scrollHeight = doc.body.offsetHeight;
		}
		
		if(self.innerHeight){
			// Non-IE browser
			innerWidth = self.innerWidth;
			innerHeight = self.innerHeight;
		}
		else if(doc.documentElement && doc.documentElement.clientHeight){
			// Some versions of IE (IE 6 w/ a DOCTYPE declaration)
			innerWidth = doc.documentElement.clientWidth;
			innerHeight = doc.documentElement.clientHeight;
		}
		else if(doc.body){
			// Other versions of IE
			innerWidth = doc.body.clientWidth;
			innerHeight = doc.body.clientHeight;
		}
		
        var maxWidth = Math.max(scrollWidth, innerWidth);
        var maxHeight = Math.max(scrollHeight, innerHeight);
        return [maxWidth, maxHeight, innerWidth, innerHeight];
	};
	
	// Watches the input textarea, polling at an interval and runs
	// a callback function if anything has changed.
	wmd.inputPoller = function(callback, interval){
	
		var pollerObj = this;
		var inputArea = wmd.panels.input;
		
		// Stored start, end and text.  Used to see if there are changes to the input.
		var lastStart;
		var lastEnd;
		var markdown;
		
		var killHandle; // Used to cancel monitoring on destruction.
		// Checks to see if anything has changed in the textarea.
		// If so, it runs the callback.
		this.tick = function(){
		
			if (!util.isVisible(inputArea)) {
				return;
			}
			
			// Update the selection start and end, text.
			if (inputArea.selectionStart || inputArea.selectionStart === 0) {
				var start = inputArea.selectionStart;
				var end = inputArea.selectionEnd;
				if (start != lastStart || end != lastEnd) {
					lastStart = start;
					lastEnd = end;
					
					if (markdown != inputArea.value) {
						markdown = inputArea.value;
						return true;
					}
				}
			}
			return false;
		};
		
		
		var doTickCallback = function(){
		
			if (!util.isVisible(inputArea)) {
				return;
			}
			
			// If anything has changed, call the function.
			if (pollerObj.tick()) {
				callback();
			}
		};
		
		// Set how often we poll the textarea for changes.
		var assignInterval = function(){
			// previewPollInterval is set at the top of the namespace.
			killHandle = top.setInterval(doTickCallback, interval);
		};
		
		this.destroy = function(){
			top.clearInterval(killHandle);
		};
		
		assignInterval();
	};
	
	// Handles pushing and popping TextareaStates for undo/redo commands.
	// I should rename the stack variables to list.
	wmd.undoManager = function(callback){
	
		var undoObj = this;
		var undoStack = []; // A stack of undo states
		var stackPtr = 0; // The index of the current state
		var mode = "none";
		var lastState; // The last state
		var poller;
		var timer; // The setTimeout handle for cancelling the timer
		var inputStateObj;
		
		// Set the mode for later logic steps.
		var setMode = function(newMode, noSave){
		
			if (mode != newMode) {
				mode = newMode;
				if (!noSave) {
					saveState();
				}
			}
			
			if (!global.isIE || mode != "moving") {
				timer = top.setTimeout(refreshState, 1);
			}
			else {
				inputStateObj = null;
			}
		};
		
		var refreshState = function(){
			inputStateObj = new wmd.TextareaState();
			poller.tick();
			timer = undefined;
		};
		
		this.setCommandMode = function(){
			mode = "command";
			saveState();
			timer = top.setTimeout(refreshState, 0);
		};
		
		this.canUndo = function(){
			return stackPtr > 1;
		};
		
		this.canRedo = function(){
			if (undoStack[stackPtr + 1]) {
				return true;
			}
			return false;
		};
		
		// Removes the last state and restores it.
		this.undo = function(){
		
			if (undoObj.canUndo()) {
				if (lastState) {
					// What about setting state -1 to null or checking for undefined?
					lastState.restore();
					lastState = null;
				}
				else {
					undoStack[stackPtr] = new wmd.TextareaState();
					undoStack[--stackPtr].restore();
					
					if (callback) {
						callback();
					}
				}
			}
			
			mode = "none";
			wmd.panels.input.focus();
			refreshState();
		};
		
		// Redo an action.
		this.redo = function(){
		
			if (undoObj.canRedo()) {
			
				undoStack[++stackPtr].restore();
				
				if (callback) {
					callback();
				}
			}
			
			mode = "none";
			wmd.panels.input.focus();
			refreshState();
		};
		
		// Push the input area state to the stack.
		var saveState = function(){
		
			var currState = inputStateObj || new wmd.TextareaState();
			
			if (!currState) {
				return false;
			}
			if (mode == "moving") {
				if (!lastState) {
					lastState = currState;
				}
				return;
			}
			if (lastState) {
				if (undoStack[stackPtr - 1].text != lastState.text) {
					undoStack[stackPtr++] = lastState;
				}
				lastState = null;
			}
			undoStack[stackPtr++] = currState;
			undoStack[stackPtr + 1] = null;
			if (callback) {
				callback();
			}
		};
		
		var handleCtrlYZ = function(event){
		
			var handled = false;
			
			if (event.ctrlKey || event.metaKey) {
			
				// IE and Opera do not support charCode.
				var keyCode = event.charCode || event.keyCode;
				var keyCodeChar = String.fromCharCode(keyCode);
				
				switch (keyCodeChar) {
				
					case "y":
						undoObj.redo();
						handled = true;
						break;
						
					case "z":
						if (!event.shiftKey) {
							undoObj.undo();
						}
						else {
							undoObj.redo();
						}
						handled = true;
						break;
				}
			}
			
			if (handled) {
				if (event.preventDefault) {
					event.preventDefault();
				}
				if (top.event) {
					top.event.returnValue = false;
				}
				return;
			}
		};
		
		// Set the mode depending on what is going on in the input area.
		var handleModeChange = function(event){
		
			if (!event.ctrlKey && !event.metaKey) {
			
				var keyCode = event.keyCode;
				
				if ((keyCode >= 33 && keyCode <= 40) || (keyCode >= 63232 && keyCode <= 63235)) {
					// 33 - 40: page up/dn and arrow keys
					// 63232 - 63235: page up/dn and arrow keys on safari
					setMode("moving");
				}
				else if (keyCode == 8 || keyCode == 46 || keyCode == 127) {
					// 8: backspace
					// 46: delete
					// 127: delete
					setMode("deleting");
				}
				else if (keyCode == 13) {
					// 13: Enter
					setMode("newlines");
				}
				else if (keyCode == 27) {
					// 27: escape
					setMode("escape");
				}
				else if ((keyCode < 16 || keyCode > 20) && keyCode != 91) {
					// 16-20 are shift, etc. 
					// 91: left window key
					// I think this might be a little messed up since there are
					// a lot of nonprinting keys above 20.
					setMode("typing");
				}
			}
		};
		
		var setEventHandlers = function(){
		
			util.addEvent(wmd.panels.input, "keypress", function(event){
				// keyCode 89: y
				// keyCode 90: z
				if ((event.ctrlKey || event.metaKey) && (event.keyCode == 89 || event.keyCode == 90)) {
					event.preventDefault();
				}
			});
			
			var handlePaste = function(){
				if (global.isIE || (inputStateObj && inputStateObj.text != wmd.panels.input.value)) {
					if (timer == undefined) {
						mode = "paste";
						saveState();
						refreshState();
					}
				}
			};
			
			// pastePollInterval is specified at the beginning of this namespace.
			poller = new wmd.inputPoller(handlePaste, pastePollInterval);
			
			util.addEvent(wmd.panels.input, "keydown", handleCtrlYZ);
			util.addEvent(wmd.panels.input, "keydown", handleModeChange);
			
			util.addEvent(wmd.panels.input, "mousedown", function(){
				setMode("moving");
			});
			wmd.panels.input.onpaste = handlePaste;
			wmd.panels.input.ondrop = handlePaste;
		};
		
		var init = function(){
			setEventHandlers();
			refreshState();
			saveState();
		};
		
		this.destroy = function(){
			if (poller) {
				poller.destroy();
			}
		};
		
		init();
	};
	
	// I think my understanding of how the buttons and callbacks are stored in the array is incomplete.
	wmd.editor = function(previewRefreshCallback){
	
		if (!previewRefreshCallback) {
			previewRefreshCallback = function(){};
		}
		
		var inputBox = wmd.panels.input;
		
		var offsetHeight = 0;
		
		var editObj = this;
		
		var mainDiv;
		var mainSpan;
		
		var div; // This name is pretty ambiguous.  I should rename this.
		
		// Used to cancel recurring events from setInterval.
		var creationHandle;
		
		var undoMgr; // The undo manager
		
		// Perform the button's action.
		var doClick = function(button){
		
			inputBox.focus();
			
			if (button.textOp) {
				
				if (undoMgr) {
					undoMgr.setCommandMode();
				}
				
				var state = new wmd.TextareaState();
				
				if (!state) {
					return;
				}
				
				var chunks = state.getChunks();
				
				// Some commands launch a "modal" prompt dialog.  Javascript
				// can't really make a modal dialog box and the WMD code
				// will continue to execute while the dialog is displayed.
				// This prevents the dialog pattern I'm used to and means
				// I can't do something like this:
				//
				// var link = CreateLinkDialog();
				// makeMarkdownLink(link);
				// 
				// Instead of this straightforward method of handling a
				// dialog I have to pass any code which would execute
				// after the dialog is dismissed (e.g. link creation)
				// in a function parameter.
				//
				// Yes this is awkward and I think it sucks, but there's
				// no real workaround.  Only the image and link code
				// create dialogs and require the function pointers.
				var fixupInputArea = function(){
				
					inputBox.focus();
					
					if (chunks) {
						state.setChunks(chunks);
					}
					
					state.restore();
					previewRefreshCallback();
				};
				
				var useDefaultText = true;
				var noCleanup = button.textOp(chunks, fixupInputArea, useDefaultText);
				
				if(!noCleanup) {
					fixupInputArea();
				}
				
			}
			
			if (button.execute) {
				button.execute(editObj);
			}
		};
			
		var setUndoRedoButtonStates = function(){
			if(undoMgr){
				setupButton(document.getElementById("wmd-undo-button"), undoMgr.canUndo());
				setupButton(document.getElementById("wmd-redo-button"), undoMgr.canRedo());
			}
		};
		
		var setupButton = function(button, isEnabled) {
		
			var normalYShift = "0px";
			var disabledYShift = "-20px";
			var highlightYShift = "-40px";
			
			if(isEnabled) {
				button.style.backgroundPosition = button.XShift + " " + normalYShift;
				button.onmouseover = function(){
					this.style.backgroundPosition = this.XShift + " " + highlightYShift;
				};
							
				button.onmouseout = function(){
					this.style.backgroundPosition = this.XShift + " " + normalYShift;
				};
				
				// IE tries to select the background image "button" text (it's
				// implemented in a list item) so we have to cache the selection
				// on mousedown.
				if(global.isIE) {
					button.onmousedown =  function() { 
						wmd.ieRetardedClick = true;
						wmd.ieCachedRange = document.selection.createRange(); 
					};
				}
				
				if (!button.isHelp)
				{
					button.onclick = function() {
						if (this.onmouseout) {
							this.onmouseout();
						}
						doClick(this);
						return false;
					}
				}
			}
			else {
				button.style.backgroundPosition = button.XShift + " " + disabledYShift;
				button.onmouseover = button.onmouseout = button.onclick = function(){};
			}
		}
	
		var makeSpritedButtonRow = function(){
		 	
			var buttonBar = document.getElementById("wmd-button-bar");
 	
			var normalYShift = "0px";
			var disabledYShift = "-20px";
			var highlightYShift = "-40px";
			
			var buttonRow = document.createElement("ul");
			buttonRow.id = "wmd-button-row";
			buttonRow = buttonBar.appendChild(buttonRow);

			
			var boldButton = document.createElement("li");
			boldButton.className = "wmd-button";
			boldButton.id = "wmd-bold-button";
			boldButton.title = "Strong <strong> Ctrl+B";
			boldButton.XShift = "0px";
			boldButton.textOp = command.doBold;
			setupButton(boldButton, true);
			buttonRow.appendChild(boldButton);
			
			var italicButton = document.createElement("li");
			italicButton.className = "wmd-button";
			italicButton.id = "wmd-italic-button";
			italicButton.title = "Emphasis <em> Ctrl+I";
			italicButton.XShift = "-20px";
			italicButton.textOp = command.doItalic;
			setupButton(italicButton, true);
			buttonRow.appendChild(italicButton);

			var spacer1 = document.createElement("li");
			spacer1.className = "wmd-spacer";
			spacer1.id = "wmd-spacer1";
			buttonRow.appendChild(spacer1); 

			var linkButton = document.createElement("li");
			linkButton.className = "wmd-button";
			linkButton.id = "wmd-link-button";
			linkButton.title = "Hyperlink <a> Ctrl+L";
			linkButton.XShift = "-40px";
			linkButton.textOp = function(chunk, postProcessing, useDefaultText){
				return command.doLinkOrImage(chunk, postProcessing, false);
			};
			setupButton(linkButton, true);
			buttonRow.appendChild(linkButton);

			var quoteButton = document.createElement("li");
			quoteButton.className = "wmd-button";
			quoteButton.id = "wmd-quote-button";
			quoteButton.title = "Blockquote <blockquote> Ctrl+Q";
			quoteButton.XShift = "-60px";
			quoteButton.textOp = command.doBlockquote;
			setupButton(quoteButton, true);
			buttonRow.appendChild(quoteButton);
			
			var codeButton = document.createElement("li");
			codeButton.className = "wmd-button";
			codeButton.id = "wmd-code-button";
			codeButton.title = "Code Sample <pre><code> Ctrl+K";
			codeButton.XShift = "-80px";
			codeButton.textOp = command.doCode;
			setupButton(codeButton, true);
			buttonRow.appendChild(codeButton);

			var imageButton = document.createElement("li");
			imageButton.className = "wmd-button";
			imageButton.id = "wmd-image-button";
			imageButton.title = "Image <img> Ctrl+G";
			imageButton.XShift = "-100px";
			imageButton.textOp = function(chunk, postProcessing, useDefaultText){
				return command.doLinkOrImage(chunk, postProcessing, true);
			};
			setupButton(imageButton, true);
			buttonRow.appendChild(imageButton);

			var spacer2 = document.createElement("li");
			spacer2.className = "wmd-spacer";
			spacer2.id = "wmd-spacer2";
			buttonRow.appendChild(spacer2); 

			var olistButton = document.createElement("li");
			olistButton.className = "wmd-button";
			olistButton.id = "wmd-olist-button";
			olistButton.title = "Numbered List <ol> Ctrl+O";
			olistButton.XShift = "-120px";
			olistButton.textOp = function(chunk, postProcessing, useDefaultText){
				command.doList(chunk, postProcessing, true, useDefaultText);
			};
			setupButton(olistButton, true);
			buttonRow.appendChild(olistButton);
			
			var ulistButton = document.createElement("li");
			ulistButton.className = "wmd-button";
			ulistButton.id = "wmd-ulist-button";
			ulistButton.title = "Bulleted List <ul> Ctrl+U";
			ulistButton.XShift = "-140px";
			ulistButton.textOp = function(chunk, postProcessing, useDefaultText){
				command.doList(chunk, postProcessing, false, useDefaultText);
			};
			setupButton(ulistButton, true);
			buttonRow.appendChild(ulistButton);
			
			var headingButton = document.createElement("li");
			headingButton.className = "wmd-button";
			headingButton.id = "wmd-heading-button";
			headingButton.title = "Heading <h1>/<h2> Ctrl+H";
			headingButton.XShift = "-160px";
			headingButton.textOp = command.doHeading;
			setupButton(headingButton, true);
			buttonRow.appendChild(headingButton); 
			
			var hrButton = document.createElement("li");
			hrButton.className = "wmd-button";
			hrButton.id = "wmd-hr-button";
			hrButton.title = "Horizontal Rule <hr> Ctrl+R";
			hrButton.XShift = "-180px";
			hrButton.textOp = command.doHorizontalRule;
			setupButton(hrButton, true);
			buttonRow.appendChild(hrButton); 
			
			var spacer3 = document.createElement("li");
			spacer3.className = "wmd-spacer";
			spacer3.id = "wmd-spacer3";
			buttonRow.appendChild(spacer3); 
			
			var undoButton = document.createElement("li");
			undoButton.className = "wmd-button";
			undoButton.id = "wmd-undo-button";
			undoButton.title = "Undo - Ctrl+Z";
			undoButton.XShift = "-200px";
			undoButton.execute = function(manager){
				manager.undo();
			};
			setupButton(undoButton, true);
			buttonRow.appendChild(undoButton); 
			
			var redoButton = document.createElement("li");
			redoButton.className = "wmd-button";
			redoButton.id = "wmd-redo-button";
			redoButton.title = "Redo - Ctrl+Y";
			if (/win/.test(nav.platform.toLowerCase())) {
				redoButton.title = "Redo - Ctrl+Y";
			}
			else {
				// mac and other non-Windows platforms
				redoButton.title = "Redo - Ctrl+Shift+Z";
			}
			redoButton.XShift = "-220px";
			redoButton.execute = function(manager){
				manager.redo();
			};
			setupButton(redoButton, true);
			buttonRow.appendChild(redoButton); 
			
			var helpButton = document.createElement("li");
			helpButton.className = "wmd-button";
			helpButton.id = "wmd-help-button";
			helpButton.XShift = "-240px";
			helpButton.isHelp = true;
			
			var helpAnchor = document.createElement("a");
			helpAnchor.href = helpLink;
			helpAnchor.target = helpTarget
			helpAnchor.title = helpHoverTitle;
			helpButton.appendChild(helpAnchor);
			
			setupButton(helpButton, true);
			buttonRow.appendChild(helpButton);
			
			setUndoRedoButtonStates();
		}
		
		var setupEditor = function(){
		
			if (/\?noundo/.test(doc.location.href)) {
				wmd.nativeUndo = true;
			}
			
			if (!wmd.nativeUndo) {
				undoMgr = new wmd.undoManager(function(){
					previewRefreshCallback();
					setUndoRedoButtonStates();
				});
			}
			
			makeSpritedButtonRow();
			
			
			var keyEvent = "keydown";
			if (global.isOpera) {
				keyEvent = "keypress";
			}
			
			util.addEvent(inputBox, keyEvent, function(key){
				
				// Check to see if we have a button key and, if so execute the callback.
				if (key.ctrlKey || key.metaKey) {
			
					var keyCode = key.charCode || key.keyCode;
					var keyCodeStr = String.fromCharCode(keyCode).toLowerCase();
					
					switch(keyCodeStr) {
						case "b":
							doClick(document.getElementById("wmd-bold-button"));
							break;
						case "i":
							doClick(document.getElementById("wmd-italic-button"));
							break;
						case "l":
							doClick(document.getElementById("wmd-link-button"));
							break;
						case "q":
							doClick(document.getElementById("wmd-quote-button"));
							break;
						case "k":
							doClick(document.getElementById("wmd-code-button"));
							break;
						case "g":
							doClick(document.getElementById("wmd-image-button"));
							break;
						case "o":
							doClick(document.getElementById("wmd-olist-button"));
							break;
						case "u":
							doClick(document.getElementById("wmd-ulist-button"));
							break;
						case "h":
							doClick(document.getElementById("wmd-heading-button"));
							break;
						case "r":
							doClick(document.getElementById("wmd-hr-button"));
							break;
						case "y":
							doClick(document.getElementById("wmd-redo-button"));
							break;
						case "z":
							if(key.shiftKey) {
								doClick(document.getElementById("wmd-redo-button"));
							}
							else {
								doClick(document.getElementById("wmd-undo-button"));
							}
							break;
						default:
							return;
					}
					

					if (key.preventDefault) {
						key.preventDefault();
					}
					
					if (top.event) {
						top.event.returnValue = false;
					}
				}
			});
			
			// Auto-continue lists, code blocks and block quotes when
			// the enter key is pressed.
			util.addEvent(inputBox, "keyup", function(key){
				if (!key.shiftKey && !key.ctrlKey && !key.metaKey) {
					var keyCode = key.charCode || key.keyCode;
					// Key code 13 is Enter
					if (keyCode === 13) {
						fakeButton = {};
						fakeButton.textOp = command.doAutoindent;
						doClick(fakeButton);
					}
				}
			});
			
			// Disable ESC clearing the input textarea on IE
			if (global.isIE) {
				util.addEvent(inputBox, "keydown", function(key){
					var code = key.keyCode;
					// Key code 27 is ESC
					if (code === 27) {
						return false;
					}
				});
			}
			
			if (inputBox.form) {
				var submitCallback = inputBox.form.onsubmit;
				inputBox.form.onsubmit = function(){
					convertToHtml();
					if (submitCallback) {
						return submitCallback.apply(this, arguments);
					}
				};
			}
		};
		
		// Convert the contents of the input textarea to HTML in the output/preview panels.
		var convertToHtml = function(){
		
			if (wmd.showdown) {
				var markdownConverter = new wmd.showdown.converter();
			}
			var text = inputBox.value;
			
			var callback = function(){
				inputBox.value = text;
			};
			
			if (!/markdown/.test(wmd.wmd_env.output.toLowerCase())) {
				if (markdownConverter) {
					inputBox.value = markdownConverter.makeHtml(text);
					top.setTimeout(callback, 0);
				}
			}
			return true;
		};
		
		
		this.undo = function(){
			if (undoMgr) {
				undoMgr.undo();
			}
		};
		
		this.redo = function(){
			if (undoMgr) {
				undoMgr.redo();
			}
		};
		
		// This is pretty useless.  The setupEditor function contents
		// should just be copied here.
		var init = function(){
			setupEditor();
		};
		
		this.destroy = function(){
			if (undoMgr) {
				undoMgr.destroy();
			}
			if (div.parentNode) {
				div.parentNode.removeChild(div);
			}
			if (inputBox) {
				inputBox.style.marginTop = "";
			}
			top.clearInterval(creationHandle);
		};
		
		init();
	};
	
	// The input textarea state/contents.
	// This is used to implement undo/redo by the undo manager.
	wmd.TextareaState = function(){
	
		// Aliases
		var stateObj = this;
		var inputArea = wmd.panels.input;
		
		this.init = function() {
		
			if (!util.isVisible(inputArea)) {
				return;
			}
				
			this.setInputAreaSelectionStartEnd();
			this.scrollTop = inputArea.scrollTop;
			if (!this.text && inputArea.selectionStart || inputArea.selectionStart === 0) {
				this.text = inputArea.value;
			}
			
		}
		
		// Sets the selected text in the input box after we've performed an
		// operation.
		this.setInputAreaSelection = function(){
		
			if (!util.isVisible(inputArea)) {
				return;
			}
			
			if (inputArea.selectionStart !== undefined && !global.isOpera) {
			
				inputArea.focus();
				inputArea.selectionStart = stateObj.start;
				inputArea.selectionEnd = stateObj.end;
				inputArea.scrollTop = stateObj.scrollTop;
			}
			else if (doc.selection) {
				
				if (doc.activeElement && doc.activeElement !== inputArea) {
					return;
				}
					
				inputArea.focus();
				var range = inputArea.createTextRange();
				range.moveStart("character", -inputArea.value.length);
				range.moveEnd("character", -inputArea.value.length);
				range.moveEnd("character", stateObj.end);
				range.moveStart("character", stateObj.start);
				range.select();
			}
		};
		
		this.setInputAreaSelectionStartEnd = function(){
		
			if (inputArea.selectionStart || inputArea.selectionStart === 0) {
			
				stateObj.start = inputArea.selectionStart;
				stateObj.end = inputArea.selectionEnd;
			}
			else if (doc.selection) {
				
				stateObj.text = util.fixEolChars(inputArea.value);
				
				// IE loses the selection in the textarea when buttons are
				// clicked.  On IE we cache the selection and set a flag
				// which we check for here.
				var range;
				if(wmd.ieRetardedClick && wmd.ieCachedRange) {
					range = wmd.ieCachedRange;
					wmd.ieRetardedClick = false;
				}
				else {
					range = doc.selection.createRange();
				}

				var fixedRange = util.fixEolChars(range.text);
				var marker = "\x07";
				var markedRange = marker + fixedRange + marker;
				range.text = markedRange;
				var inputText = util.fixEolChars(inputArea.value);
					
				range.moveStart("character", -markedRange.length);
				range.text = fixedRange;

				stateObj.start = inputText.indexOf(marker);
				stateObj.end = inputText.lastIndexOf(marker) - marker.length;
					
				var len = stateObj.text.length - util.fixEolChars(inputArea.value).length;
					
				if (len) {
					range.moveStart("character", -fixedRange.length);
					while (len--) {
						fixedRange += "\n";
						stateObj.end += 1;
					}
					range.text = fixedRange;
				}
					
				this.setInputAreaSelection();
			}
		};
		
		// Restore this state into the input area.
		this.restore = function(){
		
			if (stateObj.text != undefined && stateObj.text != inputArea.value) {
				inputArea.value = stateObj.text;
			}
			this.setInputAreaSelection();
			inputArea.scrollTop = stateObj.scrollTop;
		};
		
		// Gets a collection of HTML chunks from the inptut textarea.
		this.getChunks = function(){
		
			var chunk = new wmd.Chunks();
			
			chunk.before = util.fixEolChars(stateObj.text.substring(0, stateObj.start));
			chunk.startTag = "";
			chunk.selection = util.fixEolChars(stateObj.text.substring(stateObj.start, stateObj.end));
			chunk.endTag = "";
			chunk.after = util.fixEolChars(stateObj.text.substring(stateObj.end));
			chunk.scrollTop = stateObj.scrollTop;
			
			return chunk;
		};
		
		// Sets the TextareaState properties given a chunk of markdown.
		this.setChunks = function(chunk){
		
			chunk.before = chunk.before + chunk.startTag;
			chunk.after = chunk.endTag + chunk.after;
			
			if (global.isOpera) {
				chunk.before = chunk.before.replace(/\n/g, "\r\n");
				chunk.selection = chunk.selection.replace(/\n/g, "\r\n");
				chunk.after = chunk.after.replace(/\n/g, "\r\n");
			}
			
			this.start = chunk.before.length;
			this.end = chunk.before.length + chunk.selection.length;
			this.text = chunk.before + chunk.selection + chunk.after;
			this.scrollTop = chunk.scrollTop;
		};

		this.init();
	};
	
	// before: contains all the text in the input box BEFORE the selection.
	// after: contains all the text in the input box AFTER the selection.
	wmd.Chunks = function(){
	};
	
	// startRegex: a regular expression to find the start tag
	// endRegex: a regular expresssion to find the end tag
	wmd.Chunks.prototype.findTags = function(startRegex, endRegex){
	
		var chunkObj = this;
		var regex;
		
		if (startRegex) {
			
			regex = util.extendRegExp(startRegex, "", "$");
			
			this.before = this.before.replace(regex, 
				function(match){
					chunkObj.startTag = chunkObj.startTag + match;
					return "";
				});
			
			regex = util.extendRegExp(startRegex, "^", "");
			
			this.selection = this.selection.replace(regex, 
				function(match){
					chunkObj.startTag = chunkObj.startTag + match;
					return "";
				});
		}
		
		if (endRegex) {
			
			regex = util.extendRegExp(endRegex, "", "$");
			
			this.selection = this.selection.replace(regex,
				function(match){
					chunkObj.endTag = match + chunkObj.endTag;
					return "";
				});

			regex = util.extendRegExp(endRegex, "^", "");
			
			this.after = this.after.replace(regex,
				function(match){
					chunkObj.endTag = match + chunkObj.endTag;
					return "";
				});
		}
	};
	
	// If remove is false, the whitespace is transferred
	// to the before/after regions.
	//
	// If remove is true, the whitespace disappears.
	wmd.Chunks.prototype.trimWhitespace = function(remove){
	
		this.selection = this.selection.replace(/^(\s*)/, "");
		
		if (!remove) {
			this.before += re.$1;
		}
		
		this.selection = this.selection.replace(/(\s*)$/, "");
		
		if (!remove) {
			this.after = re.$1 + this.after;
		}
	};
	
	
	wmd.Chunks.prototype.addBlankLines = function(nLinesBefore, nLinesAfter, findExtraNewlines){
	
		if (nLinesBefore === undefined) {
			nLinesBefore = 1;
		}
		
		if (nLinesAfter === undefined) {
			nLinesAfter = 1;
		}
		
		nLinesBefore++;
		nLinesAfter++;
		
		var regexText;
		var replacementText;
		
		this.selection = this.selection.replace(/(^\n*)/, "");
		this.startTag = this.startTag + re.$1;
		this.selection = this.selection.replace(/(\n*$)/, "");
		this.endTag = this.endTag + re.$1;
		this.startTag = this.startTag.replace(/(^\n*)/, "");
		this.before = this.before + re.$1;
		this.endTag = this.endTag.replace(/(\n*$)/, "");
		this.after = this.after + re.$1;
		
		if (this.before) {
		
			regexText = replacementText = "";
			
			while (nLinesBefore--) {
				regexText += "\\n?";
				replacementText += "\n";
			}
			
			if (findExtraNewlines) {
				regexText = "\\n*";
			}
			this.before = this.before.replace(new re(regexText + "$", ""), replacementText);
		}
		
		if (this.after) {
		
			regexText = replacementText = "";
			
			while (nLinesAfter--) {
				regexText += "\\n?";
				replacementText += "\n";
			}
			if (findExtraNewlines) {
				regexText = "\\n*";
			}
			
			this.after = this.after.replace(new re(regexText, ""), replacementText);
		}
	};
	
	// The markdown symbols - 4 spaces = code, > = blockquote, etc.
	command.prefixes = "(?:\\s{4,}|\\s*>|\\s*-\\s+|\\s*\\d+\\.|=|\\+|-|_|\\*|#|\\s*\\[[^\n]]+\\]:)";
	
	// Remove markdown symbols from the chunk selection.
	command.unwrap = function(chunk){
		var txt = new re("([^\\n])\\n(?!(\\n|" + command.prefixes + "))", "g");
		chunk.selection = chunk.selection.replace(txt, "$1 $2");
	};
	
	command.wrap = function(chunk, len){
		command.unwrap(chunk);
		var regex = new re("(.{1," + len + "})( +|$\\n?)", "gm");
		
		chunk.selection = chunk.selection.replace(regex, function(line, marked){
			if (new re("^" + command.prefixes, "").test(line)) {
				return line;
			}
			return marked + "\n";
		});
		
		chunk.selection = chunk.selection.replace(/\s+$/, "");
	};
	
	command.doBold = function(chunk, postProcessing, useDefaultText){
		return command.doBorI(chunk, 2, "strong text");
	};
	
	command.doItalic = function(chunk, postProcessing, useDefaultText){
		return command.doBorI(chunk, 1, "emphasized text");
	};
	
	// chunk: The selected region that will be enclosed with */**
	// nStars: 1 for italics, 2 for bold
	// insertText: If you just click the button without highlighting text, this gets inserted
	command.doBorI = function(chunk, nStars, insertText){
	
		// Get rid of whitespace and fixup newlines.
		chunk.trimWhitespace();
		chunk.selection = chunk.selection.replace(/\n{2,}/g, "\n");
		
		// Look for stars before and after.  Is the chunk already marked up?
		chunk.before.search(/(\**$)/);
		var starsBefore = re.$1;
		
		chunk.after.search(/(^\**)/);
		var starsAfter = re.$1;
		
		var prevStars = Math.min(starsBefore.length, starsAfter.length);
		
		// Remove stars if we have to since the button acts as a toggle.
		if ((prevStars >= nStars) && (prevStars != 2 || nStars != 1)) {
			chunk.before = chunk.before.replace(re("[*]{" + nStars + "}$", ""), "");
			chunk.after = chunk.after.replace(re("^[*]{" + nStars + "}", ""), "");
		}
		else if (!chunk.selection && starsAfter) {
			// It's not really clear why this code is necessary.  It just moves
			// some arbitrary stuff around.
			chunk.after = chunk.after.replace(/^([*_]*)/, "");
			chunk.before = chunk.before.replace(/(\s?)$/, "");
			var whitespace = re.$1;
			chunk.before = chunk.before + starsAfter + whitespace;
		}
		else {
		
			// In most cases, if you don't have any selected text and click the button
			// you'll get a selected, marked up region with the default text inserted.
			if (!chunk.selection && !starsAfter) {
				chunk.selection = insertText;
			}
			
			// Add the true markup.
			var markup = nStars <= 1 ? "*" : "**"; // shouldn't the test be = ?
			chunk.before = chunk.before + markup;
			chunk.after = markup + chunk.after;
		}
		
		return;
	};
	
	command.stripLinkDefs = function(text, defsToAdd){
	
		text = text.replace(/^[ ]{0,3}\[(\d+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|$)/gm, 
			function(totalMatch, id, link, newlines, title){	
				defsToAdd[id] = totalMatch.replace(/\s*$/, "");
				if (newlines) {
					// Strip the title and return that separately.
					defsToAdd[id] = totalMatch.replace(/["(](.+?)[")]$/, "");
					return newlines + title;
				}
				return "";
			});
		
		return text;
	};
	
	command.addLinkDef = function(chunk, linkDef){
	
		var refNumber = 0; // The current reference number
		var defsToAdd = {}; //
		// Start with a clean slate by removing all previous link definitions.
		chunk.before = command.stripLinkDefs(chunk.before, defsToAdd);
		chunk.selection = command.stripLinkDefs(chunk.selection, defsToAdd);
		chunk.after = command.stripLinkDefs(chunk.after, defsToAdd);
		
		var defs = "";
		var regex = /(\[(?:\[[^\]]*\]|[^\[\]])*\][ ]?(?:\n[ ]*)?\[)(\d+)(\])/g;
		
		var addDefNumber = function(def){
			refNumber++;
			def = def.replace(/^[ ]{0,3}\[(\d+)\]:/, "  [" + refNumber + "]:");
			defs += "\n" + def;
		};
		
		var getLink = function(wholeMatch, link, id, end){
		
			if (defsToAdd[id]) {
				addDefNumber(defsToAdd[id]);
				return link + refNumber + end;
				
			}
			return wholeMatch;
		};
		
		chunk.before = chunk.before.replace(regex, getLink);
		
		if (linkDef) {
			addDefNumber(linkDef);
		}
		else {
			chunk.selection = chunk.selection.replace(regex, getLink);
		}
		
		var refOut = refNumber;
		
		chunk.after = chunk.after.replace(regex, getLink);
		
		if (chunk.after) {
			chunk.after = chunk.after.replace(/\n*$/, "");
		}
		if (!chunk.after) {
			chunk.selection = chunk.selection.replace(/\n*$/, "");
		}
		
		chunk.after += "\n\n" + defs;
		
		return refOut;
	};
	
	command.doLinkOrImage = function(chunk, postProcessing, isImage){
	
		chunk.trimWhitespace();
		chunk.findTags(/\s*!?\[/, /\][ ]?(?:\n[ ]*)?(\[.*?\])?/);
		
		if (chunk.endTag.length > 1) {
		
			chunk.startTag = chunk.startTag.replace(/!?\[/, "");
			chunk.endTag = "";
			command.addLinkDef(chunk, null);
			
		}
		else {
		
			if (/\n\n/.test(chunk.selection)) {
				command.addLinkDef(chunk, null);
				return;
			}
			
			// The function to be executed when you enter a link and press OK or Cancel.
			// Marks up the link and adds the ref.
			var makeLinkMarkdown = function(link){
			
				if (link !== null) {
				
					chunk.startTag = chunk.endTag = "";
					var linkDef = " [999]: " + link;
					
					var num = command.addLinkDef(chunk, linkDef);
					chunk.startTag = isImage ? "![" : "[";
					chunk.endTag = "][" + num + "]";
					
					if (!chunk.selection) {
						if (isImage) {
							chunk.selection = "alt text";
						}
						else {
							chunk.selection = "link text";
						}
					}
				}
				postProcessing();
			};
			
			if (isImage) {
				util.prompt(imageDialogText, imageDefaultText, makeLinkMarkdown);
			}
			else {
				util.prompt(linkDialogText, linkDefaultText, makeLinkMarkdown);
			}
			return true;
		}
	};
	
	util.makeAPI = function(){
		wmd.wmd = {};
		wmd.wmd.editor = wmd.editor;
		wmd.wmd.previewManager = wmd.previewManager;
	};
	
	util.startEditor = function(){
	
		if (wmd.wmd_env.autostart === false) {
			util.makeAPI();
			return;
		}

		var edit;		// The editor (buttons + input + outputs) - the main object.
		var previewMgr;	// The preview manager.
		
		// Fired after the page has fully loaded.
		var loadListener = function(){
		
			wmd.panels = new wmd.PanelCollection();
			
			previewMgr = new wmd.previewManager();
			var previewRefreshCallback = previewMgr.refresh;
						
			edit = new wmd.editor(previewRefreshCallback);
			
			previewMgr.refresh(true);
			
		};
		
		// Because we are already loading in event listener
		// we start editor now
		loadListener();
		//util.addEvent(top, "load", loadListener);
	};
	
	wmd.previewManager = function(){
		
		var managerObj = this;
		var converter;
		var poller;
		var timeout;
		var elapsedTime;
		var oldInputText;
		var htmlOut;
		var maxDelay = 3000;
		var startType = "delayed"; // The other legal value is "manual"
		
		// Adds event listeners to elements and creates the input poller.
		var setupEvents = function(inputElem, listener){
		
			util.addEvent(inputElem, "input", listener);
			inputElem.onpaste = listener;
			inputElem.ondrop = listener;
			
			util.addEvent(inputElem, "keypress", listener);
			util.addEvent(inputElem, "keydown", listener);
			// previewPollInterval is set at the top of this file.
			poller = new wmd.inputPoller(listener, previewPollInterval);
		};
		
		var getDocScrollTop = function(){
		
			var result = 0;
			
			if (top.innerHeight) {
				result = top.pageYOffset;
			}
			else 
				if (doc.documentElement && doc.documentElement.scrollTop) {
					result = doc.documentElement.scrollTop;
				}
				else 
					if (doc.body) {
						result = doc.body.scrollTop;
					}
			
			return result;
		};
		
		var makePreviewHtml = function(){
		
			// If there are no registered preview and output panels
			// there is nothing to do.
			if (!wmd.panels.preview && !wmd.panels.output) {
				return;
			}
			
			var text = wmd.panels.input.value;
			if (text && text == oldInputText) {
				return; // Input text hasn't changed.
			}
			else {
				oldInputText = text;
			}
			
			var prevTime = new Date().getTime();
			
			if (!converter && wmd.showdown) {
				converter = new wmd.showdown.converter();
			}
			
			if (converter) {
				text = converter.makeHtml(text);
			}
			
			// Calculate the processing time of the HTML creation.
			// It's used as the delay time in the event listener.
			var currTime = new Date().getTime();
			elapsedTime = currTime - prevTime;
			
			pushPreviewHtml(text);
			htmlOut = text;
		};
		
		// setTimeout is already used.  Used as an event listener.
		var applyTimeout = function(){
		
			if (timeout) {
				top.clearTimeout(timeout);
				timeout = undefined;
			}
			
			if (startType !== "manual") {
			
				var delay = 0;
				
				if (startType === "delayed") {
					delay = elapsedTime;
				}
				
				if (delay > maxDelay) {
					delay = maxDelay;
				}
				timeout = top.setTimeout(makePreviewHtml, delay);
			}
		};
		
		var getScaleFactor = function(panel){
			if (panel.scrollHeight <= panel.clientHeight) {
				return 1;
			}
			return panel.scrollTop / (panel.scrollHeight - panel.clientHeight);
		};
		
		var setPanelScrollTops = function(){
		
			if (wmd.panels.preview) {
				wmd.panels.preview.scrollTop = (wmd.panels.preview.scrollHeight - wmd.panels.preview.clientHeight) * getScaleFactor(wmd.panels.preview);
				;
			}
			
			if (wmd.panels.output) {
				wmd.panels.output.scrollTop = (wmd.panels.output.scrollHeight - wmd.panels.output.clientHeight) * getScaleFactor(wmd.panels.output);
				;
			}
		};
		
		this.refresh = function(requiresRefresh){
		
			if (requiresRefresh) {
				oldInputText = "";
				makePreviewHtml();
			}
			else {
				applyTimeout();
			}
		};
		
		this.processingTime = function(){
			return elapsedTime;
		};
		
		// The output HTML
		this.output = function(){
			return htmlOut;
		};
		
		// The mode can be "manual" or "delayed"
		this.setUpdateMode = function(mode){
			startType = mode;
			managerObj.refresh();
		};
		
		var isFirstTimeFilled = true;
		
		var pushPreviewHtml = function(text){
		
			var emptyTop = position.getTop(wmd.panels.input) - getDocScrollTop();
			
			// Send the encoded HTML to the output textarea/div.
			if (wmd.panels.output) {
				// The value property is only defined if the output is a textarea.
				if (wmd.panels.output.value !== undefined) {
					wmd.panels.output.value = text;
					wmd.panels.output.readOnly = true;
				}
				// Otherwise we are just replacing the text in a div.
				// Send the HTML wrapped in <pre><code>
				else {
					var newText = text.replace(/&/g, "&amp;");
					newText = newText.replace(/</g, "&lt;");
					wmd.panels.output.innerHTML = "<pre><code>" + newText + "</code></pre>";
				}
			}
			
			if (wmd.panels.preview) {
				wmd.panels.preview.innerHTML = text;
			}
			
			setPanelScrollTops();
			
			if (isFirstTimeFilled) {
				isFirstTimeFilled = false;
				return;
			}
			
			var fullTop = position.getTop(wmd.panels.input) - getDocScrollTop();
			
			if (global.isIE) {
				top.setTimeout(function(){
					top.scrollBy(0, fullTop - emptyTop);
				}, 0);
			}
			else {
				top.scrollBy(0, fullTop - emptyTop);
			}
		};
		
		var init = function(){
		
			setupEvents(wmd.panels.input, applyTimeout);
			makePreviewHtml();
			
			if (wmd.panels.preview) {
				wmd.panels.preview.scrollTop = 0;
			}
			if (wmd.panels.output) {
				wmd.panels.output.scrollTop = 0;
			}
		};
		
		this.destroy = function(){
			if (poller) {
				poller.destroy();
			}
		};
		
		init();
	};

	// Moves the cursor to the next line and continues lists, quotes and code.
	command.doAutoindent = function(chunk, postProcessing, useDefaultText){
		
		chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]*\n$/, "\n\n");
		chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}>[ \t]*\n$/, "\n\n");
		chunk.before = chunk.before.replace(/(\n|^)[ \t]+\n$/, "\n\n");
		
		useDefaultText = false;
		
		if(/(\n|^)[ ]{0,3}([*+-])[ \t]+.*\n$/.test(chunk.before)){
			if(command.doList){
				command.doList(chunk, postProcessing, false, true);
			}
		}
		if(/(\n|^)[ ]{0,3}(\d+[.])[ \t]+.*\n$/.test(chunk.before)){
			if(command.doList){
				command.doList(chunk, postProcessing, true, true);
			}
		}
		if(/(\n|^)[ ]{0,3}>[ \t]+.*\n$/.test(chunk.before)){
			if(command.doBlockquote){
				command.doBlockquote(chunk, postProcessing, useDefaultText);
			}
		}
		if(/(\n|^)(\t|[ ]{4,}).*\n$/.test(chunk.before)){
			if(command.doCode){
				command.doCode(chunk, postProcessing, useDefaultText);
			}
		}
	};
	
	command.doBlockquote = function(chunk, postProcessing, useDefaultText){
		
		chunk.selection = chunk.selection.replace(/^(\n*)([^\r]+?)(\n*)$/,
			function(totalMatch, newlinesBefore, text, newlinesAfter){
				chunk.before += newlinesBefore;
				chunk.after = newlinesAfter + chunk.after;
				return text;
			});
			
		chunk.before = chunk.before.replace(/(>[ \t]*)$/,
			function(totalMatch, blankLine){
				chunk.selection = blankLine + chunk.selection;
				return "";
			});
		
		var defaultText = useDefaultText ? "Blockquote" : "";
		chunk.selection = chunk.selection.replace(/^(\s|>)+$/ ,"");
		chunk.selection = chunk.selection || defaultText;
		
		if(chunk.before){
			chunk.before = chunk.before.replace(/\n?$/,"\n");
		}
		if(chunk.after){
			chunk.after = chunk.after.replace(/^\n?/,"\n");
		}
		
		chunk.before = chunk.before.replace(/(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*$)/,
			function(totalMatch){
				chunk.startTag = totalMatch;
				return "";
			});
			
		chunk.after = chunk.after.replace(/^(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*)/,
			function(totalMatch){
				chunk.endTag = totalMatch;
				return "";
			});
		
		var replaceBlanksInTags = function(useBracket){
			
			var replacement = useBracket ? "> " : "";
			
			if(chunk.startTag){
				chunk.startTag = chunk.startTag.replace(/\n((>|\s)*)\n$/,
					function(totalMatch, markdown){
						return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
					});
			}
			if(chunk.endTag){
				chunk.endTag = chunk.endTag.replace(/^\n((>|\s)*)\n/,
					function(totalMatch, markdown){
						return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
					});
			}
		};
		
		if(/^(?![ ]{0,3}>)/m.test(chunk.selection)){
			command.wrap(chunk, wmd.wmd_env.lineLength - 2);
			chunk.selection = chunk.selection.replace(/^/gm, "> ");
			replaceBlanksInTags(true);
			chunk.addBlankLines();
		}
		else{
			chunk.selection = chunk.selection.replace(/^[ ]{0,3}> ?/gm, "");
			command.unwrap(chunk);
			replaceBlanksInTags(false);
			
			if(!/^(\n|^)[ ]{0,3}>/.test(chunk.selection) && chunk.startTag){
				chunk.startTag = chunk.startTag.replace(/\n{0,2}$/, "\n\n");
			}
			
			if(!/(\n|^)[ ]{0,3}>.*$/.test(chunk.selection) && chunk.endTag){
				chunk.endTag=chunk.endTag.replace(/^\n{0,2}/, "\n\n");
			}
		}
		
		if(!/\n/.test(chunk.selection)){
			chunk.selection = chunk.selection.replace(/^(> *)/,
			function(wholeMatch, blanks){
				chunk.startTag += blanks;
				return "";
			});
		}
	};

	command.doCode = function(chunk, postProcessing, useDefaultText){
		
		var hasTextBefore = /\S[ ]*$/.test(chunk.before);
		var hasTextAfter = /^[ ]*\S/.test(chunk.after);
		
		// Use 'four space' markdown if the selection is on its own
		// line or is multiline.
		if((!hasTextAfter && !hasTextBefore) || /\n/.test(chunk.selection)){
			
			chunk.before = chunk.before.replace(/[ ]{4}$/,
				function(totalMatch){
					chunk.selection = totalMatch + chunk.selection;
					return "";
				});
				
			var nLinesBefore = 1;
			var nLinesAfter = 1;
			
			
			if(/\n(\t|[ ]{4,}).*\n$/.test(chunk.before) || chunk.after === ""){
				nLinesBefore = 0; 
			}
			if(/^\n(\t|[ ]{4,})/.test(chunk.after)){
				nLinesAfter = 0; // This needs to happen on line 1
			}
			
			chunk.addBlankLines(nLinesBefore, nLinesAfter);
			
			if(!chunk.selection){
				chunk.startTag = "    ";
				chunk.selection = useDefaultText ? "enter code here" : "";
			}
			else {
				if(/^[ ]{0,3}\S/m.test(chunk.selection)){
					chunk.selection = chunk.selection.replace(/^/gm, "    ");
				}
				else{
					chunk.selection = chunk.selection.replace(/^[ ]{4}/gm, "");
				}
			}
		}
		else{
			// Use backticks (`) to delimit the code block.
			
			chunk.trimWhitespace();
			chunk.findTags(/`/, /`/);
			
			if(!chunk.startTag && !chunk.endTag){
				chunk.startTag = chunk.endTag="`";
				if(!chunk.selection){
					chunk.selection = useDefaultText ? "enter code here" : "";
				}
			}
			else if(chunk.endTag && !chunk.startTag){
				chunk.before += chunk.endTag;
				chunk.endTag = "";
			}
			else{
				chunk.startTag = chunk.endTag="";
			}
		}
	};
	
	command.doList = function(chunk, postProcessing, isNumberedList, useDefaultText){
				
		// These are identical except at the very beginning and end.
		// Should probably use the regex extension function to make this clearer.
		var previousItemsRegex = /(\n|^)(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*$/;
		var nextItemsRegex = /^\n*(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*/;
		
		// The default bullet is a dash but others are possible.
		// This has nothing to do with the particular HTML bullet,
		// it's just a markdown bullet.
		var bullet = "-";
		
		// The number in a numbered list.
		var num = 1;
		
		// Get the item prefix - e.g. " 1. " for a numbered list, " - " for a bulleted list.
		var getItemPrefix = function(){
			var prefix;
			if(isNumberedList){
				prefix = " " + num + ". ";
				num++;
			}
			else{
				prefix = " " + bullet + " ";
			}
			return prefix;
		};
		
		// Fixes the prefixes of the other list items.
		var getPrefixedItem = function(itemText){
		
			// The numbering flag is unset when called by autoindent.
			if(isNumberedList === undefined){
				isNumberedList = /^\s*\d/.test(itemText);
			}
			
			// Renumber/bullet the list element.
			itemText = itemText.replace(/^[ ]{0,3}([*+-]|\d+[.])\s/gm,
				function( _ ){
					return getItemPrefix();
				});
				
			return itemText;
		};
		
		chunk.findTags(/(\n|^)*[ ]{0,3}([*+-]|\d+[.])\s+/, null);
		
		if(chunk.before && !/\n$/.test(chunk.before) && !/^\n/.test(chunk.startTag)){
			chunk.before += chunk.startTag;
			chunk.startTag = "";
		}
		
		if(chunk.startTag){
			
			var hasDigits = /\d+[.]/.test(chunk.startTag);
			chunk.startTag = "";
			chunk.selection = chunk.selection.replace(/\n[ ]{4}/g, "\n");
			command.unwrap(chunk);
			chunk.addBlankLines();
			
			if(hasDigits){
				// Have to renumber the bullet points if this is a numbered list.
				chunk.after = chunk.after.replace(nextItemsRegex, getPrefixedItem);
			}
			if(isNumberedList == hasDigits){
				return;
			}
		}
		
		var nLinesBefore = 1;
		
		chunk.before = chunk.before.replace(previousItemsRegex,
			function(itemText){
				if(/^\s*([*+-])/.test(itemText)){
					bullet = re.$1;
				}
				nLinesBefore = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
				return getPrefixedItem(itemText);
			});
			
		if(!chunk.selection){
			chunk.selection = useDefaultText ? "List item" : " ";
		}
		
		var prefix = getItemPrefix();
		
		var nLinesAfter = 1;
		
		chunk.after = chunk.after.replace(nextItemsRegex,
			function(itemText){
				nLinesAfter = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
				return getPrefixedItem(itemText);
			});
			
		chunk.trimWhitespace(true);
		chunk.addBlankLines(nLinesBefore, nLinesAfter, true);
		chunk.startTag = prefix;
		var spaces = prefix.replace(/./g, " ");
		command.wrap(chunk, wmd.wmd_env.lineLength - spaces.length);
		chunk.selection = chunk.selection.replace(/\n/g, "\n" + spaces);
		
	};
	
	command.doHeading = function(chunk, postProcessing, useDefaultText){
		
		// Remove leading/trailing whitespace and reduce internal spaces to single spaces.
		chunk.selection = chunk.selection.replace(/\s+/g, " ");
		chunk.selection = chunk.selection.replace(/(^\s+|\s+$)/g, "");
		
		// If we clicked the button with no selected text, we just
		// make a level 2 hash header around some default text.
		if(!chunk.selection){
			chunk.startTag = "## ";
			chunk.selection = "Heading";
			chunk.endTag = " ##";
			return;
		}
		
		var headerLevel = 0;		// The existing header level of the selected text.
		
		// Remove any existing hash heading markdown and save the header level.
		chunk.findTags(/#+[ ]*/, /[ ]*#+/);
		if(/#+/.test(chunk.startTag)){
			headerLevel = re.lastMatch.length;
		}
		chunk.startTag = chunk.endTag = "";
		
		// Try to get the current header level by looking for - and = in the line
		// below the selection.
		chunk.findTags(null, /\s?(-+|=+)/);
		if(/=+/.test(chunk.endTag)){
			headerLevel = 1;
		}
		if(/-+/.test(chunk.endTag)){
			headerLevel = 2;
		}
		
		// Skip to the next line so we can create the header markdown.
		chunk.startTag = chunk.endTag = "";
		chunk.addBlankLines(1, 1);

		// We make a level 2 header if there is no current header.
		// If there is a header level, we substract one from the header level.
		// If it's already a level 1 header, it's removed.
		var headerLevelToCreate = headerLevel == 0 ? 2 : headerLevel - 1;
		
		if(headerLevelToCreate > 0){
			
			// The button only creates level 1 and 2 underline headers.
			// Why not have it iterate over hash header levels?  Wouldn't that be easier and cleaner?
			var headerChar = headerLevelToCreate >= 2 ? "-" : "=";
			var len = chunk.selection.length;
			if(len > wmd.wmd_env.lineLength){
				len = wmd.wmd_env.lineLength;
			}
			chunk.endTag = "\n";
			while(len--){
				chunk.endTag += headerChar;
			}
		}
	};	
	
	command.doHorizontalRule = function(chunk, postProcessing, useDefaultText){
		chunk.startTag = "----------\n";
		chunk.selection = "";
		chunk.addBlankLines(2, 1, true);
	}
};


Attacklab.wmd_env = {};
Attacklab.account_options = {};
Attacklab.wmd_defaults = {version:1, output:"Markdown", lineLength:40, delayLoad:false};

if(!Attacklab.wmd)
{
	Attacklab.wmd = function()
	{
		Attacklab.loadEnv = function()
		{
			var mergeEnv = function(env)
			{
				if(!env)
				{
					return;
				}
			
				for(var key in env)
				{
					Attacklab.wmd_env[key] = env[key];
				}
			};
			
			mergeEnv(Attacklab.wmd_defaults);
			mergeEnv(Attacklab.account_options);
			mergeEnv(top["wmd_options"]);
			Attacklab.full = true;
			
			var defaultButtons = "bold italic link blockquote code image ol ul heading hr";
			Attacklab.wmd_env.buttons = Attacklab.wmd_env.buttons || defaultButtons;
		};
		Attacklab.loadEnv();

	};
	
	Attacklab.wmd();
	Attacklab.wmdBase();
	Attacklab.Util.startEditor();
};
}