// fix placeholder URLS - remove absolute paths that IE adds
    if (tagName == 'img') { tagBody = tagBody.replace(/(src\s*=\s*.)[^*]*(\*\*\*)/, "$1$2"); }
    if (tagName == 'a')   { tagBody = tagBody.replace(/(href\s*=\s*.)[^*]*(\*\*\*)/, "$1$2"); }

    // add additional tag filtering here

    // convert to vbCode
//    if      (tagName == 'b' || tagName == 'strong') {
//      if (closingTag) { tagBody = "[/b]"; } else { tagBody = "[b]"; }
//    }
//    else if (tagName == 'i' || tagName == 'em') {
//      if (closingTag) { tagBody = "[/i]"; } else { tagBody = "[i]"; }
//    }
//    else if (tagName == 'u') {
//      if (closingTag) { tagBody = "[/u]"; } else { tagBody = "[u]"; }
//    }
//    else {
//      tagBody = ""; // disallow all other tags!
//    }

    return tagBody;
  };

  // match tags and call filterTag
  RegExp.lastIndex = 0;
    var matchTag = /<\/?(\w+)((?:[^'">]*|'[^']*'|"[^"]*")*)>/g;   // this will match tags, but still doesn't handle container tags (textarea, comments, etc)

  contents = contents.replace(matchTag, filterTag);

  // remove nextlines from output (if requested)
  if (config.replaceNextlines) {
    contents = contents.replace(/\r\n/g, ' ');
    contents = contents.replace(/\n/g, ' ');
    contents = contents.replace(/\r/g, ' ');
  }

  // update output with filtered content
  document.all[objname].value = contents;

}

/* ---------------------------------------------------------------------- *\
  Function    : editor_setmode
  Description : change mode between WYSIWYG and HTML editor
  Usage       : editor_setmode(objname, mode);
  Arguments   : objname - button id string with editor and action name
                mode      - init, textedit, or wysiwyg
\* ---------------------------------------------------------------------- */

function editor_setmode(objname, mode) {
  var config     = document.all[objname].config;
  var editor_obj = document.all["_" +objname + "_editor"];

  // wait until document is fully loaded
  if (document.readyState != 'complete') {
    setTimeout(function() { editor_setmode(objname,mode) }, 25);
    return;
  }

  // define different editors
  var TextEdit   = '<textarea ID="_' +objname + '_editor" style="width:' +editor_obj.style.width+ '; height:' +editor_obj.style.height+ '; margin-top: -1px; margin-bottom: -1px;"></textarea>';
  var RichEdit   = '<iframe ID="_' +objname+ '_editor"    style="width:' +editor_obj.style.width+ '; height:' +editor_obj.style.height+ ';"></iframe>';

 // src="' +_editor_url+ 'popups/blank.html"

  //
  // Switch to TEXTEDIT mode
  //

  if (mode == "textedit" || editor_obj.tagName.toLowerCase() == 'iframe') {
    config.mode = "textedit";
    var editdoc = editor_obj.contentWindow.document;
    var contents = editdoc.body.createTextRange().htmlText;
    editor_obj.outerHTML = TextEdit;
    editor_obj = document.all["_" +objname + "_editor"];
    editor_obj.value = contents;
    editor_event(objname);

    editor_updateToolbar(objname, "disable");  // disable toolbar items

    // set event handlers
    editor_obj.onkeydown   = function() { editor_event(objname); }
    editor_obj.onkeypress  = function() { editor_event(objname); }
    editor_obj.onkeyup     = function() { editor_event(objname); }
    editor_obj.onmouseup   = function() { editor_event(objname); }
    editor_obj.ondrop      = function() { editor_event(objname, 100); }     // these events fire before they occur
    editor_obj.oncut       = function() { editor_event(objname, 100); }
    editor_obj.onpaste     = function() { editor_event(objname, 100); }
    editor_obj.onblur      = function() { editor_event(objname, -1); }

    editor_updateOutput(objname);
    editor_focus(editor_obj);
  }

  //
  // Switch to WYSIWYG mode
  //

  else {
    config.mode = "wysiwyg";
    var contents = editor_obj.value;
    if (mode == 'init') { contents = document.all[objname].value; } // on init use original textarea content

    // create editor
    editor_obj.outerHTML = RichEdit;
    editor_obj = document.all["_" +objname + "_editor"];

    // get iframe document object

    // create editor contents (and default styles for editor)
    var html = "";
    html += '<html><head>\n';
    if (config.stylesheet) {
      html += '<link href="' +config.stylesheet+ '" rel="stylesheet" type="text/css">\n';
    }
    html += '<style>\n';
    html += 'body {' +config.bodyStyle+ '} \n';
    for (var i in config.fontstyles) {
      var fontstyle = config.fontstyles[i];
      if (fontstyle.classStyle) {
        html += '.' +fontstyle.className+ ' {' +fontstyle.classStyle+ '}\n';
      }
    }
    html += '</style>\n'
      + '</head>\n'
      + '<body contenteditable="true" topmargin=1 leftmargin=1'

// still working on this
//      + ' oncontextmenu="parent.editor_cMenu_generate(window,\'' +objname+ '\');"'
      +'>'
      + contents
      + '</body>\n'
      + '</html>\n';

    // write to editor window
    var editdoc = editor_obj.contentWindow.document;

    editdoc.open();
    editdoc.write(html);
    editdoc.close();

    editor_updateToolbar(objname, "enable");  // enable toolbar items

    // store objname under editdoc
    editdoc.objname = objname;

    // set event handlers
    editdoc.onkeydown      = function() { editor_event(objname); }
    editdoc.onkeypress     = function() { editor_event(objname); }
    editdoc.onkeyup        = function() { editor_event(objname); }
    editdoc.onmouseup      = function() { editor_event(objname); }
    editdoc.body.ondrop    = function() { editor_event(objname, 100); }     // these events fire before they occur
    editdoc.body.oncut     = function() { editor_event(objname, 100); }
    editdoc.body.onpaste   = function() { editor_event(objname, 100); }
    editdoc.body.onblur    = function() { editor_event(objname, -1); }

    // bring focus to editor
    if (mode != 'init') {             // don't focus on page load, only on mode switch
      editor_focus(editor_obj);
    }

  }

  // Call update UI
  if (mode != 'init') {             // don't update UI on page load, only on mode switch
    editor_event(objname);
  }

}

/* ---------------------------------------------------------------------- *\
  Function    : editor_focus
  Description : bring focus to the editor
  Usage       : editor_focus(editor_obj);
  Arguments   : editor_obj - editor object
\* ---------------------------------------------------------------------- */

function editor_focus(editor_obj) {

  // check editor mode
  if (editor_obj.tagName.toLowerCase() == 'textarea') {         // textarea
    var myfunc = function() { editor_obj.focus(); };
    setTimeout(myfunc,100);                                     // doesn't work all the time without delay
  }

  else {                                                        // wysiwyg
    var editdoc = editor_obj.contentWindow.document;            // get iframe editor document object
    var editorRange = editdoc.body.createTextRange();           // editor range
    var curRange    = editdoc.selection.createRange();          // selection range

    if (curRange.length == null &&                              // make sure it's not a controlRange
        !editorRange.inRange(curRange)) {                       // is selection in editor range
      editorRange.collapse();                                   // move to start of range
      editorRange.select();                                     // select
      curRange = editorRange;
    }
  }

}

/* ---------------------------------------------------------------------- *\
  Function    : editor_about
  Description : display "about this editor" popup
\* ---------------------------------------------------------------------- */

function editor_about(objname) {
  showModalDialog(_editor_url + "popups/about.html", window, "resizable: yes; help: no; status: no; scroll: no; ");
}

/* ---------------------------------------------------------------------- *\
  Function    : _dec_to_rgb
  Description : convert dec color value to rgb hex
  Usage       : var hex = _dec_to_rgb('65535');   // returns FFFF00
  Arguments   : value   - dec value
\* ---------------------------------------------------------------------- */

function _dec_to_rgb(value) {
  var hex_string = "";
  for (var hexpair = 0; hexpair < 3; hexpair++) {
    var myByte = value & 0xFF;            // get low byte
    value >>= 8;                        // drop low byte
    var nybble2 = myByte & 0x0F;          // get low nybble (4 bits)
    var nybble1 = (myByte >> 4) & 0x0F;   // get high nybble
    hex_string += nybble1.toString(16); // convert nybble to hex
    hex_string += nybble2.toString(16); // convert nybble to hex
  }
  return hex_string.toUpperCase();
}

/* ---------------------------------------------------------------------- *\
  Function    : editor_insertHTML
  Description : insert string at current cursor position in editor.  If
                two strings are specifed, surround selected text with them.
  Usage       : editor_insertHTML(objname, str1, [str2], reqSelection)
  Arguments   : objname - ID of textarea
                str1 - HTML or text to insert
                str2 - HTML or text to insert (optional argument)
                reqSelection - (1 or 0) give error if no text selected
\* ---------------------------------------------------------------------- */

function editor_insertHTML(objname, str1,str2, reqSel) {
  var config     = document.all[objname].config;
  var editor_obj = document.all["_" +objname + "_editor"];    // editor object
  if (str1 == null) { str1 = ''; }
  if (str2 == null) { str2 = ''; }

  // for non-wysiwyg capable browsers just add to end of textbox
  if (document.all[objname] && editor_obj == null) {
    document.all[objname].focus();
    document.all[objname].value = document.all[objname].value + str1 + str2;
    return;
  }

  // error checking
  if (editor_obj == null) { return alert("Unable to insert HTML.  Invalid object name '" +objname+ "'."); }

  editor_focus(editor_obj);

  var tagname = editor_obj.tagName.toLowerCase();
  var sRange;

 // insertHTML for wysiwyg iframe
  if (tagname == 'iframe') {
    var editdoc = editor_obj.contentWindow.document;
    sRange  = editdoc.selection.createRange();
    var sHtml   = sRange.htmlText;

    // check for control ranges
    if (sRange.length) { return alert("Unable to insert HTML.  Try highlighting content instead of selecting it."); }

    // insert HTML
    var oldHandler = window.onerror;
    window.onerror = function() { alert("Unable to insert HTML for current selection."); return true; } // partial table selections cause errors
    if (sHtml.length) {                                 // if content selected
      if (str2) { sRange.pasteHTML(str1 +sHtml+ str2) } // surround
      else      { sRange.pasteHTML(str1); }             // overwrite
    } else {                                            // if insertion point only
      if (reqSel) { return alert("Unable to insert HTML.  You must select something first."); }
      sRange.pasteHTML(str1 + str2);                    // insert strings
    }
    window.onerror = oldHandler;
  }

  // insertHTML for plaintext textarea
  else if (tagname == 'textarea') {
    editor_obj.focus();
    sRange  = document.selection.createRange();
    var sText   = sRange.text;

    // insert HTML
    if (sText.length) {                                 // if content selected
      if (str2) { sRange.text = str1 +sText+ str2; }  // surround
      else      { sRange.text = str1; }               // overwrite
    } else {                                            // if insertion point only
      if (reqSel) { return alert("Unable to insert HTML.  You must select something first."); }
      sRange.text = str1 + str2;                        // insert strings
    }
  }
  else { alert("Unable to insert HTML.  Unknown object tag type '" +tagname+ "'."); }

  // move to end of new content
  sRange.collapse(false); // move to end of range
  sRange.select();        // re-select

}

/* ---------------------------------------------------------------------- *\
  Function    : editor_getHTML
  Description : return HTML contents of editor (in either wywisyg or html mode)
  Usage       : var myHTML = editor_getHTML('objname');
\* ---------------------------------------------------------------------- */

function editor_getHTML(objname) {