var Dir ="C:\\";
  var nsLocalFile = Components.Constructor("@mozilla.org/file/local;1",
                                           "nsILocalFile", "initWithPath");
  new nsLocalFile(Dir).reveal();
  
  this. insertText (this. value);

var menu = <menupopup xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
              oncommand="this.parentNode.handleMenuCommand(event)">
    <toolbarbutton value="¤"/>
    <toolbarbutton value="¦"/>
    <toolbarbutton value="§"/>
    <toolbarbutton value="©"/>
    <toolbarbutton value="«"/>
    <toolbarbutton value="»"/>
    <toolbarbutton value="¬"/>
    <toolbarbutton value="®"/>
    <toolbarbutton value="°"/>
    <toolbarbutton value="±"/>
    <toolbarbutton value="µ"/>
    <toolbarbutton value="¶"/>
    <toolbarbutton value="—"/>
    <toolbarbutton value="‘"/>
    <toolbarbutton value="’"/>
    <toolbarbutton value="“"/>
    <toolbarbutton value="”"/>
    <toolbarbutton value="•"/>
    <toolbarbutton value="‰"/>
    <toolbarbutton value="‹"/>
    <toolbarbutton value="›"/>
    <toolbarbutton value="™"/>
</menupopup>;

menu = custombuttonsUtils. makeXML (menu);
this. appendChild (menu);
this. value = menu. firstChild. getAttribute ("value");

this. makePNG = function (text, height)
{
    var h = height;
    var cw = 24, ch = 24;
    var canvas = <canvas xmlns="http://www.w3.org/1999/xhtml" width={cw} height={ch} style="display:none;"></canvas>;
    cw -= 2;
    ch -= 2;
    canvas = custombuttonsUtils. makeXML (canvas);
    this. appendChild (canvas);
    var ctxt = canvas. getContext ("2d");
    ctxt. clearRect (0, 0, cw, ch);
    ctxt. font = h + "pt times bold"
    var m = ctxt. measureText (text);
    m = (cw - m. width) / 2.0;
    h = ch - (ch - h) / 2.0;
    ctxt. fillText (text, m, h);
    var uri = canvas. toDataURL ("image/png", "");
    this. removeChild (canvas);
    return uri;
};

this. image = this. makePNG (this. value, 16);

var mi, val;
for (var i = 0; i < menu. childNodes. length; i++)
{
    mi = menu. childNodes [i];
    val = mi. getAttribute ("value");
    val = this. makePNG (val, 12);
    mi. setAttribute ("image", val);
}

this. insertText = function (text)
{
    var command = "cmd_insertText";
    var controller = document. commandDispatcher. getControllerForCommand (command);
    if (controller && controller. isCommandEnabled (command))
    {
            controller = controller. QueryInterface (Components. interfaces. nsICommandController);
        var params = Components. classes ["@mozilla.org/embedcomp/command-params;1"].
                 createInstance (Components. interfaces. nsICommandParams);
        params. setStringValue ("state_data", text);
        controller. doCommandWithParams (command, params);
    }
};

this. handleMenuCommand = function (event)
{
    event. stopPropagation ();
    var mi = event. originalTarget;
    var text = mi. getAttribute ("value");
    this. image = this. makePNG (text, 16);
    this. value = text;
    this. insertText (text);
};

this. type = "menu-button";