Bookmarklet to replace a textarea with a code editor

gistfile1.js

javascript: function loadScripts(array, callback) {
    var loader = function(src, handler) {
        var script = document.createElement("script");
        script.src = src;
        script.onload = script.onreadystatechange = function() {
            script.onreadystatechange = script.onload = null;
            handler();
        };
        var head = document.getElementsByTagName("head")[0];
        (head || document.body).appendChild(script);
    };
    (function() {
        if (array.length != 0) {
            loader(array.shift(), arguments.callee);
        } else {
            callback && callback();
        }
    })();
};
loadScripts(["http://code.jquery.com/jquery.js", "http://d1n0x3qji82z53.cloudfront.net/src-min-noconflict/ace.js"], function() {
    $e = $('<div id="myeditor">');
    $e.css({
        position: 'absolute',
        left: 0,
        right: 0,
        bottom: 0,
        top: '200px',
        widht: '100%',
        'z-index': 11
    }); /*        $e.height('500px').width('100%');*/ /*$('#x-form-el-modx-template-content')*/
    $('body').append($e); /* var textarea = $('#modx-template-content');*/
    var textarea = $('textarea:focus');
    if (!textarea.length) {
        alert("please select a textarea");
        return;
    };
    textarea.hide();
    var editor = ace.edit("myeditor");
    editor.setTheme("ace/theme/monokai");
    editor.getSession().setMode("ace/mode/php");
    editor.getSession().setValue(textarea.val());
    editor.getSession().on('change', function() {
        textarea.val(editor.getSession().getValue());
    });
});