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        quote: "Blockquote <blockquote> Ctrl+Q",
        quoteexample: "Blockquote",

        code: "Code Sample <pre><code> Ctrl+K",
        codeexample: "enter code here",

        image: "Image <img> Ctrl+G",
        imagedescription: "enter image description here",
        imagedialog: "<p><b>Insert Image</b></p><p>http://example.com/images/diagram.jpg \"optional title\"<br><br>Need <a href='http://www.google.com/search?q=free+image+hosting' target='_blank'>free image hosting?</a></p>",

        olist: "Numbered List <ol> Ctrl+O",
        ulist: "Bulleted List <ul> Ctrl+U",
        litem: "List item",

        heading: "Heading <h1>/<h2> Ctrl+H",
        headingexample: "Heading",

        hr: "Horizontal Rule <hr> Ctrl+R",

        undo: "Undo - Ctrl+Z",
        redo: "Redo - Ctrl+Y",
        redomac: "Redo - Ctrl+Shift+Z",

        help: "Markdown Editing Help"
    };


    // -------------------------------------------------------------------
    //  YOUR CHANGES GO HERE
    //
    // I've tried to localize the things you are likely to change to
    // this area.
    // -------------------------------------------------------------------

    // The default text that appears in the dialog input box when entering
    // links.
    var imageDefaultText = "http://";
    var linkDefaultText = "http://";

    // -------------------------------------------------------------------
    //  END OF YOUR CHANGES
    // -------------------------------------------------------------------

    // options, if given, can have the following properties:
    //   options.helpButton = { handler: yourEventHandler }
    //   options.strings = { italicexample: "slanted text" }
    // `yourEventHandler` is the click handler for the help button.
    // If `options.helpButton` isn't given, not help button is created.
    // `options.strings` can have any or all of the same properties as
    // `defaultStrings` above, so you can just override some string displayed
    // to the user on a case-by-case basis, or translate all strings to
    // a different language.
    //
    // For backwards compatibility reasons, the `options` argument can also
    // be just the `helpButton` object, and `strings.help` can also be set via
    // `helpButton.title`. This should be considered legacy.
    //
    // The constructed editor object has the methods:
    // - getConverter() returns the markdown converter object that was passed to the constructor
    // - run() actually starts the editor; should be called after all necessary plugins are registered. Calling this more than once is a no-op.
    // - refreshPreview() forces the preview to be updated. This method is only available after run() was called.
    Markdown.Editor = function (markdownConverter, idPostfix, options) {
        
        options = options || {};

        if (typeof options.handler === "function") { //backwards compatible behavior
            options = { helpButton: options };
        }
        options.strings = options.strings || {};
        if (options.helpButton) {
            options.strings.help = options.strings.help || options.helpButton.title;
        }
        var getString = function (identifier) { return options.strings[identifier] || defaultsStrings[identifier]; }

        idPostfix = idPostfix || "";

        var hooks = this.hooks = new Markdown.HookCollection();
        hooks.addNoop("onPreviewRefresh");       // called with no arguments after the preview has been refreshed
        hooks.addNoop("postBlockquoteCreation"); // called with the user's selection *after* the blockquote was created; should return the actual to-be-inserted text
        hooks.addFalse("insertImageDialog");     /* called with one parameter: a callback to be called with the URL of the image. If the application creates
                                                  * its own image insertion dialog, this hook should return true, and the callback should be called with the chosen
                                                  * image url (or null if the user cancelled). If this hook returns false, the default dialog will be used.
                                                  */

        this.getConverter = function () { return markdownConverter; }

        var that = this,
            panels;

        this.run = function () {
            if (panels)
                return; // already initialized

            panels = new PanelCollection(idPostfix);
            var commandManager = new CommandManager(hooks, getString);
            var previewManager = new PreviewManager(markdownConverter, panels, function () { hooks.onPreviewRefresh(); });
            var undoManager, uiManager;

            if (!/\?noundo/.test(doc.location.href)) {
                undoManager = new UndoManager(function () {
                    previewManager.refresh();
                    if (uiManager) // not available on the first call
                        uiManager.setUndoRedoButtonStates();
                }, panels);
                this.textOperation = function (f) {
                    undoManager.setCommandMode();
                    f();
                    that.refreshPreview();
                }
            }

            uiManager = new UIManager(idPostfix, panels, undoManager, previewManager, commandManager, options.helpButton, getString);
            uiManager.setUndoRedoButtonStates();

            var forceRefresh = that.refreshPreview = function () { previewManager.refresh(true); };

            forceRefresh();
        };

    }