function(keyMap) {
            
            var _this           = this;
            var cm              = this.cm;
            var settings        = this.settings;
            var toolbarHandlers = editormd.toolbarHandlers;
            var disabledKeyMaps = settings.disabledKeyMaps;
            
            keyMap              = keyMap || null;
            
            if (keyMap)
            {
                for (var i in keyMap)
                {
                    if ($.inArray(i, disabledKeyMaps) < 0)
                    {
                        var map = {};
                        map[i]  = keyMap[i];

                        cm.addKeyMap(keyMap);
                    }
                }
            }
            else
            {
                for (var k in editormd.keyMaps)
                {
                    var _keyMap = editormd.keyMaps[k];
                    var handle = (typeof _keyMap === "string") ? $.proxy(toolbarHandlers[_keyMap], _this) : $.proxy(_keyMap, _this);
                    
                    if ($.inArray(k, ["F9", "F10", "F11"]) < 0 && $.inArray(k, disabledKeyMaps) < 0)
                    {
                        var _map = {};
                        _map[k] = handle;

                        cm.addKeyMap(_map);
                    }
                }
                
                $(window).keydown(function(event) {
                    
                    var keymaps = {
                        "120" : "F9",
                        "121" : "F10",
                        "122" : "F11"
                    };
                    
                    if ( $.inArray(keymaps[event.keyCode], disabledKeyMaps) < 0 )
                    {
                        switch (event.keyCode)
                        {
                            case 120:
                                    $.proxy(toolbarHandlers["watch"], _this)();
                                    return false;
                                break;
                                
                            case 121:
                                    $.proxy(toolbarHandlers["preview"], _this)();
                                    return false;
                                break;
                                
                            case 122:
                                    $.proxy(toolbarHandlers["fullscreen"], _this)();                        
                                    return false;
                                break;
                                
                            default:
                                break;
                        }
                    }
                });
            }

            return this;
        }