add: if (!this._enabled) return; 
context:     _mainMenuMouseOver: function(event) {        var overItem = tw_getEventTarget(event, "menuItem");                if (overItem == null) {            var overItem = tw_getEventTarget(event, "mainMenuItem");                            var mainMenu = overItem.parentNode;                            for (var i = mainMenu.childNodes.length - 1; i >= 0; i--) {                var item = mainMenu.childNodes.item(i);                                if (item === overItem) {                    this._setHighlight(item, true);                    if (this._menusAreVisible) this._open(item);                } else {                    this._setHighlight(item, false);                    this.close(item);                }            }        }    },
meta: 5515	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5515/37796fea05d0eb86951d2f34aedeb66e8b500920/Menu.js/buggy/src/thinwire/render/web/resources/Menu.js