'mouseenter .ui-menu-item': function (event) {
                var target = $(event.currentTarget),
                    submenu = this.options.menus,
                    ulElement,
                    ulElementWidth,
                    width,
                    targetPageX,
                    rightBound;

                if (target.has(submenu)) {
                    ulElement = target.find(submenu);

                    if (ulElement[0] && !ulElement[0].classList.contains('level0')) {
                    var cssTop = event.target.offsetTop,
                        ele = $(ulElement[0]);
                    window.setTimeout(function () {
                        ele.css('top', cssTop).animate({top: cssTop}, 20);
                        }, this.options.delay-10);
                    }

                    ulElementWidth = ulElement.outerWidth(true);
                    width = target.outerWidth() * 2;
                    targetPageX = target.offset().left;
                    rightBound = $(window).width();

                    if (ulElementWidth + width + targetPageX > rightBound) {
                        ulElement.addClass('submenu-reverse');
                    }

                    if (targetPageX - ulElementWidth < 0) {
                        ulElement.removeClass('submenu-reverse');
                    }
                }

                // Remove ui-state-active class from siblings of the newly focused menu item
                // to avoid a jump caused by adjacent elements both having a class with a border
                target.siblings().children('.ui-state-active').removeClass('ui-state-active');
                this.focus(event, target);
            },