(function($) {
    $.event.special.mousewheel = { setup: function() {
        var handler = $.event.special.mousewheel.handler; if ($.browser.mozilla)
            $(this).bind('mousemove.mousewheel', function(event) { $.data(this, 'mwcursorposdata', { pageX: event.pageX, pageY: event.pageY, clientX: event.clientX, clientY: event.clientY }); }); if (this.addEventListener)
            this.addEventListener(($.browser.mozilla ? 'DOMMouseScroll' : 'mousewheel'), handler, false); else
            this.onmousewheel = handler;
    }, teardown: function() {
        var handler = $.event.special.mousewheel.handler; $(this).unbind('mousemove.mousewheel'); if (this.removeEventListener)
            this.removeEventListener(($.browser.mozilla ? 'DOMMouseScroll' : 'mousewheel'), handler, false); else
            this.onmousewheel = function() { }; $.removeData(this, 'mwcursorposdata');
    }, handler: function(event) { var args = Array.prototype.slice.call(arguments, 1); event = $.event.fix(event || window.event); $.extend(event, $.data(this, 'mwcursorposdata') || {}); var delta = 0, returnValue = true; if (event.wheelDelta) delta = event.wheelDelta / 120; if (event.detail) delta = -event.detail / 3; if ($.browser.opera) delta = -event.wheelDelta; event.data = event.data || {}; event.type = "mousewheel"; args.unshift(delta); args.unshift(event); return $.event.handle.apply(this, args); } 
    }; $.fn.extend({ mousewheel: function(fn) { return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel"); }, unmousewheel: function(fn) { return this.unbind("mousewheel", fn); } });
})(jQuery);