(function($){
    var types = ['DOMMouseScroll', 'mousewheel'];

    $.event.special.mousewheel = {
        setup: function(){
            if (this.addEventListener)
                for (var i = types.length; i;)
                    this.addEventListener(types[--i], handler, false);
            else
                this.onmousewheel = handler;
        },

        teardown: function(){
            if (this.removeEventListener)
                for (var i = types.length; i;)
                    this.removeEventListener(types[--i], handler, false);
            else
                this.onmousewheel = null;
        }
    };

    $.fn.extend({
        mousewheel: function(fn){
            return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
        },

        unmousewheel: function(fn){
            return this.unbind("mousewheel", fn);
        }
    });


    function handler(event){
        var args = [].slice.call(arguments, 1), delta = 0, returnValue = true;

        event = $.event.fix(event || window.event);
        event.type = "mousewheel";

        if (event.wheelDelta)
            delta = event.wheelDelta / 120;
        if (event.detail)
            delta = -event.detail / 3;

        // Add events and delta to the front of the arguments
        args.unshift(event, delta);

        return $.event.handle.apply(this, args);
    }
})(jQuery);