/**  *   * credits for this plugin go to brandonaaron.net  *     * unfortunately his site is down  *   * @param {Object} up  * @param {Object} down  * @param {Object} preventDefault  */ jQuery.fn.extend({   mousewheel: function(up, down, preventDefault) {     return this.hover(       function() {         jQuery.event.mousewheel.giveFocus(this, up, down, preventDefault);       },       function() {         jQuery.event.mousewheel.removeFocus(this);       }     );   },   mousewheeldown: function(fn, preventDefault) {     return this.mousewheel(function(){}, fn, preventDefault);   },   mousewheelup: function(fn, preventDefault) {     return this.mousewheel(fn, function(){}, preventDefault);   },   unmousewheel: function() {     return this.each(function() {       jQuery(this).unmouseover().unmouseout();       jQuery.event.mousewheel.removeFocus(this);     });   },   unmousewheeldown: jQuery.fn.unmousewheel,   unmousewheelup: jQuery.fn.unmousewheel });   jQuery.event.mousewheel = {   giveFocus: function(el, up, down, preventDefault) {     if (el._handleMousewheel) jQuery(el).unmousewheel();          if (preventDefault == window.undefined && down && down.constructor != Function) {       preventDefault = down;       down = null;     }          el._handleMousewheel = function(event) {       if (!event) event = window.event;       if (preventDefault)         if (event.preventDefault) event.preventDefault();         else event.returnValue = false;       var delta = 0;       if (event.wheelDelta) {         delta = event.wheelDelta/120;         if (window.opera) delta = -delta;       } else if (event.detail) {         delta = -event.detail/3;       }       if (up && (delta > 0 || !down))         up.apply(el, [event, delta]);       else if (down && delta < 0)         down.apply(el, [event, delta]);     };          if (window.addEventListener)       window.addEventListener('DOMMouseScroll', el._handleMousewheel, false);     window.onmousewheel = document.onmousewheel = el._handleMousewheel;   },      removeFocus: function(el) {     if (!el._handleMousewheel) return;          if (window.removeEventListener)       window.removeEventListener('DOMMouseScroll', el._handleMousewheel, false);     window.onmousewheel = document.onmousewheel = null;     el._handleMousewheel = null;   } };