"

From 2010.igem.org

/**

* 
* 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; } };