/*! Copyright (c) 2009 Brandon Aaron (http://brandonaaron.net)
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
* Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
* Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
*
* Version: 3.0.2
*
* Requires: 1.2.2+
*/

(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);