/*! 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);