/*! 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;
	                        this.onmousewheel = null;
	        },
	       
	        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);