/* Copyright (c) 2006 Brandon Aaron (brandon.aaron@gmail.com || http://brandonaaron.net)
2	 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
3	 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
4	 * Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
5	 * Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
6	 *
7	 * $LastChangedDate$
8	 * $Rev$
9	 *
10	 * Version: @VERSION
11	 *
12	 * Requires: $ 1.2.2+
13	 */
	
	(function($) {
	
	$.event.special.mousewheel = {
	    setup: function() {
	        var handler = $.event.special.mousewheel.handler;
	       
	        // Fix pageX, pageY, clientX and clientY for mozilla
	        if ( $.browser.mozilla )
	            $(this).bind('mousemove.mousewheel', function(event) {
	                $.data(this, 'mwcursorposdata', {
	                    pageX: event.pageX,
	                    pageY: event.pageY,
	                    clientX: event.clientX,
	                    clientY: event.clientY
	                });
	            });
	   
	        if ( this.addEventListener )
	            this.addEventListener( ($.browser.mozilla ? 'DOMMouseScroll' : 'mousewheel'), handler, false);
	        else
	            this.onmousewheel = handler;
	    },
	   
	    teardown: function() {
	        var handler = $.event.special.mousewheel.handler;
	       
	        $(this).unbind('mousemove.mousewheel');
	       
	        if ( this.removeEventListener )
	            this.removeEventListener( ($.browser.mozilla ? 'DOMMouseScroll' : 'mousewheel'), handler, false);
	        else
	            this.onmousewheel = function(){};
	       
	        $.removeData(this, 'mwcursorposdata');
	    },
	   
	    handler: function(event) {
	        var args = Array.prototype.slice.call( arguments, 1 );
	       
	        event = $.event.fix(event || window.event);
	        // Get correct pageX, pageY, clientX and clientY for mozilla
	        $.extend( event, $.data(this, 'mwcursorposdata') || {} );
	        var delta = 0, returnValue = true;
	       
	        if ( event.wheelDelta ) delta = event.wheelDelta/120;
	        if ( event.detail     ) delta = -event.detail/3;
	        if ( $.browser.opera  ) delta = -event.wheelDelta;
	       
	        event.data  = event.data || {};
	        event.type  = "mousewheel";
	       
	        // Add delta to the front of the arguments
        args.unshift(delta);
	        // Add event to the front of the arguments
	        args.unshift(event);
	
	        return $.event.handle.apply(this, args);
    }
	};
	
	$.fn.extend({
	    mousewheel: function(fn) {
	        return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
	    },
   
	    unmousewheel: function(fn) {
	        return this.unbind("mousewheel", fn);
	    }
	});

	})(jQuery);