/**
 * @license 
 * jQuery Tools 1.2.3 Mousewheel
 * 
 * NO COPYRIGHTS OR LICENSES. DO WHAT YOU LIKE.
 * 
 * http://flowplayer.org/tools/toolbox/mousewheel.html
 * 
 * based on jquery.event.wheel.js ~ rev 1 ~ 
 * Copyright (c) 2008, Three Dub Media
 * http://threedubmedia.com 
 *
 * Since: Mar 2010
 * Date:    Mon Jun 7 13:43:53 2010 +0000 
 */
(function($) { 
	
	$.fn.mousewheel = function( fn ){
		return this[ fn ? "bind" : "trigger" ]( "wheel", fn );
	};

	// special event config
	$.event.special.wheel = {
		setup: function() {
			$.event.add( this, wheelEvents, wheelHandler, {} );
		},
		teardown: function(){
			$.event.remove( this, wheelEvents, wheelHandler );
		}
	};

	// events to bind ( browser sniffed... )
	var wheelEvents = !$.browser.mozilla ? "mousewheel" : // IE, opera, safari
		"DOMMouseScroll"+( $.browser.version<"1.9" ? " mousemove" : "" ); // firefox

	// shared event handler
	function wheelHandler( event ) {
		
		switch ( event.type ) {
			
			// FF2 has incorrect event positions
			case "mousemove": 
				return $.extend( event.data, { // store the correct properties
					clientX: event.clientX, clientY: event.clientY,
					pageX: event.pageX, pageY: event.pageY
				});
				
			// firefox	
			case "DOMMouseScroll": 
				$.extend( event, event.data ); // fix event properties in FF2
				event.delta = -event.detail / 3; // normalize delta
				break;
				
			// IE, opera, safari	
			case "mousewheel":				
				event.delta = event.wheelDelta / 120;
				break;
		}
		
		event.type = "wheel"; // hijack the event	
		return $.event.handle.call( this, event, event.delta );
	}
	
})(jQuery);