/**
 * SWFMacMouseWheel v1.0: Mac Mouse Wheel functionality in flash - http://blog.pixelbreaker.com/
 *
 * SWFMacMouseWheel is (c) 2006 Gabriel Bucknall and is released under the MIT License:
 * http://www.opensource.org/licenses/mit-license.php
 *
 * Dependencies: 
 * SWFObject v2.0 - (c) 2006 Geoff Stearns.
 * http://blog.deconcept.com/swfobject/
 */
function SWFMacMouseWheel( swfObject )
{
	this.swf = swfObject;
	var isMac = navigator.appVersion.toLowerCase().indexOf( "mac" ) != -1;
	if( isMac ) this.init();
}

SWFMacMouseWheel.prototype =
{
	init: function()
	{
		SWFMacMouseWheel.instance = this;
		if (window.addEventListener)
		{
			window.addEventListener('DOMMouseScroll', SWFMacMouseWheel.instance.wheel, false);
		}
		window.onmousewheel = document.onmousewheel = SWFMacMouseWheel.instance.wheel;
	},
	
	handle: function( delta )
	{
		this.swf.externalMouseEvent( delta );
	},
	
	wheel: function(event)
	{
		var delta = 0;
		if (event.wheelDelta)
		{ /* IE/Opera. */
			delta = event.wheelDelta/120;
			if (window.opera) delta = -delta;
		} else if (event.detail)
		{ /** Mozilla case. */
			delta = -event.detail/3;
		}
		
		if( /AppleWebKit/.test(navigator.userAgent) )
		{
			delta /= 3;
		}
		
		/** If delta is nonzero, handle it.
		 * Basically, delta is now positive if wheel was scrolled up,
		 * and negative, if wheel was scrolled down.
		 */
		if (delta)
			SWFMacMouseWheel.instance.handle(delta);
		/** Prevent default actions caused by mouse wheel.
		 * That might be ugly, but we handle scrolls somehow
		 * anyway, so don't bother here..
		 */
		if (event.preventDefault) event.preventDefault();
		event.returnValue = false;
	}
};