/**
 * SWFMacMouseWheel v1.1: Prevents JavaScript errors when no callback is added in Flash (Thomas Meyer, Less Rain, http://www.blog.lessrain.com/ )
 * 
 * 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( swfId )
{
	this.swfId = swfId;
	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 )
	{
		if (this.swfElement==null) this.swfElement = document.getElementById( this.swfId );
		if (this.swfElement.externalMouseEvent) this.swfElement.externalMouseEvent( delta );
	},

	wheel: function(event){
        var delta = 0;
        if (event.wheelDelta) { /* IE/Opera. */
			delta = event.wheelDelta/120;
        } 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;
	}
};