/**
 * 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/
 * modified by vccorp. 2010.3.23
 */
function SWFMacMouseWheel()
{
	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 )
	{
		var swfObj = this.getSwfObject();
		for (var i = 0; swfObj && i < swfObj.length; i++) {
			swfObj[ i ].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;
	},
	getSwfObject: function () {
		if (!this._chkSwf) {
			this._chkSwf = true;
			this.swfObj = [];
			var tags = ['OBJECT', 'EMBED'];
			for (var i = 0; i < tags.length; i++) {
				var elems = document.getElementsByTagName(tags[i]);
				for (var j = 0; j < elems.length; j++) {
					if (typeof elems[j].externalMouseEvent == 'function') {
						var is_child = false;
						for (var k = 0; k < this.swfObj.length; k++) {
							if (this.swfObj[k] == elems[j].parentNode) {
								is_child = true;
							}
						}
						if (!is_child) {
							this.swfObj.push(elems[j]);
						}
					}
				}
			}
			if (this.swfObj.length == 0) {
				this.swfObj = null;
			}
		}
		return this.swfObj;
	}
};