<!--マウスホイール用 -->
function SWFMacMouseWheel( swfObject ){
	this.so = 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){
		document[this.so.getAttribute('id')].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)
			   SWFMacMouseWheel.instance.handle(delta);
		if (event.preventDefault) event.preventDefault();
		event.returnValue = false;
	}
};