function getMyURL(url:String, window:String ):void {
	var req:URLRequest=url is String?new URLRequest(url):url;
	if (! ExternalInterface.available) {
		navigateToURL(req, window);
	} else {
		var strUserAgent:String=String(ExternalInterface.call("function() {return navigator.userAgent;}")).toLowerCase();
		if (strUserAgent.indexOf("firefox") != -1 || (strUserAgent.indexOf("msie") != -1 && uint(strUserAgent.substr(strUserAgent.indexOf("msie") + 5, 3)) >= 7)) {
			ExternalInterface.call("window.open", req.url, window);
		} else {
			navigateToURL(req, window);
		}
	}
}
 
// call the getMyURL using a button mouse event
btn_mc.addEventListener(MouseEvent.MOUSE_UP,navClicked);
function navClicked(e:MouseEvent):void {
	trace("clicked");
	getMyURL("http://newsourcemedia.com", "_self");
}