Flash中如何为按钮添加链接

on (press, release) {
  getURL("http://www.zzzyk.com", "_blank");
}

var ur:URLRequest = new URLRequest("http://www.zzzyk.com/");??
function openURL(e:MouseEvent):
void{????
navigateToURL(ur,"_blank");??
}??
btn1.addEventListener(MouseEvent.CLICK,openURL);