edt512

in the script below jdf is my button instance name; myFunction is my function name

change the URLRequest parameter to your URL, keep the quotes 

Script  

 jdf.addEventListener(MouseEvent.CLICK, myFunction);

function myFunction(event:MouseEvent):void {

var targetURL:URLRequest=new

URLRequest("http://www.apple.com");

navigateToURL(targetURL);

}