btn1.addEventListener("mouseDown", buttonF);
 
function buttonF(evt:Event):void {
 
               var url:String = "http://www.flafolder.com/";
            var request:URLRequest = new URLRequest(url);
 
            //var variables:URLVariables = new URLVariables();
            //variables.exampleSessionId = new Date().getTime();
            //variables.exampleUserLabel = "guest";
            //request.data = variables;
 
            navigateToURL(request);
 
}