var timerat:Timer = new Timer(3000,0); // Interval 3 seconds, loop forever

timerat.addEventListener(TimerEvent.TIMER, fl_timer);

timerat.start();

function fl_timer(event:TimerEvent):void

{

var flipperanim:Tween = new Tween(Object(this).mc,"alpha",Strong.easeOut,0,1,2,true);

}