private var _timer:Timer = null;
private function wait(sec:int):void{
  stopWaitTimer();
  _timer = new Timer(sec * 1000);
  _timer.addEventListener(TimerEvent.TIMER, onWaitTimer);
  _timer.start();
}
 
private function stopWaitTimer(){
  if(_timer ! = null){
    _timer.removeEventListener(TimerEvent.TIMER, onWaitTimer);
    _timer.stop();
    _timer.reset();
    _timer = null;
  }
}
 
private function onWaitTimer():void{
  stopWaitTimer();
  /*  */
}