Lite hjälp med två kodrader i Actionscript 3

stop();
import fl.transitions.Tween;
import fl.transitions.easing.*;
import fl.transitions.TweenEvent;

var alarm1:Timer = new Timer(1000);

alarm1.addEventListener(TimerEvent.TIMER, on_timer_first);
function on_timer_first(MouseEvent):void
{
   trace("alarm1");
   alarm1.stop();
   var add_mc = new add_startsidaContent();
   addChild(add_mc);
   add_mc.y = add_mc.y + 89;
   add_mc.x = add_mc.x + 1;
   motion1 = new Tween(add_mc,"alpha",Strong.easeOut,0,1,0.5,true); 

   motion1.addEventListener(TweenEvent.MOTION_FINISH, onMotionFinished1);
   function onMotionFinished1(event:TweenEvent):void
   {
      removeChild(add_mc);
      this.gotoAndStop(1);
      mc_header.gotoAndStop(187);
   }
}