うぇぶウェブWEB。 6/30/wed/2010

var speedX:Number = 5;  

ball1.addEventListener(Event.ENTER_FRAME, onEnterframe);  
ball2.addEventListener(Event.ENTER_FRAME, onEnterframe);
ball3.addEventListener(Event.ENTER_FRAME, onEnterframe);
function onEnterframe(e:Event): void {  
   var mc:MovieClip = e.target as MovieClip;  

  if ((mc.x - mc.width/2)> stage.stageWidth){  
    mc.x =- mc.width/2;  
}else {  
mc.x+=speedX;  
}  

}