private function onEnterFrame(event:Event):void
    {
     var dx:Number = mouseX - arrow.x;
     var dy:Number = mouseY - arrow.y;
     var angle:Number = Math.atan2(dy, dx);
     arrow.rotation = angle * 180 / Math.PI;
     var ax:Number = Math.cos(angle) * force;
     var ay:Number = Math.sin(angle) * force;
     vx += ax;
     vy += ay;
     arrow.x += vx;
     arrow.y += vy;
    }
   }
  }