Scratch

package 
{
    import flash.display.MovieClip;
    import flash.events.Event;

    public class game extends MovieClip
    {

        public function game()
        {
            import flash.events.Event;
            import flash.display.MovieClip;

            stage.addEventListener(Event.ENTER_FRAME, tick);
            stage.addEventListener(Event.ENTER_FRAME, addShadow);
            //stage.addEventListener(Event.ENTER_FRAME, addNeoshadow);
            var timer:uint = 0;

            function tick(event:Event):void
            {
                timer +=  1 / 24;
            }

            function addShadow(event:Event):void
            {
                if (timer >= 4.8)
                {
                    if (rand(3) == 3)
                    {
                        addChild(enemy);
                    }
                }
            }

            function rand(limit:Number):Number
            {
                var randomNumber:Number = Math.floor(Math.random() * (limit + 1));
                return randomNumber;
            }
        }

    }

}