private function starUpdate(e:Event):void
{

    var now:uint = getTimer();
    var delta:uint = now - _last;

    for(var i:int = 0; i <_starfield.length; i++)
    {

        _starfield[i].y += speed * delta;
        //_starfield[i].scaleY = speed * .02;
        if(_starfield[i].y > 800 + _starfield[i].height/2)
    {
    _starfield[i].y = -60;
    _starfield[i].x = _rand.gen(0,480);
}