for(var i:uint = 0; i < smax; i++) {
  vx = avx[i]; vy = avy[i];
  var dx:Number = Math.random() * 2 - 1;
  var dy:Number = Math.random() * 2 - 1 ;
  vx += dx; vy += dy + gravity;
  var s:Number = w/800;
  
  var left:Number = 0;
  var right:Number = myVid.width;
  var top:Number = 0;
  var bottom:Number = myVid.height;