amount = 100;
mWidth = Stage.width;
mHeight = Stage.height;
for (var i = 0; i<amount; i++) {
thisFlake = this.attachMovie("flake", "flake"+i, i);
with (thisFlake) {
_x = Math.random()*mWidth;
_y = Math.random()*mHeight;
_xscale = _yscale=_alpha=40+Math.random()*60;
}
thisFlake.yspeed = Math.random()*2+ .1;
thisFlake.increment = -0.025+Math.random()*0.05;
thisFlake.onEnterFrame = function() {
this.radians += this.increment;
this._y += this.yspeed;
this._x += Math.sin(this.radians);
if (this._y>=mHeight) {
this._y = -10;
this._x = -10+Math.random()*mWidth;
}
      if (this._x>=mWidth || this._x<=0) {
this._y = -10;
this._x = -10+Math.random()*mWidth;
}
}
}

amount = 100;