Quite a rubbish script

[tongxn]

I copied this script from a book of mine, it's supposed to make bubbles float upwards, but its manufunctioning again! (total count: 5)

script as follows, I call the bubble snow and i added a invisible mc called control

//well this is the actionscript on "snow"
onClipEvent (load) {
	speed = random(5) + 2;
	tint = random(10) - 5;
}
onClipEvent (enterFrame) {
	this._y = this._y - random(2) - speed;
	this._x = this._x + tint;
	if (this._y > -10) {
		this.removeMovieClip();
	}
}

//and this is the actionscript on "control"
onClipEvent (load) {
	i = 0
	num = 5;
}
onClipEvent (enterFrame) {
	for (p=0; p<num; p=p+1) {
		_root.frame.swapDepths(i+num+1) ;
		_root.snow.duplicateMovieClip("snow" + i, i);
		_root.["snow" + i]._y = 930;
		_root.["snow" + i]._x = random(920);
		_root.["snow" + i]._xscale = speed*3;
		_root.["snow" + i]._yscale = _root.["snow" + i]._xscale;
		i = i+1;
	}
}

so what in heaven's name is wrong?

[tongxn]

not meaning to pester but...