[GreatRash]

Написал так:

_root.onEnterFrame = function() {
	function newRandom(min:Number, max:Number):Number {
		return Math.ceil(min+Math.random()*(max-min));
	}
	randX = newRandom(0, 200)+18;
	randY = 10;
	d = this.getNextHighestDepth();
	var new_mc:MovieClip = attachMovie("movie", "mc"+d, d);
	new_mc.onEnterFrame = function(){
	this._y +=randY;
	this._x = randX;
	}
};

тоже самое...