Preloading movie clips separately

1

i was wondering if this was possible, so that i would just have a movie load with a plain bg color and then have movie clips placed on the stage which start to show based on the percentage that they are loaded. here is the code i was messing with which didn’t seem to do the trick:

// set the alpha of the mc to the amount of it loaded so far
photo_mc.onEnterFrame = function() {
	var loaded:Number = this.getBytesLoaded();
	var total:Number = this.getBytesTotal();
	var showMe:Number = (Math.ceil((loaded / total) * 100));
	this._alpha = showMe;
};

any help is greatly appreciated. thanks in advance.