ActionScript 2.0 :: Flash - How To Tell What Frame You Are On In MovieClip

How do I tell what frame I'm on in a movie clip? For instance I want have a preloader set up so that the animation of the preloader plays all the way without jumping around. according to the bytes loaded. Here's the basic gist of what I want to happen:

bytes_loaded = math.round(this.getBytesLoaded());
bytes_total = math.round(this.getBytesTotal());
getPercent = bytes_loaded/bytes_total;
if (loader_mc.currentFrame < getPercent*100){
loader_mc.play();
}else{
loader_mc.stop();
}