This one seems to work...

Code:
//====== Inital Level Loader ===============
levelLoader = function (file, level) {
	lev = "_level"+level;
	loader_holder._x = 600.0;
	loadMovieNum(file, level);
	trace("LEV   :"+lev);
	progressCheck.onEnterFrame = function() {
		var percent = (this["_level"+level].getBytesLoaded()/this["_level"+level].getBytesTotal())*100;
		//trace (percent);
		//trace((this["_level"+level].getBytesLoaded()/this["_level"+level].getBytesTotal())*100);
		if (!isNan(percent)) {
			_root.loader_holder.bar._xscale = percent;
		} else {
		//trace(lev);
			trace("0% loaded");
		}
		if (percent == 100) {
			delete progressCheck.onEnterFrame;
			loader_holder._x = 846.0;
			trace("LEVEL: "+level+"      "+"IS FULLY LOADED");
		}
	};
};
levelLoader("ringB.swf", 9); // tried it with one of my files...