prova con
codice:
stop();
this.onEnterFrame = function() {
	loaded = Math.round(getBytesLoaded()/getBytesTotal()*100);
	percent = loaded+"%";
	_root.barra._xscale = loaded;
	if (loaded >= 30) {
		delete this.onEnterFrame;
		gotoAndPlay("preload", 2);
	}
};
ciao