codice:
suono = new Sound();
suono.loadSound("prova.mp3", true);
_root.onEnterFrame = function() {
	tot = suono.getBytesTotal();
	car = suono.getBytesLoaded();
	this.perc = int(car/tot*100)+"%";
	this.istanzaCampoTesto_txt.text = Math.round((this.getBytesTotal()-this.getBytesLoaded())/(this.getBytesTotal()/1000)) 
	if (car == tot && car>1024 && this.getBytesLoaded() == this.getBytesTotal()) {
		trace("ciao");
		//suono.start() 
		gotoAndPlay(2);
		delete this.onEnterFrame;
	}
};