make a simbol and edit it now make an animation make an animation either, it lasts 100 frames
now put this code:

onClipEvent (load) {
total = _root.getBytesTotal();
}

onClipEvent (enterFrame) {

loaded = _root.getBytesLoaded();

percent = int(loaded/total*101);

cargado.text = "loading... "+percent+"%";

gotoAndStop(percent);

if (loaded == total) {
_root.gotoAndPlay(2);
}
}

and inside of the simbol put a dynamic text that var name is "cargado"
thanx is all for now