Código ActionScript :
stop();
preload._width = 0;
preload._visible = preload_bg._visible = true;
preload.onEnterFrame = function(){
tamano_total = _root.getBytesTotal();
if( tamano_total == 0 ) tamano_total = 1;
porcentaje = Math.round( _root.getBytesLoaded() / tamano_total * 100 );
txt = porcentaje + " %";
preload._width = porcentaje * 3;
if( porcentaje == 100 ){
txt = "";
preload._visible = preload_bg._visible = false;
_root.play();
delete this.onEnterFrame;
}
}http://www.catedramex.com.ar/2010/07/como-hacer-un-preload-en-flash/
