Already I have solved the problem. I still have that the code to purify a bit that it is sure that this slightly dirty, but now it is working perfectly at KM.
The code is now:
Code:
Stage.scaleMode = "noScale";
//recibe bytes devuleve kb
function bytes2kb(val){
	return Math.round(val/1024)
}
//holder para el contenido.
createEmptyMovieClip("holder",1);
//atachamos el preloader.
attachMovie("loader","loader",2,{_x:283,_y:229});
loader.box.autoSize = "right";
loader.barra._xscale = 1;
//objeto mcloader
my_mcl = new MovieClipLoader();
//listener
my_mcl_listener = new Object();
//callback para cuando empieze la carga
my_mcl_listener.onLoadStart = function(t){	
	trace("inicia carga");
	t._visible = false;
}
//callback cada vez que se cargue algo
my_mcl_listener.onLoadProgress = function (t,bl,bt){
	var p = (bl / bt) * 100
	loader.box.text = "cargados: " + bytes2kb(bl) + " de " + bytes2kb(bt) + "KB";
	loader.barra._xscale = p;
}
//callback en caso de error
my_mcl_listener.onLoadError = function (t,ec){
	trace("ups! error " + ec)
	loader.box.text = ec;
}
//callback para cuando se termina la carga.
my_mcl_listener.onLoadComplete = function(t){
	loader._visible = false;
	t._visible = true;
	trace("fin de la carga.");
}
//agregamos el listener al mcloader
my_mcl.addListener(my_mcl_listener);
//cargamos la imagen.
my_mcl.loadClip("index.swf",holder);
stop();
It´s working now yours can see:
HERE
Thanks infinites for your attention and I sorry for the coment in this code, it is spanish, that is my language.