getBytesLoaded returns no value!

The fallowing preload does not work and I don’t know why

on frame 1 : button gotoplay(2)

on frame 2 : movieclip loadBar and a textfield called loadText and with the fallowing AS :

loadMovieNum(“1.JPG”, 1);
bytes_loaded = Math.round(_level1.getBytesLoaded());
bytes_total = Math.round(_level1.getBytesTotal());
getPercent = bytes_loaded/bytes_total;
this.loadBar._width = getPercent100;
this.loadText = Math.round(getPercent
100)+"%";
if (bytes_loaded == bytes_total) {
_level1._x = 400;
_level1._y = 150;
this.gotoAndstop(4);
}

///////////////////////////////////////
on frame 3 : gotoplay(3)
on frame 4 : statique text “Image loaded” with stop

problem : there is no bytes counting . loadText and loadBar do not work.

I think that (_level1.getBytesLoaded() ) is no the command tu use to refer to the image 1.JPEG loaded with loadMovieNum(“1.JPG”, 1);:h: