Preloader and Transition for Dynamic Files

I used the “preload with transition” tutorial(http://www.kirupa.com/developer/mx/preloader_transition.htm) bu it doesn’t work if the movie in an another level. my movie loads in a clip called “popup”.

//////////OLD CODE://///////////
b1.onRelease = function() {
if (_root.section != “bijouterie/gal01/01.jpg”) {
_root.section = “bijouterie/gal01/01.jpg”;
_root.transition.gotoAndPlay(“closing”);
}
};

///////////NEW CODE://////////////////
b1.onRelease = function() {
if (_root.popup.section != “bijouterie/gal01/01.jpg”) {
_root.popup.section = “bijouterie/gal01/01.jpg”;
_root.popup.transition.gotoAndPlay(“closing”);
}
};

but the problem is in the next code (placed into the “content” clip, it loads the JGPs files):

onClipEvent (enterFrame) {
if (!loaded && this._url != _root._url) {
if (this.getBytesLoaded() == this.getBytesTotal()) {
loaded = true;
_root.transition.gotoAndPlay(“opening”);
}
}
}

helme!

anybody could help me? thanks