Preloading Dinamic Files, Help!

Hi everyone, i been using the Preloader for Dynamic Files tutorial. http://www.kirupa.com/developer/mx/preloader_transition.htm
It works fine, but i was wondering if it’s possible to add on it some AS that allows it to display the percent of data loaded. So the visitor can see the amount of data loaded while loading the movie. The action script that it use to preload the external movies is:

 onClipEvent (enterFrame) { 
 if (!loaded && this._url != _root._url) { 
 if (this.getBytesLoaded() == this.getBytesTotal()) { 
 loaded = true; 
 _root.transition.gotoAndPlay("opening"); 
 } 
 } 
 } 
  
 After the external movie is loaded it'll play a MC that contains the transitions ("opening") before the movie appears. 

Some help please?

Thanks.