_root command problem

Hello everyone
As you can see Im new here. I would like to ask you sth… I got a problem with _root command.
I’ve finished tutorial “Preloader and Transition for Dynamic Files” by claudio
http://www.kirupa.com/developer/mx/preloader_transition.htm
and everything works fine. But when I put everything in another movie clip (to arrange it on the certain point in the browser for example) then it stops working.
I assume thats because of _root command that aplies to main timeline.
I thought that getting rid of _root will do the job but I was mistaken. Can you tell me what should I do ?

I would really apreciate any help