Possible Pathing Problem?

So, I’m working on a flash project and I’m just not getting something.
Its eluding me…

I’ve got a main swf, which I’m loading external swfs into…I used this tutorial to accomplish it…
http://www.kirupa.com/developer/mx2004/transitions.htm

I’m trying to load another external swf, into one that is already loaded into the main swf, and it just doesn’t want to work.

From everything I’ve researched online, it appears to be a pathing problem. I am using _root, and that might be the issue, but I really haven’t found a good write up that helps me wrap my brain around the solution. Any suggestions?

thanks