[flashCs2] button within mc to control ext'.swf on root?HELP?

O.k… my flash skills would be described at noob so il try and explain myself clearly…

Im working from 2 tutorials which i would like to combine
firstly: http://www.communitymx.com/content/article.cfm?page=1&cid=FD491
secondly: http://www.kirupa.com/developer/mx2004/transitions.htm

Im trying to build a website using fluid objects and loading external .swf’s to a container…
One of the fluid objects will be a set of 4 buttons which i would like to load these 4 .swf’s to the container…

It all seems to look and work fine except for the fact that the buttons dont load anything into the container… Im sure it has something to do with the fact that the buttons are within a mc… perhaps something to do with _root or _level0? or something…

I have included a zip file if someone could have a look at and let me know whats wrong

Thanks