Transition between ext SWFs Tutorial help!

Hi!

Got a simple question…

I have followed this great tutorial on transitions between external SWFs

http://www.kirupa.com/developer/mx2004/transitions.htm

You can find the result here:

http://www.augustkiteboarding.com/snokite/snokiteV2/snokiteV2.html

Now, I wonder if/how I can make this work with movieclip buttons instead of button instances?

I have tried but failed. Can anyone enlighten me?

thanks!