Resizing External Movie Clip - Not fullscreen toggle

I created a splash page where you click on one of two buttons. I then whatever button you press, an external swf movie plays.

What I want is for these external swfs to resize as large as it can be in proportion within the browser. When it’s done playing I want it to go back to the standard stage size.

Here what it looks like thus far:
http://colorrot.com/test/index.html

Eventually I’ll setup preloaders and stuff for the videos, but for now I just want to get this working.

What I DON’T want is a true toggle full screen. For some reason I can’t find any good posts on doing this that doesn’t use AS3.

Thanks
:glasses: