button within movie clip possible?

totallydavemitchell.com/ww_falsh_site.swf (scrappy mock up)

For the gallery page, im going to have the whole page as a movie clip (named "gallery").
Then I want buttons within the movie clip which effect the movie clip."gallery".

This will then open up a 2nd movie clip ( named "pictures from last night"), and in it i want to have buttons which effect the movie clip "picture from last night".

So there are 2 questions i need really, or hints/codes :)

Im sure must be easy. My mind has gone numb as I have been doing this site from scratch for the last 38 hours almost straight.

Is this possible to do? Or have I just conffused you and myself at the same time. lol