ActionScript 2.0 :: Making A Presentation Of Some Projects?

Basically i am making a presentation of some projects. I have a three button (with movieclips underneath) left handed navigation menu. When I click various buttons, the movieclip underneath it will move right and expand to fill the available content area. Now when I click other buttons, I want the current movieclip that is currently open to reduce in size and return to it's start position, followed but the newly selected movieclip to move right and increase in size.This is what my little brain thinks may work:Somewhere (perhaps on the main stage) you have code like this:

var lastusedmovie = ?? (array, string??)

Then on each of the buttons over the movieclips you have the following code

On(release) {
lastusedmovie.gotoAndPlay(32) // THE FRAME THAT CLOSES THE BOX
then // OR SOMETHING ELSES THAT SAYS DO THIS BIT AFTER THE BOX HAS CLOSED

[code]......