[F8] Dynamically growing/shrinking grid

I'd like to have a 3X3 grid that when a user clicks on a particular square on the grid, that square enlarges while the others shrink. Here's a brief illustration:

http://img183.imageshack.us/img183/8071/grid01ke9.gif

then clicked:

http://img85.imageshack.us/img85/632/grid02zy2.gif

I've seen this effect before, but I can't recall where. Is there a sample somewhere I could take a peek at?

There's some really old examples here and using their code without understanding how it works is kinda cheating yourself.
http://laco.wz.cz/tween/?page=examples

Sorry, I didn't want to give the impression that I wanted code to steal. I am genuinely interested in learning how it's accomplished.

Thanks for the link.

I know, it was just advice to try and figure out whats actually going on instead of just re-using the code and never really learning.