Yeah, I've done things like that. Think of each episode button (1, 2, 3, etc.) as a separate self contained movie. When you rollover the static button, it loads that movie symbol which animates the graph to resize. It's just simple movies in simple movies -- you just write actionscript to control it's animation.
You can even do it dynamically as a database so that each bar value will jump to your specified value that your have as a basic text file or what have you
Flash is fun, too bad it's inaccessible.