Image fade animation effect

[contemporaneous]

Hello, folks. It's about time I've joined this forum, I don't think I'll ever figure out Flash purely on my own -- especially when it comes to working with scripts.

First, I'll say I looked through several pages in here and didn't see anything quite hitting on what I'm looking for, so here's the problem I'm trying to work through:

Let's say I have a Flash button with an animation that plays when you hover your cursor over the button. That's easy enough to do. But what I want it to do is play the same animation when I move the cursor away, but run it in reverse. I have attached an example file I've been working with so you can maybe see what I'm talking about. Pictures are always helpful.