Help with Actionscript please?

[Grizzam]

Alright so I have been "off" of using flash for a couple years now, and I'm trying to get back into the groove of things. I've already fidgetted enough to remember how to do all the basic animation portions of flash, but I can't for the life of me remember dick about scripting. I want to do a simple action, and here's my description:
There's Image1 and Image2. I want to make it so with just a mouseover (no clicks!) Image1 becomes Image2.

This is probably something simple, and I'll be the first to admit to being a noob. Anyone able to help me out?

[Kirk-Cocaine]

Convert Image1 to a button symbol (highlight it and press F8). Double click it to enter the button's timeline. On the "Over" frame insert Image2, hey presto! No script needed.

Also, please ask any further Flash questions in the Flash Forum. Cheers.