Mouse Over - Starts Movie?

I’m fairly new to flash but not new to programming.

In a recent post (as well as many others) I’ve seen flash animations that have an effect that I’m trying to accomplish. It seems pretty standard so I’m guessing there has to be a tutorial on the web somewhere for this. My problem is that I dont know how to to Google it properly.

Anyway, here’s the site:

[color=#800080]http://www.proscreate.com/[/color]

I want to know how to activate a movie clip when you place your mouse over a button or something like that. In the link above, a user can mouse over the menu options and a small animation will play.

Do you know of any good tutorials that might cover this? Can anyone point me in the right direction? Does anyone have a sample .fla they can post so I can figure out how to do it?

Thanks a ton.