Help with Movie Clip Rollover

Im trying to add a advertisement to a site where a user can see the top of the tab-Ad sticking out from behind the menu and if they rollover it the Ad will move up to reveal itself. When the user takes his mouse off the Ad, it will return to its place and just show the top of it again.

Can someone please explain the process… I gotta PNG of the image in flash, and It’s been so long since i’ve used flash I’m just blank :frowning:

Thanks!
-Steve