Rotate a mc on rollover

Hi!

I want to rotate (animated of course) a movieclip and stop the rotation with an easing out when I rollover a button. On roll out i want the movieclip to return to its previous state.

I have no idea how to do this and would be really grateful if someone could help me.

It should look like something like on this site: http://www.karinpartin.com/

Thanks

Jonas