Mouse out animation?

Ok, so what I want is that an animation will be played on mouseout…

I suck at AS, so this is the closest I can get to a solution:

 on(rollOut){
 _root.hover.gotoAndPlay("out");
}

I haven’t done flash in quite a while, so i forgot how to use the _root thingie…
I know you guys at kirupa are wizards so please help me! :puzzled:

PS.
In the button, I have a MC (called hover) that lies on ‘over’, and the AS is on the button.