Little help with rollovers please

Ok, im trying to make a menu, and it has to have rollovers. This is the easy part, and i can do the animation good. But, when the mouse go’s off the button, it has to do a return effect, like this:
What would be my best method of setting it up, to where when i mouse over, it plays, then stops, and when i mouse off, it plays the rest. Should i use a button or MC for this? Any code necessary?
Thanks guys,