Animated Mouse Over Buttons

Hi,

I have searched around the internet and i am either getting the same response or a really complex answer… maybe someone can help…

I would like to have animated mouse over buttons, so for example they fade in when i mouse over, not just immediately change, i am aware that loading a movieclip inside “Over” of a button will give me this result, the problem is that when i move the mouse away it snaps back to “up”. Is is possible to fade back to “up” or is it more complex than that?

paul.