Ok, you have to "simulate" animated buttons: put the animations (2 instances of the movie symbol) and the buttons (2 instances of the button symbol) on separate layers. Now you'll trigger the animation to play by "Tell Target", like this:

On (Roll Over)
Begin Tell Target ("/Movie1")
Play
End Tell Target
Begin Tell Target ("/Movie2")
Play
End Tell Target
End On
On (Roll Out)
Begin Tell Target ("/Movie1")
Stop
End Tell Target
Begin Tell Target ("/Movie2")
Stop
End Tell Target
End On

(you should name the both movies "Movie1" & "Movie2" for this to work)

OR, you can do this with a variable:
(first set)

On (Roll Over)
Set Variable: "Over" = "1"
End On
On (Roll Out)
Set Variable: "Over" = "0"
End On

and then in the Frame 1 of the movie clip:

Set Variable: "Temp" = /:Over

and in the Frame 2 of the movie clip:

Stop
If (Temp=1)
Play
Else
Go to and Play (1)
End If

This is just a idea and is still in "raw" format. I can send you a .fla, or refine that source to sumfing good looking, if you post (or mail ne at [email protected]).
Now this won't work if you can't separate the button from the animated part, but... Well, at least i tried