Mountain lion and old apple bluetooth mouse sync problems

I just purchased the a MacBook Pro with Mountain Lion installed. I am trying to pair it with my old bluetooth mouse modle number A1197 with the small scroll ball at the top. I cannot get my computer to recognize this mouse at all. Is there any solution or do I just have to buy a new mouse? The mouse still works fine and has not difficulty synchronizing with my desktop --but Mountain Lion is not yet installed on the Desktop.