Need help with BT mouse

I have a BT Mighty Mouse, a MBP and an iMac G5. The BT MM works on the iMac. I don't want it to, but iMac discovers it. I want it to work with the MBP. Both the usb mouse and the MM work on the iMac at the same time.
How can I get the BT MM to work again on my MBP? I've tried most everything I can think of. MBP won't discover the BT MM.

 

Guess I fixed it by deleting it from the iMac. Now MM works on MBP and not on iMac.