Leadtek nforce2 deluxe limited

[thurstan]

I have bought one of these motherboards s/h (Ebay grr!) and found that the cmos battery holder is broken off. I want to solder in a new holder but am not certain of the polarity. There appears to be 1 contact near the edge of the board, and two towards the middle. The two away from the edge are connected by a piece of metal - the only part of the old holder remaining.

Does the motherboard takes the usual cr2032 battery?

Also, can anyone tell me which way round it goes?
Is the +ve facing the edge of the board or the centre. I presume if I get it wrong the board will be garbage.

Thanks David