Front Panel USB

Hello,
This is problem I face:
I have just bought a new case for my pc. The motherboard is in fine, the new PSU is working a treat and all the CD and hard drives are working perfectly. The only problem I face at the moment is the front panel 2xUSB I have on this case.
My motherboard supports 2xUSB ports on the front, and they definately work because I had them in my previous case.
However, when coming to connect them all again, I am faced with a dilema.
In the motherboard manual (Asus A7V8X - X), it gives me a diagram showing the 10 pins in a 5x2 layout. They are labeled with
USB+5v
USB_P5-
USB_P5+
GND
USB+6V
USB_P6 -
USB_P6+
GND and NC.
The connecters on my case are:
2xPort+
2xPort-
2x-
2x+

Also note that the motherboard has 10 pins, the case only 8.


If anyone can offer me any advice on which goes where it would be most appreciated!

Alan