SPDIF Connector for DVI to HDMI Audio

I have a Packard Bell X2416 with a Denver 11 motherboard and an Nvidia 9600GT graphics card. I have linked the card up to a HDTV via a DVI to HDMI connector and am trying to get an internal SPDIF connector to do the audio passthrough.

The problem is that all the connectors available are 2 pin to 2 pin, whereas the SPDIF Out on my mobo is 4 pin. I understand that of the 4 pins, I only need to connect up the SPDIF signal and Ground pins. However, I have no way of knowing which of te 4 pins these are and suspect it could cause problems to start trying different permutations.

Does anyone have any idea what the layout is on a Denver 11 SPDIF Out connector. Or alternatively, whether there is a standard layout? There does not seem to be a manual I can download.

Regards