Hooking up the digital optical out to my stereo reciever

I just got a new Core 2 Duo Mac Mini and I want to hook the digital optical out to my stereo. However, I noticed the connector does not seem to be a standard stereo optical cable. What do I need to do to connect this to my stereo reciever which supports digital optical in?

Actually some toslink cables that yoiu buy, come with them. I remember buying a 6' Philips that included the adapters.
Oddly enough, I think I found it at Wal*Mart (maybe target).

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