iMac Combo Headphone/Optical Out Port Cable


I just picked up a used Apple G5 iMac (2005 model) that has a combination analog/optical digital audio output port. The output on the iMac is a mini plug. I want to use it to digitally connect to a Panasonic receiver and I can use either an optical Toslink and S/DIF RCAs input. I can't find a cable that does what I want. Anybody know how to connect this setup?
128x128onhwy61
Pretty sure it's one of those Apple-only, proprietary do-hickeys, as only brought to you by the wonderful world of Apple. In short, check the Apple store and expect to pay way too much... Why Apple can't make use of the same connectivity as the rest of the world never ceases to infuriate, but that seems to be the way it goes.
The cables on the Apple Store are all analog cables going from a stereo mini to dual RCAs.
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