Not sure about the audio cable you need -- when I got my Plasma last summer, I paid for them to set it all up.
Do you have an audio cable with red and white on one end, and red and white on the other end? i.e. something like:
http://www.tigerdirect.com/applicati...5355&CatId=449
Perhaps from that picture, one of them goes in the hole next to Input 1, and the other next to Input 2? I can't see how else they'd be doing stereo input, hmmmm. Although, maybe it's another type of cable.
http://www.tigerdirect.com/applications/category/category_slc.asp?CatId=449&Nav=|c:79|&Sort=3&Recs= 10
shows other audio cables, and "RCA Audio" cables seem to be the dominant type, with 2 connectors at each end.