Whats up with the alternator belts in the engine picture

http://cgi.ebay.com/ebaymotors/Camaro-Z-28-1969_W0QQcmdZViewItemQQ_trkparmsZ66Q3a3Q7c65Q3a10Q 7c39Q3a1Q7c240Q3a1308Q7c301Q3a1Q7c293Q3a1Q7c294Q3a 100QQ_trksidZp3286Q2ec0Q2em14QQhashZitem4a98024a24 QQitemZ320377866788QQptZLHQ5fDefaultDomainQ5f210

there's only one belt. you see the reflection off the front chromed alternator fan assy.