The link was to a Video Adapter at the Apple Store, which expired...go figure.
Go to Apple.com-->Store--->Cables & Hubs...
Scroll almost to the bottom.
Text portion of link reproduced here:
The Apple Video Adapter for iBook, PowerBook G4 (12"), or 17-inch iMac (1GHz) was specially designed to allow users to connect to S-video or composite video devices. The video adapter cable plugs into the Video Output port (mini-VGA) built into the back of the computers listed. The Video Output port supports VGA, S-Video, and Composite video out. Use the Apple Video Adapter cable for S-Video or Composite video output only (connect to your TV, VCR, or overhead projector's S-Video or RCA (composite) cable). Use a separate VGA Adapter for VGA video out.
Important:
Requires iBook without an external reset button,12-inch PowerBook G4, or17-inch iMac (1GHz) with mini-VGA port.
Cost is $19.00