you can get a mini-DVI to video adapter from the apple website, they don't do one directly to scart, but im thinking you could then get a composite video to scart adapter too. This is the blurb from the apple website (i dont know how to link from the apple store, the links never work):
"The Apple Video Adapter for iBook, PowerBook G4 (12”), eMac (with AirPort Extreme), 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."
However, most modern tvs, or dvd players have composite video inputs, so maybe you dont need scart after all?