It will look like crap through Svideo. Unlike erickkoch, I would rather have decent resolution than a couple more inches. But for $19 you can get the Svideo adapter for your Mac at the Apple Store. It should be called "Mini-DVI to Video" or something like that. Do a search online or ask at a Store.
Are you sure the TV doesn't have an HDMI or DVI port? Or VGA? Seems really strange that it would not have one of these 3 choices if it is a recent model.