Wano,
assuming your TV has s-video, then do as ibookin said, but I am pretty sure what you mean is an S-VIDEO-to-RCA converter cable, which I am not sure about. Maybe go to your local electronics store, like a circuit city, and ask them if they have a s-video to rca adaptor/converter thingy. Sorry that I cannot help, since my mac doesnt have svideo 😀