you’ll need two outputs on your laptop that are typically found on most: the first is a small round yellow socket usually found on the back of your laptop, which is the S-video socket. The other socket you need is either a line out (unlikely) or headphones socket (more likely). You also need a TV with the correct inputs, which will ultimately decide which cables you need. The solution you decide on will be determined by your budget, and the prices and codes below are taken from
here, so shop around and you may get a better bargain locally or online.
First, you need two separate cables for video and audio: S-video to S-video (£3.60, 35551), and Stereo 3.5mm plug to 2x RCA plugs (£2.80, 35491). Both cables are two metres long and longer cables are also available from the same site. Your TV will require either equivalent S-video and RCA audio inputs or a SCART socket - if it only has the latter, you’ll also need a SCART adapter (£3.25, 35570).
Once done, plug them all in and switch your TV on, switching to the A/V channel. If nothing appears, open the Display Properties Control Panel, switch to the Settings tab and click Advanced. Look for a Display tab or something similar where you’re able to switch on the S-video port to enable the laptop’s display to route through the TV. Finally, when watching DVD movies (you’ll need a DVD player to do so), look for the option to run them full screen, so you get the best possible picture from your TV.