You didn't mention what ports your TV and laptop have, so I am kind of swinging wide here:
First thing to do is find out more about your laptop. Does it have the "skullhead" s-video out? It looks like a regular s-video port with extra pins. If so, most will allow a straight s-video out from that to the TV.
If your laptop has an HDMI out, and your TV is hooked up to a surround receiver that has HMDI in, then you can run out from the laptop to the surround setup, and the video will feed to the TV through that.
There are a whole bunch of really cheap cables, one of which was already suggested (incorrect for your use) and many of them LOOK like just what you would need: a DB-15 VGA connector on one end and composite video, component video and/or s-video on the other.
These are ONLY for use with video cards that support this function. Using them without the correct video out will be VERY expensive for you. :-(
Ok, so, now I am going to go with ideas that follow the notion that your laptop has only a VGA out.
There are MANY different makes of "VGA to TV" conversion boxes. They range in price from about $24 to over $100.
You should be able to pick one up within your price range on any of your favorite electronic sellers. Heck, even Wal-Mart sells these things if you can believe that.
You might also look them up with the keywords: "PC to TV"
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