ok, depending on the inputs into your tv you have several options.
1)If your tv has a VGA input, you can buy a mini-DVI to VGA adapter, this plugs into the side of your macbook, then you run a VGA cable from this adapter, and into your tv.
2)If no VGA, then it will have a composite input (red, white, yellow). You can therefore buy a mini-DVI to video adapter, plug this into you macbook, then using a composite video cable (yellow ends) plug the adapter into the yellow socket of your tv.
If you want sound you need a 3.5mm Stereo Jack (i think its called) to composite adapter, to go out of your headphone socket and into the red and white sockets on your tv.
make sure when purchasing your adapter you get the MINI-DVI to whatever, as many people have made the mistake of getting the DVI to whatever instead, and finding it doesnt fit into the socket on their macbook.
Hope this helps.