Well, s-video cable shud cost u between Rs. 100-150. It shud be available at any computer hardware store. Usually, it would have one s-video port at one end and 2 RCA ports at the other end. RCA ports are those 3 colored ports that are used to connect dvd players. Please note that only one of those RCA cables carry video signal, so try each one of them and put the other one in any of the sound port(L/R).
These s-video cables are not so reliable and so doesnt work at times. When i tried connecting my lappy to the TV, it was the 3rd cable that actually worked. All this setup is a bit messy but if it works once, u wud be happy. Although dont expect a very gud video output, at times it turns out to be black and white. That could be due to loose connection or faulty cable. The vendors selling these cable know it cud be faulty, so it wont be an issue getting it replaced.
Apart from the s-video cable, you wud need to get another cable for sound. This wud have a standard 3.5mm jack at one end that wud connect into the audio-out port of ur computer and on the other side, it'll have 1 RCA port. Put it into one of the audio ports(L/R) of ur TV. This cable shud cost u arnd Rs.50.
After connecting the cables, restart ur computer and then change the settings on ur computer to send the output to ur TV. The details of these settings would be provided in the manual of ur graphics card.
Before attempting all these, do check if ur tv has a s-video-in port. If so, get a s-video to s-video cable, else s-video to RCA cable. Rest everything remains the same.