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Can you confirm you have the 15 pin connector(female) on your laptop and behind your TV. Also how long of a cable do you need? will 6 ft. work or do you need 10 ft. or longer?
Are you going to want the audio to run through your stereo system or do you just want to hear the audio out of your TV speakers?
One thing to keep in mind is where are you going to set your laptop when hooking it to your TV. Also how far away is your stereo system if you decide to run the audio through that.
monoprice.com has all lengths you just have to confirm ALL THESE QUESTIONS and you will have your computer on the tv in no time. It's easier than you think. It just depends on how crazy you want to get. The closer your laptop is to your equipment the better because then you can hide the cables and leave them hooked up and tucked away when not using you laptop on the TV. The whole shooting match will cost like 20-30 dollars max to achieve what you want to do.
I hook up mine like once a week with the kids and play slide shows and watch new movie trailers and the sound is booming out of my receiver. I can help you out in 1 post for what took me a 1.5 months to figure out on my own. Just need all the info.