If it is a newer TV, then you should have an HDMI connection. If your laptop has an HDMI port as well, just buy an HDMI cable and hook it up to the TV. That will use your TV as a monitor for your laptop and i'm sure you can figure it out from there.
That is how me and my friend hook ours up to his flat screen LCD TV and just watch a movie we have on disc or download on iTunes or Windows Media Player or whatever works best for your computer.
Hope that helps. Good luck!