To use my 42" flat screen TV as a laptop monitor, what should i use?

Hi, basically I have just bought a 42" flat screen LG TV, and I would close to to really use my TV as a monitor for my laptop, I know there are products out there for this merely I could do beside someone's help to point me within the right direction as I am sort of lost :D

I am looking for a product that could allow me to do this wireless and preferably be quite small as my TV is on the divider, compatible with a Advent Roma 2000 laptop. I think that is all the information you need :)