Laptop keyboards are slightly different from external keyboards, but the principal is the same. Keys are held on by some kind of minor clip mechanism and should be able to come right off.
The trick is getting them to come up, and not sideways. With sideways, you can lose a key (by breaking some of the tiny plastic tab). You should be able to get a key puller for just a couple of bucks at a local computer store... cheap insurance.
However, if the contacts have gone bad, the keyboard itself will need to be replaced. And that's when your warranty is your friend...
