Diamond, they've pulled the keys off, but the keyswitch is still there and working ok? I think you'll have to goto HP for spare keys.
Has your lappy got a ps2 socket on the back??? If it has get your self a cheap keyboard & plug it in..xp will detect it and away you go. You could also use a USB keyboard, if you've got a spare usb port, although USB keyboards tend to be little more expensive. But then again the spare keys may only be a couple of quid, or they might be 20quid!!! But you'll have to find out first...
Have fun