Q: Help: pb g4 15": change normal keyboard with backlit one

Hi,
I've got a pb g4 15" 1.33ghz with a normal keyboard (no backlit). I'd like to replace it with a backlit one. Do you know if it is possible? Ok, I don't care about the ALS; it is enough to drive backlit with f8 f10 keys. I understand the my pb has no ALS sensor.
Thanks for the help