So I've had my '97 Camry XLE for over a decade now (original owner

), and I just recently dug out my remote alarm from a box of junk in my closet. Seeing as how I still drive it and all, I tried replacing the batteries in the remote, only to find that the lock/unlock buttons do not work, while the red panic button functions flawlessly. Since I have not seen this remote in quite a while (at least 5+ years), I was wondering, could the buttons/remote be broken? Or am I just dealing with a case of having to reprogram the remote to work with my camry?
The remote I own is the 3 button remote with all three buttons on one side, with the lock/unlock keys above the red panic button.