Are you just using integers with values from 0 to 99? Or Are you going to have values like '01', '12', '123', '57246' ? because you might want to add more zeroes.
Depending on your answer, the solution could be different.
Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?
How to post data/code on a forum to get the best help: Option 1 / Option 2