Validetta is jQuery plugin which you can do client-side validation of your forms. It aims to decrease your burden with easy usage and flexible structure.
Validetta - Features:
You can check fields whether it is empty or not or it is chosen or not.
You can do e-mail check.
You can do number check.
You can check if the two fields are equal to each other.
You can check credit card number validation.
You can limit number of characters written to fields.
You can limit number of choice of
