CardCheck is a credit card Validator and Type Guesser.
It provides instant feedback during credit card number entry.
Validate credit cards, guesses the type, highlight the card-type icon automatically. Fully documented and easy to use! Works with jQuery Versions 1.3 – 1.7.1. Works with all major browsers: Internet Explorer 7/8/9, FireFox, Chrome, Safari, and Opera. Provides multiple callbacks for integration into existing software.