On one of evolt's pages http://dir.evolt.org/tutorials/articles/ there is a link to http://www.beachnet.com/~hstiles/cardtype.html which shows how to do preliminary validation of the input in a credit card number field. My question is... does anyone know if this has changed OR does any one know of more recent documentation on the subject. -kristy Kristy Frey Lead Programmer/Analyst University at Buffalo http://www.buffalo.edu http://members.evolt.org/kristyfrey http://www.kdnow.com