Jose, I don't understand how you're going to match them with city, ZIP, and area code. You mean you want to take their area code and see if their ZIP code falls within it? In order to do this, you would need a table with all of this information in it (pretty big one too) and then you'd have to have some back-end server process to perform this validation for you. You wouldn't be able to do it in FrontPage alone. You'd need a server-side scripting language like ASP or PHP... or at least a real complex Javascript function. This is definitely beyond FrontPage's built-in functionality.