I've just written 2 functions to work with Luhn numbers. Luhn numbers are (usually) many digits long, and have a built-in checksum. This checksum allows the number to be checked against someone accidently entering it in wrong. Luhn numbers are good for account numbers (in fact the 16-digit credit card numbers issued by MasterCard and Visa are Luhn numbers) Here's the functions: ;=============================================================================== ; ; Description: Returns weathe