I'm having a problem getting PayPal to work smoothly. When customers checkout, they're sent to the PayPal site (as expected), but they're greeted there with a warning: "Some required information is missing or incomplete. Please correct your entries and try again." I've noticed that six hidden parameters are blank in the last form that submits to PayPal: night_phone_a, night_phone_b, night_phone_c, day_phone_a, day_phone_b, and day_phone_c. I can't figure out where to specifiy these values (or if this is even the root cause of the error message). Any help would be greatly appreciated!

Here's the site: www.wholesaleknob.com