Unable to get a form to update

Hi all, I've written a really simple contact management system that seems to work perfectly except for updating. Any changes to the contact record can't be fed back to the database. I'd be very grateful if someone would take a look at a text version of the system and suggest where I am going wrong. Thanks in advance. http://captain.kirks.net/rhino/contacts.txt -- Patrick GSM: 07876 560 646 Diplomacy is the art of saying "Nice doggie" until you find a rock