spam in guestbook

Hello!
The guestbook on a clients website gets inundated with spam (he doesn't want 'image verification' instaled), so every day the spam messages are removed, IP numbers are added to the 'banned' list and certain words are banned. However, recently there has been spam inserted into the 'country of origin' section which is included in this certain guestbook, not the 'message' section. Banned words have been included. Is there any way we can stop this?
Thanks for any help!
Fiona

Hello Fiona,

Open the file "add.php" and find line 138, which should read:

Change that line to the following:

That should do the trick.

That's great Pete. Thanks!