Agh, Perl (cgi) is a nightmare. The dreaded "internal server error" which doesn't really give ANYTHING away as to what the problem might be!
Have you thought about using a PHP script? There are some great (easy to install) guestbooks at
www.hotscripts.comAn important thing to remember when installing a guestbook based on a text file instead of a database is that you have to make the text file writeable. This can be done through your FTP client or the Cpanel file browser.
Well I'm new to PHP, CGI, etc. (as you can probably tell!), but willing to learn, although it doesn't look hopeful so far...
In actual fact, I'm thinking of installing the 'advanced guestbook' on cPanel, I've used it before with few problems. Is this a good move?