guest book - please help

my website continues to receive porno links on the guest log...I disable both links but these people are still able to post. Is there a way I can stop them from this, I changed the guestbook entry values and they are still able to override it. I use frontpage 2000 - I dont want to lose the information in my guest log if I can help it...

Please can some one help me make this stop???
thank you in advance

 

Your guestbook is wide open and there you would have to
1. Write or find a script that dissallowed HTML posting and removed links.
2. Write or find a guestbook that does account based posting

Option 1 would be problematic:
A. it would not allow anyone to post links
B. Opening it in front page could totally bork the code.