stop porn posts in guestbook?

I have a church website that I maintain and have implemented Matts Script guestbook on it.
I am having problems with someone in Germany posting html links to porn sites. Not really cool if you ask me!
Is there a way to change the script to not allow, or filter html?
Also, is the cpanel guestbook better and does it have filters?
Thanx

 

 

 

 

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