I just took a look at your forum and I have another tip that you might want to use.
Where you have a Private Reply link, adding the following will only display that link whan someone is logged in:
<a href="gforum.cgi?do=message;user=<%user_id%>">Private Reply</a>
<%endif%>
Where you have a Private Reply link, adding the following will only display that link whan someone is logged in:
Code:
<%if current_user_id and not preview and not deleteview and not printing%> <a href="gforum.cgi?do=message;user=<%user_id%>">Private Reply</a>
<%endif%>