How to make username (uid) active in guestbook?

Hello,

I want to do this,

If 'A' post something in B's guestbook then A's name must be hyperlink in to B's guestbook. so B can post reply to A in A's guestbook.

Now we can see who wrote this note but his name remains off , I want that name active link to his guestbook.

This is somewhat orkut.com scrapbook like function , but it is very good.

Thanks