I am glad to hear it. I just put it down to a one-off bad experience. Nothings perfect!
I can't remember exactly when it was however I have been able to find a page which seems to list the "accomplishment" of the hacker that did this called 1923Turk.
The address for the
website hosting with details of my guestbook hacking is
http://old.zone-h.org/defacements/mirror/id=5491472/
This page shows the result of the hacking activity on my
website hosting as well as other details.
Overall I rate security very high and I have only had this one bad experience!