Sorry...
Like so many guestbooks, mine has been plagued with lowlife pondscum littering it with links to dubious online pharmacies and other such crap. Then some scumbag spammer (an even lower form of life) used it to send out a load of spam, so my hosting company (quite rightly) disabled the guestbook script (they were very polite about it). I haven't turned it back on yet, but I am going to (there is no way I am going to allow a bunch of good-for-nothing assholes who can't find anything more productive or useful to do with their lives to get the better of me over anything). For the moment, however, the guestbook is closed to new guests, and the world is a poorer place without it ;-).