It is possible to put software on your server that prevents images and other files from being used by external items like this. I don't know what and where however. I'd suggest getting yourself on some kind of server admin mailing list or searching through the deja.com archives. I always though the images were stored on people's geocities accounts... Anyway, there is a way to prevent it. But it's been a while since I've worked in that field so I don't recall how it was done.

Truth has no value without backing by unfounded belief.
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