Argh Fucking Theives

[T Pat]

I own a rinky dink paysite (Tiajuana Whores) last wednesday I went to the cat house where I get most of the my models from and walked into a hornets nest the girls were pissed, some one had printed out a bunch of photos I had taken and was showing them to the girls (they don't like the girls they work with seeing them naked).
While going through my server logs this morning I noticed I was getting alot of hits from a site I didn't recognise (www.tjamigos.com) it's a forum on Tijuana Hookers after spending a couple hours going through the forum I finnale found where the hits were comeing from, they put up a link to a folder I have outside of my members area that I use for free sites. I thought I was being clever by haveing an images folder that I use for free sites.
my questions are is there a search engine friendly script I can use to prevent pictures being printed?
Is there an easy way to stop people from hotlinking to this folder and still allow the photos on free sites I build?