The only image used as a link on these particular pages is the logo for my site, which takes you to the main page. The script is only implemented on the "smilie" pages, and the users can easily return to the main site by simply clicking the "logo", there would be little point in opening another window to do so.
Since the script isn't implemented on the main site, I don't prevent someone from saving an individual smilie, just make it more difficult to grab an entire set to be reused for their own purposes. With only 200 members, I'm not aware of any of them using Mozilla based browsers, they are mostly IE, with a few Netscape, and 1 or 2 WEBTV mixed in.
While the latest script still seems to have some down sides, I believe it's the best I can do for making a repeat of the wholesale stealing of the copyrighted images impractical. If anyone wants the images badly enough to jump through the necessary hoops to get them, then I'll let the copyright holder pursue it from there.
It's quite a testament to Futurequest's community to be able to ask a question and receive both sides of an issue without anyone getting bent out of shape. I just love this place.
Again, thanks to everyone for the input.