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Very sneaky. they use css to set an image as the background for a table cell and call it without an image extension.
I usually advise people not to bother with trying to stop downloading images, just water mark anything you dont want stolen. Its funny, with firefox you cant disable right clicking if people dont want you to. You can with ie, but with ie, if you hover over the image it puts up a little toolbar to let you download it.
thats about as good a job as i have seen though.