as kendra said the images are in their cache anyhow - so right click doesn't do any good. Although for fun I used to use one that was very annoying - if you right clicked on the page the entire page disappeared lol Took them a bit by surprise EG This is always so annoying. On my site I offer a free print to those who notify me of unlicensed use of my images. I think it helps and the response is wonderful, it also dissipates the whole "artists are just greedy money hungry control freaks" concept soemwhat.

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo