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You can to the old right-click prevention JS script which makes it a little more difficult, but they can still get them by viewing source and grabbing the URL.
Also, be sure to modify your Apache config to disallow Google/Yahoo, etc. from indexing images = they won't show up on Image Search. There was a great thread on GFY here awhile back with example code, but I'm sure a quick search will show up tons of examples.
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