It's not worth putting that kind of Javascript in. The only thing it does is annoy the heck out of your users. Their are other things in the right click menu besides save as and many users use those functions.
The only true way to prevent someone from stealing your pictures is to not have pictures on your site. For example if I wanted a picture I could just take a screenshot of it and with a bit of work in Photoshop I could have a copy of that picture.
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