apparently, you are concerned that no one can execute a successful right-click? Should/Can we really do that? Thereover there is a wonderful philosophical discussion, please have a look htere: http://webhome.idirect.com/~bowers/copy/copy1.htm
And by the way there is the misconception that we can protect graphics, texts aso. With little effort interested people can get to their destination!
To discourage theft, use watermarks, lower quality images and/or digital watermarking like http://www.digimarc.com/digimarc-for-images