Its easy enough to disable the right click button however this is no going to protect images. Without going on and on covering a topic which has been covered to death on this, and most other forums, its just not possible to protect you images the way you are thinking and most other ways.
IMO there is always a way to grab a web site images........including the very last resort, a screen shot.
Wind is your friend
Matt
www.elitemarquees.com.au