Originally Posted by Jonathan

One thing to keep in mind - someone will always be able to steal the image, even if it means taking a screenshot and cropping.

One good technique that I've seen is to make the image the background of a table. Then put a transparent gif of exactly the same dimensions in the table.

So to better explain this - your image is 200 x 150. You make a table of exactly that size with 0 cell padding and spacing and 0 border. Then you specify the image you want to protect as the background for that table. Just leaving it like that would mean that people couldn't right click and save (although they can still go into the html source and get it). But to further confuse them, you put a transparent gif in the tablet that is exactly the same dimensions as the table. Then people will right click to save the image, and think they are saving the protected image to their computer - but they are just getting the transparent one.