There is no way to stop any image you place on a web page from being stolen by anyone who really wants it because they will already have a copy of the image in their own computer's internet cache once they see it on the page. The most effective way to discourage theft of your images is to place a watermark across them with a copyright message or your domain name. No Right Click Scripts can be easily bypassed by the thieves and just drive people away from your site since the context menu attached to the right mouse button is used for a lot of legitimate purposes.
The Image Protection form takes a different approach. This form generates the HTML to use to insert your image into your page in such a way that right clicking on the image will not allow your image to be saved. A different image (provided with the form) will be saved instead. By the time that the would be thieves realise that they have saved the wrong image they may decide it's not worth the bother to return to your site to get the right one.