Question: I need a working script for prohibiting users from saving images on their machine. (Is it only possible through disabling right-click?)
Yes, I know that it is impossible, and yes I know that it is a bad practice.
Yes, I also know that I am an idiot. But I need this solution for some specific purposes.

Thanks!

Answer: 
the only real way to do it is probably to encrypt the images in a flash file or something, but no matter how much time you spend jumping through hoops the user can still just press printscreen. there is no reason to even try doing this.
One non-js way to make it harder for people is to absolutely position and size a clear png/gif on top of anything you want to make hard to download with a right click. When they try to save the image, they'll just get the clear one.

EDIT

I just saw this question which is related

[How does Flickr prevent people from downloading images from the site?](https://stackoverflow.com/questions/2129404/how-does-flickr-prevent-people-from-downloading-images-from-the-site)