You could try encrypting your code, there are a handful of small applications for this, but at the end of the day a screen grab is only a key-push away.

It's unfortunate, but in reality the bottom line is if you don't want someone grabbing your images, either don't put them on the web or spoil the image with a watermark.

Personally, I just put 'em up, (no bigger than 600x400 with a screen resolution of 72 with my email address/copyright somewhere on the image - definately not of a photographic quality).

At the end of the day, all you can do is make it difficult, or not worthwhile, in any commercial sense - but never impossible.

Adieu,

TFC
Nothing is a problem for me...