Right-click "save-as" protection is utterly useless. You are only stopping know-nothing people, and at the cost of annoying all the others. What you need is some watermarking software. I spent the best part of a day a while back looking at as many different watermarking programs as I could find, and would up going with AiS Watermark Pictures Protector - you can find it at
http://www.watermarker.com/watermark-protector
It's not perfect but it's pretty good, quite cheap, and perfectly practical. My complaints about it are minor ones and it works well. You can see examples of watermarked pictures at my site:
http://tannin.net.au but bear it in mind that there are lots of different ways you can do a watermark, so you needn't be limited to the way I've done it.
Yes, you can add watermarks with Photoshop or a zillion other full-on graphics editing programs, but it takes
forever - WPP is quick and easy.
PS: Nice overall site design, clean and elegant, but it triggers my pet hate: pictures that open in pop-up windows instead of in the page itself, so I didn't explore as far as I might have done.