Your link is broken, do you mean:
http://www.dynamicdrive.com/dynamici...box2/index.htm
?
If so, that script already puts an overlay over the image for navigation, although I don't think it was the intention, this also prevents (for image groups) most right click copying of the image but not PrtSc copying. Nothing you do will prevent the image from being copied by anyone with a little knowledge of browsers though, and a watermark almost always detracts from the appearance of an image. So if you really want to frustrate copying, the watermark would have to be part of the image itself. You shouldn't put any image on the web that you intend to sell. You may use a lower res copy as a demo. If it's just your copyright you are concerned with, all items published on the web are copyright. If there is ever any significant harm to you from a violation of that copyright, you can sue.
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