Another cool thing you can do with HTML is use the ALT tag within your IMG tag. This causes the copyright notice to appear for a couple of seconds when the viewer's cursor hovers over an image. For example:

img src="images/vue_render.jpg" alt="&169; 2003 xoconostle"

(I had to remove the required < carats > so that the code would appear here.)

The viewer will see "(c) 2003 xoconostle" when they "mouseover," except it will be the real copyright symbol, not the parentheical simulation I used.

I like this method because it's discreet, but of course there's nothing wrong with putting an overt copyright disclaimer somewhere on your site as well.