there are two answers to this:

1) it cannot be done.  as long as that image is on the person's
computer screen, it is physically impossible to prevent that
person from saving the image and using it.
(a simple tap of the "print screen" will take a screenshot
on windows machines, as someone else mentioned)

2) if you used java or some form of server-side script to pass
the binary data directly to the browser, it would make it much
harder for the "average" websurfur to "steal" the image,
since he/she wouldnt be able to just right-click on it and
select save as... (as someone also mentioned, he bought
a java class that did this)

but like i said before, if that image is viewable on the computer
monitor, it's impossible to protect it if someone wants to steal
it bad enough.

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