Kent,
Would it be possible to write in right click protection for the images and thumbnails that are generated in the PM Classic html exporter?
Honestly, there is no real solution for keeping people from easily stealing your images. For instance with Safari (available on Mac and Windows) you just left-click and drag an image on a web page directly to your desktop. JavaScript-based hacks cannot stop this sort of thing.
Flash-based galleries (of which several are supported in the exporter) provide the best protection.
-Kirk