one good trick i liked to use for image protection and other things (not fixing the screen capture thing, but just to keep MOST users from playing around with it)...is to create a blank layer the width of the browser over top of everything. That way, they can right click on the picture all they want, but it won't show them the save as, print, or other things in the image right click menu...

i prefer that to the disable right click because those right click messages are annoying at best.