they must be some pretty **** good images....
there's always a way around things....for this you'd have to cross develop from each browswer...i know you can disable right clicking and stuff through javascript, and if you put your images all as flash, they'd have to do a lot of work to save it...
then if you disable print screen option, it may work fine in windows...but linux or mac people may be able to still grab it...
i don't know, but i thing that's a lot of work to protect images...are these like photoshop creations or photography or something?
if you use php and have the gd libarires installed you can plaster a big copyright 2004 to me over all images that you want...
it may be done, but i think that it would be to hard to work around every browser & os there is