>>I had planned to use a javascript function to not allow right-clicking
and saving the image...

Forget this: this is just a gadget. It will only prevent people from copying the image 
who
would be too dumb to print it anyway.
You don't need to come from Harvard to know how to get an image from the cache,
or get its address directly from the source page, or even just capture the image on 
the screen.

>>the onscreen display image would only be a 320 pixel wide image,

This is definitely a much better security.

>>I'll probably check into CFX_stampImage, also.

While you pass by, also check for CF_picture frame, it could add a plus to your 
presentation.

>>What do you think about the approach of using an array to store selections
from each page and then dumping the array contents onscreen for review, then into a db
upon checkout...

It could be an array or just using variables in the form scope.
You could also look at techniques used by some shoping cart systems.
There are a couple in the CF gallery.



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