My last website ad some Java that disabled right clicking but it was not an eCommerce site. .
The 'ol disable right click used to be all the rage but since browsers make it so easy to disable JavaScript you'd be adding extra code for nothing. The downloads would still happen. If someone wants a pic on the internet they can grab it with ease.
FYI: Some browser even ignore the right click 'disable' request so will still show you the menu...
You could make it hard through some elaborate jigsaw construction (as per used on stock image sites) but that would be quite the task.