IMDb doesn't work.
Go to a site with movie stills and right click on the picture. Click on "Properties." Copy the address -- has to be a jpeg or gif image. Go to this site:
www.tinyurl.com
Use the program to get a new shortened address (which also hides any info about the image that appears in the orignal address).
Highlight and copy that new address and use the IMG button at the top of the post new reply screen here.
Hmmm -- your son recognize the images or did he give instruction on how to go to the original site of the image and look up the title from the original address (a flaw in the system)? It is tempting to peek!