I just realized WHY I am not getting all of the images I want. The IMG tag for
the images that are not being downloaded look like this:
src="/_internal/gxml!0/2sg2ckktshev7$jmgavl745ebyuj"

They don't have valid extensions - I assume they're being generated from a
database or something.

Maybe I can get everything in the _internal directory?
Thanks,
Jason