@John Huebner:
Thanks for the tips.
I think I’ve got this working.
I changed the references to the field name, and I commented-out the extension validation.
I now have an image showing beneath my URL textbox.
So I guess this will now try to interpret ALL URL field types as images, is that right?
If so, sounds like it would be useful to be able to create a separate field type and have that be the image-from-a-URL.
Thanks.
