Restrict [IMG] tag to registered members only

[atomic fireball]

This hack was already successfully created for vB2, isn't available for vB3. There seems to be some nice interest in this hack, and it would be a great addition (and a bandwidth saver) for sites with many guests and few members, etc.

The vB2 version has been discussed in this thread:
https://vborg.vbsupport.ru/showthread.php?t=57536

This hack was supplied by Lesane in the thread above, but sadly, last I heard is that he's banned and no longer here at vb.org.

Anyone want to pick this one up for vB3?

I'm looking for a hack that would allow an Admin the ability to "flip a switch" and make it so that any posts which include imbedded images (using the [IMG] tag) would be "disabled" for guests.

Instead of guests seeing the images within a post (as you normally would) they would see a replacement graphic that says something along the lines of "In order to view this image, you need to register." (Admins could make this any graphic they wish.)

I made a completely generic vb2 style graphic which could be used as a replacement. This is attached to this post. I'll be happy to update the graphic to a more vB3 style graphic if needed.

Any help with this hack would be appreciated, thanks.