How to set up an overlay picture like in The Disciples of the Full Moon?

You can add it in the HUD.dat

background x y

or

foreground x y speed

The difference is that foreground will be drawn on top of background.

You will need to place images called Background0 or Foreground0-4 (up to 4 frames) into HUD folder.

At least I think it's like this. I haven't touched it in ages so I may be forgetting something without looking at the source

Thanks a lot Jessico!

Foreground is also animated.

Do you know if it's possible to have different hud images for different maps with scripting or some other way? I would like to make rain on one of the maps and animated hud is the only way I can think of.