It's nothing to do with the Inpaint function, but is an AviSynth command used to put something over something else:
http://avisynth.org/mediawiki/Overlay
If you can post a picture of this menu, I (or someone else) might be able to show you how it works. I've used it on many menus with obnoxious logos or some text I wanted to remove, without having to use the very slow Inpaint function.
I don't understand. Maybe someone else does.