Custom Loading Screens?

Well, i've been looking around and stuff. I can't seem to find out how to make a custom loading screen. HOW DO YOU DO IT!?

Only way it works if u edit the blp then add to the patch MPQ u cant put it in map ---grr i hated it when i found out---

It's not for b.net, it's for Gaiden. So, we have to take out the loading screen in pieces, edit it, and put it in the b.net update? That shouldn't be that ad.

then i hope that your gonna make a complete mod because then we will need that same patch in order to see it