How to make custom loading screens?

[ZyLogicX]

So, I am currently working on my Full Conversion mod named "The Elder Sign: The Asylum" and I want to create my own loading screen (everytime you go through a level_hub door)

Basically it says on default "Loading..."

But how do I make it say something else, and with a different background image like this: (but with text ofcourse, taken from La Caza)


Much appreciated if anyone could help me.