[TheStorm]

What you have posted Slyk is not the URC it's the shader for the loading image (but you will need that also, so it wasn't a waste of time)

If you have browsed custom maps with loadingscreens then check in the pk3 in the folder UI. You will find the URC in that one. There are only a few things that you need to change in a URC to get it to work.

Change the name and stuff in the top
Change the part that points at the loading image (the name of your loadingscreen shader)
Change the title of the map

You will need to make an 512x512 32BIT TGA picture as loading image, it should have an alpha channel (you must have the right blendfunction in the shader or else it won't show up).