Figure it out yourself. It'll help you a lot in the long run.
Here is the mapping links thread. It links to a few useful sites regarding shaders. More specifically,
this talks about fogparms; the value you'll need to set in the shader. To get your RGB values, you can go
here or
here.
Don't say you can't, because you can. Say you won't, and then GTFO.
Alternatively you could find the link to that map by OverFlow that has orange fog.