Where did you figure out how to do this? Is there Treyarch documentation somewhere?

So I've just installed this script by alaurenc9
http://ugx-mods.com/forum/index.php/topic,11593.0.html
and when launching my map I get the following error:

unknown function
if( system_info[0] == "all" || system_info[0] == string( level.player_id_number[ localclientnum ] ) )

This is part of a .csc file that is required for this script to work. I know some scripting and to me this looks like a basic if function. What could be the problem?

In UGX Mod 1.1, a new mystery box was added. It's basically a demonic cabinet. It's a great feature, but it just doesn't fit my map. Is there any way to change it back to the regular mystery box while keeping the same UGX Mod version? Thanks