Element System in Source [Modification]

[Hakahay]

Hello friends,

   Can anyone help me in the following, I am trying to create a system of elements equal to a races system, however I would like to modify the font so that anyone who defends one element can not attack another when I activate PK mode or even if it is possible in PvP. But I have no knowledge of the Source, and I do not know where to modify it to work. I would be humbly grateful to anyone who can help me.

This is the basic script I have to mount this system: http://pastebin.com/raw/gHredLke

    Sorry for my English, I'm from South America.

_{I used google translator.}