Need a gmod collision script.

Gmod 13 seems to have screwed up my gamemodes collisions.

Im running a edited version of a gamemode called ZombieSurivival.

Theres 2 teams - Humans and Zombies, I need a script so that humans can walk through humans

and zombies can walk through zombies. Thats basically it.

TEAM_ZOMBIE
TEAM_UNDEAD = TEAM_ZOMBIE
TEAM_SURVIVORS
TEAM_HUMAN = TEAM_SURVIVORS

Thank you in advance if you need to contact steam is Cevadar - slashnebula