public OnZombieRoam()
{
	for(new npcid = 0; npcid < MAX_ZOMBIES; npcid++)
	{
	    if(IsPlayerNPC(npcid))
	    {
	        if(GetRNPCHealth(npcid) > 0)
	        {
		        new victim = GetZombieVictim(npcid), Float:x, Float:y, Float:z;
				GetPlayerPos(npcid, x, y, z);
				if(victim == INVALID_PLAYER_ID)
			  	{
					new pos = random(4);
					if(pos == 0) { x = x + 100.0; }
					else if(pos == 1) { x = x - 100.0; }
					else if(pos == 2) { y = y + 100.0; }
					else if(pos == 3) { y = y - 100.0; }

					GetZombieVictimID[npcid] = INVALID_PLAYER_ID;

					RNPC_SetKeys(0);

					MoveRNPC(npcid, x, y, z, RNPC_SPEED_WALK, 1);
			 	}
			}
		}
	}
	return 1;
}