[Scenario]

I don't know what you are doing with these functions:

pawn Код:

GivePlayerMoney(killerid, (PlayerInfo[playerid][pHeadValue]/2));
GivePlayerMoney(playerid, -(PlayerInfo[playerid][pHeadValue]/2));

I don't believe you need the ( and )'s. Try this:

pawn Код:

GivePlayerMoney(killerid, PlayerInfo[playerid][pHeadValue]/2);
GivePlayerMoney(playerid, -PlayerInfo[playerid][pHeadValue]/2);