[Mean]

pawn Код:

if( !strcmp( cmd, "/helmet",true ) ) {
    if( GetPVarInt( playerid, "Helmet" ) == 0 ) {
        SetPlayerAttachedObject(playerid,3 , 18645, 2, 0.07, 0.017, 0, 88, 75, 0);
        SetPVarInt( playerid, "Helmet", 1 );
    }
    else {
        RemovePlayerAttachedObject( playerid, 3 );
        SetPVarInt( playerid, "Helmet", 0 );
    }
    return 1;
}

EDIT: I wouldn't mind knowing if it worked.