public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger)
{

   for(new i =0,i<MAX_PLAYERS; i++)
     {
        if (ispassenger) return 1;
        if(IsPlayerInVehicle(i,vehicleid) && GetPlayerState(i) == PLAYER_STATE_DRIVER && GetPlayerTeam(i) ==  GetPlayerTeam(playerid)) {
            new Float:X,Float:Y,Float:Z;
            GetPlayerPos(playerid,X,Y,Z);
            SendClientMessage(playerid, -1, "Team jack is not allowed");
            SetPlayerPos(playerid,X,Y,Z+1);
          }
      }
  return 1;
}