[Konstantinos]

That should work.

pawn Код:

public OnPlayerStreamIn( playerid, forplayerid )
{
    if( gTeam[ playerid == gTeam[ forplayerid ] ) // CHANGE THEM TO YOURS
    {
        SetPlayerMarkerForPlayer( forplayerid, playerid, GetPlayerColor( playerid ) );
    }
}

public OnPlayerStreamOut( playerid, forplayerid )
{
    if( gTeam[ playerid == gTeam[ forplayerid ] ) // CHANGE THEM TO YOURS
    {
        SetPlayerMarkerForPlayer( forplayerid, playerid, GetPlayerColor( playerid ) );
    }
}

NOTE: You must set the color before using GetPlayerColor function.