You can now use a built-in PGN viewer in this forum.

This:

[PGN]
[Event "IBM Kasparov vs. Deep Blue Rematch"]
[Site "New York, NY USA"]
[Date "1997.05.11"]
[Round "6"]
[White "Deep Blue"]
[Black "Kasparov, Garry"]
[Result "1-0"]

1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Ng5 Ngf6 6.Bd3 e6 7.N1f3 h6 8.Nxe6 Qe7 9.O-O fxe6 10.Bg6+ Kd8 {Kasparov shakes his head} 11.Bf4 b5 12.a4 Bb7 13.Re1 Nd5 14.Bg3 Kc8 15.axb5 cxb5 16.Qd3 Bc6 17.Bf5 exf5 18.Rxe7 Bxe7 19.c4 1-0
[/PGN]

Will look like this:


[Event "IBM Kasparov vs. Deep Blue Rematch"] [Site "New York, NY USA"] [Date "1997.05.11"] [Round "6"] [White "Deep Blue"] [Black "Kasparov, Garry"] [Result "1-0"] 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Ng5 Ngf6 6.Bd3 e6 7.N1f3 h6 8.Nxe6 Qe7 9.O-O fxe6 10.Bg6+ Kd8 {Kasparov shakes his head} 11.Bf4 b5 12.a4 Bb7 13.Re1 Nd5 14.Bg3 Kc8 15.axb5 cxb5 16.Qd3 Bc6 17.Bf5 exf5 18.Rxe7 Bxe7 19.c4 1-0


There is a PGN button on your "advanced mode" editor screen.

Also, the viewer supports FEN descriptions in the PGN of the starting position, and it will also display multiple games with a drop-down menu, rather than having to make a new viewer window for each game.