Allow for screen switching.

stepmania/Docs/SMLanProtocol.txt

@@ -188,7 +188,8 @@ NOTE: Server responces always add 128, thus a server responce for no operation
  Desc:		This introduces the server.
  Payload:
     Size	Description
-    1		Server protocol version
+    1		Server protocol version //NOTE: if protocol version is 128+, then this
+			server is an SMOnline server
     NT		Server Name
 
 003:	Allow Start
@@ -370,6 +371,9 @@ Server SMOnline packets:
 	If Room Title Update:
     NT		Room Title
     NT		Room Description
+    1		Type of room:
+		0: Chat room
+		1: Game room
 	
 	If Room List Update:
     1		Number of rooms

stepmania/Themes/default/metrics.ini

@@ -706,6 +706,7 @@ Fallback=ScreenSelectCourse
 DefaultSort=ENDLESS
 
 [ScreenNetRoom]
+MusicSelectScreen=ScreenSMOnlineSelectMusic
 TitleBGColor=0.5,0.0,0.5,1.0
 TitleBGWidth=100
 TitleBGHeight=40
@@ -740,6 +741,10 @@ PrevScreen=ScreenTitleMenu
 NextScreen=ScreenStage
 Fallback=ScreenNetSelectMusic
 
+[ScreenSMOnlineSelectMusic]
+PrevScreen=ScreenNetRoom
+Class=ScreenNetSelectMusic
+Fallback=ScreenNetSelectMusic
 
 [ScreenNetSelectMusic]
 ChatInputBoxY=SCREEN_CENTER_Y+90

stepmania/src/ScreenNetRoom.cpp

@@ -94,6 +94,12 @@ void ScreenNetRoom::HandleScreenMessage( const ScreenMessage SM )
 			{
 			case 0: //Room title Change
 				m_textTitle.SetText( NSMAN->m_SMOnlinePacket.ReadNT() + '\n' + NSMAN->m_SMOnlinePacket.ReadNT() );
+				if ( NSMAN->m_SMOnlinePacket.Read1() != 0 )
+				{
+					CString SMOnlineSelectScreen;
+					THEME->GetMetric( m_sName, "MusicSelectScreen", SMOnlineSelectScreen );
+					SCREENMAN->SetNewScreen( SMOnlineSelectScreen );
+				}
 			case 1: //Rooms list change
 				{
 					int numRooms = NSMAN->m_SMOnlinePacket.Read1();