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diff --git a/game/server/nav_ladder.h b/game/server/nav_ladder.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//===========================================================================//
+
+// Navigation ladders
+// Author: Michael S. Booth ([email protected]), January 2003
+
+#ifndef _NAV_LADDER_H_
+#define _NAV_LADDER_H_
+
+#include "nav.h"
+
+class CNavArea;
+
+//--------------------------------------------------------------------------------------------------------------
+/**
+ * The NavLadder represents ladders in the Navigation Mesh, and their connections to adjacent NavAreas
+ * @todo Deal with ladders that allow jumping off to areas in the middle
+ */
+class CNavLadder
+{
+public:
+	CNavLadder( void )
+	{
+		m_topForwardArea = NULL;
+		m_topRightArea = NULL;
+		m_topLeftArea = NULL;
+		m_topBehindArea = NULL;
+		m_bottomArea = NULL;
+
+		// set an ID for interactive editing - loads will overwrite this
+		m_id = m_nextID++;
+	}
+
+	~CNavLadder();
+
+	void OnRoundRestart( void );			///< invoked when a game round restarts
+
+	void Save( CUtlBuffer &fileBuffer, unsigned int version ) const;
+	void Load( CUtlBuffer &fileBuffer, unsigned int version );
+
+	unsigned int GetID( void ) const	{ return m_id; }		///< return this ladder's unique ID
+	static void CompressIDs( void );							///<re-orders ladder ID's so they are continuous
+
+	enum LadderDirectionType
+	{
+		LADDER_UP = 0,
+		LADDER_DOWN,
+
+		NUM_LADDER_DIRECTIONS
+	};
+
+	Vector m_top;									///< world coords of the top of the ladder
+	Vector m_bottom;								///< world coords of the top of the ladder
+	float m_length;									///< the length of the ladder
+	float m_width;
+
+	Vector GetPosAtHeight( float height ) const;	///< Compute x,y coordinate of the ladder at a given height
+
+	CNavArea *m_topForwardArea;						///< the area at the top of the ladder
+	CNavArea *m_topLeftArea;
+	CNavArea *m_topRightArea;
+	CNavArea *m_topBehindArea;						///< area at top of ladder "behind" it - only useful for descending
+	CNavArea *m_bottomArea;							///< the area at the bottom of the ladder
+
+	bool IsConnected( const CNavArea *area, LadderDirectionType dir ) const;	///< returns true if given area is connected in given direction
+
+	void ConnectGeneratedLadder( float maxHeightAboveTopArea );		///< Connect a generated ladder to nav areas at the end of nav generation
+
+	void ConnectTo( CNavArea *area );				///< connect this ladder to given area
+	void Disconnect( CNavArea *area );				///< disconnect this ladder from given area
+
+	void OnSplit( CNavArea *original, CNavArea *alpha, CNavArea *beta );	///< when original is split into alpha and beta, update our connections
+	void OnDestroyNotify( CNavArea *dead );			///< invoked when given area is going away
+
+	void DrawLadder( void ) const;					///< Draws ladder and connections
+	void DrawConnectedAreas( void );				///< Draws connected areas
+
+	void UpdateDangling( void );					///< Checks if the ladder is dangling (bots cannot go up)
+
+	bool IsInUse( const CBasePlayer *ignore = NULL ) const;	///< return true if someone is on this ladder (other than 'ignore')
+
+	void SetDir( NavDirType dir );
+	NavDirType GetDir( void ) const;
+	const Vector &GetNormal( void ) const;
+
+	void Shift( const Vector &shift );							///< shift the nav ladder
+
+	bool IsUsableByTeam( int teamNumber ) const;
+	CBaseEntity *GetLadderEntity( void ) const;
+
+private:
+	void FindLadderEntity( void );
+
+	EHANDLE m_ladderEntity;
+
+	NavDirType m_dir;								///< which way the ladder faces (ie: surface normal of climbable side)
+	Vector m_normal;								///< surface normal of the ladder surface (or Vector-ized m_dir, if the traceline fails)
+
+	enum LadderConnectionType						///< Ladder connection directions, to facilitate iterating over connections
+	{
+		LADDER_TOP_FORWARD = 0,
+		LADDER_TOP_LEFT,
+		LADDER_TOP_RIGHT,
+		LADDER_TOP_BEHIND,
+		LADDER_BOTTOM,
+
+		NUM_LADDER_CONNECTIONS
+	};
+
+	CNavArea ** GetConnection( LadderConnectionType dir );
+
+	static unsigned int m_nextID;					///< used to allocate unique IDs
+	unsigned int m_id;								///< unique area ID
+};
+typedef CUtlVector< CNavLadder * > NavLadderVector;
+
+
+//--------------------------------------------------------------------------------------------------------------
+inline bool CNavLadder::IsUsableByTeam( int teamNumber ) const
+{
+	if ( m_ladderEntity.Get() == NULL )
+		return true;
+
+	int ladderTeamNumber = m_ladderEntity->GetTeamNumber();
+	return ( teamNumber == ladderTeamNumber || ladderTeamNumber == TEAM_UNASSIGNED );
+}
+
+
+//--------------------------------------------------------------------------------------------------------------
+inline CBaseEntity *CNavLadder::GetLadderEntity( void ) const
+{
+	return m_ladderEntity.Get();
+}
+
+
+//--------------------------------------------------------------------------------------------------------------
+inline NavDirType CNavLadder::GetDir( void ) const
+{
+	return m_dir;
+}
+
+
+//--------------------------------------------------------------------------------------------------------------
+inline const Vector &CNavLadder::GetNormal( void ) const
+{
+	return m_normal;
+}
+
+
+#endif // _NAV_LADDER_H_