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diff --git a/indra/newview/llviewerhelputil.cpp b/indra/newview/llviewerhelputil.cpp
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+/** 
+ * @file llviewerhelp.cpp
+ * @brief Utility functions for the Help system
+ * @author Soft Linden
+ *
+ * $LicenseInfo:firstyear=2009&license=viewergpl$
+ * 
+ * Copyright (c) 2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#include "llviewerprecompiledheaders.h"
+#include "llviewerhelputil.h"
+
+#include "llagent.h"
+#include "llsd.h"
+#include "llstring.h"
+#include "lluri.h"
+#include "llweb.h"
+#include "llviewercontrol.h"
+
+//////////////////////////////////////////////
+// Build a help URL from a topic and formatter
+
+//static
+std::string LLViewerHelpUtil::helpURLEncode( const std::string &component )
+{
+	// Every character rfc3986 allows as unreserved in 2.3, minus the tilde
+	// which we may grant special meaning. Yay.
+	const char* allowed =   
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	"abcdefghijklmnopqrstuvwxyz"
+	"0123456789"
+	"-._";
+	std::string escaped = LLURI::escape(component, allowed);
+	
+	return escaped;
+}
+
+//static
+std::string LLViewerHelpUtil::buildHelpURL( const std::string &topic)
+{
+	LLSD substitution;
+	substitution["TOPIC"] = helpURLEncode(topic);
+	substitution["DEBUG_MODE"] = gAgent.isGodlike() ? "/debug" : "";
+	
+	// get the help URL and expand all of the substitutions
+	// (also adds things like [LANGUAGE], [VERSION], [OS], etc.)
+	std::string helpURL = gSavedSettings.getString("HelpURLFormat");
+	return LLWeb::expandURLSubstitutions(helpURL, substitution);
+}