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diff --git a/indra/newview/llviewerhelputil.cpp b/indra/newview/llviewerhelputil.cpp
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+++ b/indra/newview/llviewerhelputil.cpp
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+/** 
+ * @file llviewerhelp.cpp
+ * @brief Utility functions for the Help system
+ * @author Soft Linden
+ *
+ * $LicenseInfo:firstyear=2009&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#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);
+}