diff --git a/widget/public/MANIFEST_IDL b/widget/public/MANIFEST_IDL
index 0c569914843..f069677fa44 100644
--- a/widget/public/MANIFEST_IDL
+++ b/widget/public/MANIFEST_IDL
@@ -3,6 +3,7 @@
 #
 
 nsIAppShell.idl
+nsIBidiKeyboard.idl
 nsIFilePicker.idl
 nsIFileSpecWithUI.idl
 nsISound.idl
diff --git a/widget/public/Makefile.in b/widget/public/Makefile.in
index aed6b64ea44..a1aad2b1449 100644
--- a/widget/public/Makefile.in
+++ b/widget/public/Makefile.in
@@ -87,6 +87,7 @@ XPIDLSRCS	= \
 		nsIRollupListener.idl \
 		nsIMenuRollup.idl \
 		nsIBaseWindow.idl \
+		nsIBidiKeyboard.idl \
 		nsIXRemoteClient.idl \
 		$(NULL)
 
diff --git a/widget/public/makefile.win b/widget/public/makefile.win
index 583ea4f86f6..e9ed5385c7a 100644
--- a/widget/public/makefile.win
+++ b/widget/public/makefile.win
@@ -43,6 +43,7 @@ XPIDLSRCS =               \
   .\nsIRollupListener.idl \
   .\nsIMenuRollup.idl \
   .\nsIBaseWindow.idl \
+  .\nsIBidiKeyboard.idl \
   $(NULL)
 
 EXPORTS=\
diff --git a/widget/public/nsIBidiKeyboard.idl b/widget/public/nsIBidiKeyboard.idl
new file mode 100644
index 00000000000..47af5d6b60c
--- /dev/null
+++ b/widget/public/nsIBidiKeyboard.idl
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Mozilla Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/MPL/
+ * 
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ * 
+ * The Original Code is IBM code.
+ * 
+ * The Initial Developer of the Original Code is IBM.
+ * Portions created by IBM are
+ * Copyright (C) International Business Machines
+ * Corporation, 2000.  All Rights Reserved.
+ * 
+ * Contributor(s): Simon Montagu
+ */
+
+#include "nsISupports.idl"
+
+[scriptable, uuid(BB961AE1-7432-11d4-B77A-00104B4119F8)]
+interface nsIBidiKeyboard : nsISupports
+{
+  /**
+   * Determines if the current keyboard language is right-to-left
+   */
+  void isLangRTL(out PRBool aIsRTL);
+
+  /**
+   * Sets the keyboard language to left-to-right or right-to-left
+   * @param aLevel - if odd set the keyboard to RTL, if even set LTR 
+   */
+  void setLangFromBidiLevel(in PRUint8 aLevel);
+};
+
diff --git a/widget/public/nsWidgetsCID.h b/widget/public/nsWidgetsCID.h
index aecdfc87b5a..07d0da3323a 100644
--- a/widget/public/nsWidgetsCID.h
+++ b/widget/public/nsWidgetsCID.h
@@ -213,3 +213,8 @@
 // {B148EED2-236D-11d3-B35C-00A0CC3C1CDE}
 #define NS_SOUND_CID \
 { 0xb148eed2, 0x236d, 0x11d3, { 0xb3, 0x5c, 0x0, 0xa0, 0xcc, 0x3c, 0x1c, 0xde } }
+
+// {2572E6B0-7439-11d4-B77A-00104B4119F8}
+#define NS_BIDIKEYBOARD_CID \
+{ 0x2572e6b0, 0x7439, 0x11d4, { 0xb7, 0x7a, 0x0, 0x10, 0x4b, 0x41, 0x19, 0xf8 } }
+