--- loncom/interface/lonmenu.pm	2013/11/24 15:32:39	1.422
+++ loncom/interface/lonmenu.pm	2013/11/26 00:25:32	1.423
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Routines to control the menu
 #
-# $Id: lonmenu.pm,v 1.422 2013/11/24 15:32:39 raeburn Exp $
+# $Id: lonmenu.pm,v 1.423 2013/11/26 00:25:32 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -283,8 +283,14 @@ sub primary_menu {
             $menu{$position} .= prep_menuitem($menuitem);
         }
     }
-    return ("<ol class=\"LC_primary_menu LC_floatleft\">$menu{'left'}</ol>",
-            "<ol class=\"LC_primary_menu LC_floatright LC_right\">$menu{'right'}</ol>");
+    my @output = ('','');
+    if ($menu{'left'} ne '') {
+        $output[0] = "<ol class=\"LC_primary_menu LC_floatleft\">$menu{'left'}</ol>";
+    }
+    if ($menu{'right'} ne '') {
+        $output[1] = "<ol class=\"LC_primary_menu LC_floatright LC_right\">$menu{'right'}</ol>";
+    }
+    return @output;
 }
 
 #returns hashref {user=>'',dom=>''} containing: