diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index 285b7e1d0d0a6..eb301d3ab1b42 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -33,9 +33,9 @@ function print_header ($title="", $heading="", $navigation="", $focus="", $meta=
 
     if (!$button and $navigation) {
         if (isset($USER->id)) {
-            $button = "<FONT SIZE=2><A HREF=\"$CFG->wwwroot/login/logout.php\">".get_string("logout")."</A></FONT>";
+            $button = "<FONT SIZE=2><A TARGET=_parent HREF=\"$CFG->wwwroot/login/logout.php\">".get_string("logout")."</A></FONT>";
         } else {
-            $button = "<FONT SIZE=2><A HREF=\"$CFG->wwwroot/login/index.php\">".get_string("login")."</A></FONT>";
+            $button = "<FONT SIZE=2><A TARGET=_parent HREF=\"$CFG->wwwroot/login/index.php\">".get_string("login")."</A></FONT>";
         }
     }