diff --git a/grade/report/grader/index.php b/grade/report/grader/index.php
index 8e44f2f8cfe..ba994fce95f 100644
--- a/grade/report/grader/index.php
+++ b/grade/report/grader/index.php
@@ -200,6 +200,7 @@ echo '<div id="hiddentooltiproot">tooltip panel</div>';
 // Print YUI tooltip code
 ?>
 <script type="text/javascript">
+//<![CDATA[
 
 YAHOO.namespace("graderreport");
 
@@ -341,7 +342,7 @@ YAHOO.graderreport.mouseoutHandler = function (e) {
 
 
 YAHOO.util.Event.onDOMReady(init);
-
+//]]>
 </script>
 <?php