diff --git a/xsl/header.xsl b/xsl/header.xsl
index 9b5c27a24..144db8706 100644
--- a/xsl/header.xsl
+++ b/xsl/header.xsl
@@ -39,18 +39,18 @@
 
   <xsl:if test="/page/calendar-summary">
     <script src="{$baseurl}script/calendar.js"
-            type="text/javascript">
+            type="text/javascript" defer="defer">
       <xsl:text>
 </xsl:text>
     </script>
   </xsl:if>
   <script src="{$baseurl}script/jquery-1.4.2.min.js"
-          type="text/javascript">
+          type="text/javascript" defer="defer">
     <xsl:text>
 </xsl:text>
   </script>
   <script src="{$baseurl}script/pentamedia-comments.js"
-          type="text/javascript">
+          type="text/javascript" defer="defer">
     <xsl:text>
 </xsl:text>
   </script>