s:property #attr working in header.jsp but not HTTP 404.jsp

[albert kao]

This line displays the proper value
   <script src="<s:property value="#attr.url"/>"></script>
in header.jsp:
   <script src="/js/myscript"/>"></script>

but displays an empty string
in http404.jsp ("Page Not Found"):
   <script src=""/>"></script>

Please help.
Thanks.