Java EE (Java Enterprise Edition) General Discussion

I have JSTL 1.1 installed, am using J2EE 1.3 on Websphere 5.0 and am referencing 2.3 DTD in my web.xml. I have the jstl.jar, standard.jar, jdbc2_0-stdext.jar, xalan.jar and xercesImpl.jar in WEB-INF/lib

I can successfully use the core JSTL functions with
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %> but have not been able to get the functions URI to work.

I have tried the two listed below
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<%@ taglib uri="http://java.sun.com/jstl/functions" prefix="fn" %>

but get the error:
[Servlet Error]-[File "http://java.sun.com/jsp/jstl/functions" not found]: org.apache.jasper.JasperException: File "http://java.sun.com/jsp/jstl/functions" not found

Can someone please tell me what I am doing wrong or if I am trying to use something that I shouldn't with my setup. I have only started using JSTL this week and have a lot left to learn.

Thanks!