[xsl] Help creating and calling xsl:functions

Hi all,

I'm having trouble getting even basic uses of xsl:function to work in my 
browsers.  I'm using this sample code, from 
http://www.xml.com/lpt/a/2003/09/03/trxml.html:
<xsl:stylesheet version="2.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
 xmlns:foo="http://whatever";>

 <!-- Compare two strings ignoring case, returning same
      values as compare(). -->
 <xsl:function name="foo:compareCI">
   <xsl:param name="string1"/>
   <xsl:param name="string2"/>
   <xsl:value-of 
select="compare(upper-case($string1),upper-case($string2))"/>
 </xsl:function>

 <xsl:template match="/">
compareCI red,blue: <xsl:value-of select="foo:compareCI('red','blue')"/>
compareCI red,red: <xsl:value-of select="foo:compareCI('red','red')"/>
compareCI red,Red: <xsl:value-of select="foo:compareCI('red','Red')"/>
compareCI red,Yellow: <xsl:value-of select="foo:compareCI('red','Yellow')"/>
 </xsl:template>

</xsl:stylesheet>

I create a "dummy" XML document, using this stylesheet, as follows:

<?xml version="1.0" ?>

<?xml-stylesheet type="text/xsl" href="fn_test.xsl" ?>

<test_tag>Nothing to see here</test_tag>

When using Firefox 1.5.0.1, I get the following error when I try to open the 
XML file in the browser:
         Error during XSLT transformation: An unknown XPath extension 
function was called.
When using IE 6.0, I get the following error:

         Namespace 'http://whatever' does not contain any functions.

Any idea why I'm not getting function calls to work?

Thanks in advance,

Will



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