can't use xsl:variable or xsl:sort

I'm using IE5.5.  I'm trying to run this xsl:

<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl" version="1.0">
<xsl:template match="/">

  <xsl:for-each select="ndsOptionsMenu">
    <xsl:for-each select="option">
      <xsl:variable name="thisVal" select="text"/>
    </xsl:for-each>
  </xsl:for-each>
</xsl:template>
</xsl:stylesheet>

This isn't all I want to do but it shows my problem.  When I run this I
get:

Keyword xsl:variable may not be used here.

The same thing happens with xsl:sort.  Does anyone know why this is?

Thanks.

 Oh, just in case here is my XML:

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="ndsoptionsmenutest.xsl"?>
<ndsOptionsMenu>
  <title>XML/XSL Demo (Options)</title>
  <option>
    <text>Use Customer?</text>
    <value>Y</value>
  </option>
  <option>
    <text>Use Sales Rep?</text>
    <value>Y</value>
  </option>
</ndsOptionsMenu>


--
Lewis Cunningham
NDS Systems
Tel : 727-538-2250
Mail: lewis@xxxxxxxxxxx
Web : www.ndsapps.com



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