I am struggling to figure out XML and XSL as I go, so please treat me like a complete novice.

I have the following XML output from an SQL database:

- <Target>
- <Target_T Test_Run_ID="47" Target_ID="76" Target_Name_VC="auto-target12">
  <Test_T PF="1" Duration="324" />
  <Test_T PF="1" Duration="371" />
  <Test_T PF="1" Duration="166" />
  <Test_T PF="1" Duration="169" />
  <Test_T PF="2" Duration="0" />
  <Test_T PF="1" Duration="1658" />
  </Target_T>
  </Target>

I'm trying to get a sum of the Duration values, and displaying it in a table. I've created the template at the end of this message, and am calling it via the following:

<xsl:for-each select="Target/Target_T">
<TR>
<TD>
    <xsl:apply-template name="totDuration"/>
</TD>
</TR>
</xsl:for-each>

IE6 reports "Keyword xsl:apply-template may not be used here." I can't figure out why. Can anyone help me? Any hints would be most appreciated.

Here's the template:

<xsl:template name="totDuration">
  <xsl:param name="Tests" select="Test_T" />
  <xsl:param name="subtotal" select="0" />
  <xsl:choose>
    <xsl:when test="$Tests">
      <xsl:call-template name="totDuration">
        <xsl:with-param name="Tests"
                        select="$Tests[position() > 1]" />
        <xsl:with-param name="subtotal"
          select="$subtotal + substring-before($Tests[1], ':')" />
      </xsl:call-template>
    </xsl:when>
    <xsl:otherwise>
      <xsl:value-of select="$subtotal" />
    </xsl:otherwise>
  </xsl:choose>
</xsl:template>

Sorry for the double-post.