Your question wasn't very clear but i think you want to go from
<TotalPages>37</TotalPages>
to
<a href="page1.html">1</a>
...
<a href="page37.html">37</a>
which would be something like
<xsl:template match="TotalPages">
<xsl:param name="x" select="."/>
<xsl:if test="$x != 1">
<xsl:apply-templates select="."/>
<xsl:with-param name="x" select="$x - 1"/>
</xsl:apply-templates>
</xsl:if>
<a href="page{$x}.html"><xsl:value-of select="$x"/></a>
</xsl:template>
David
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