<replace css:theme-children="div#menu ul">
<xsl:for-each select="//ul[@id='portal-globalnav']/li">
<xsl:element name="li">
<xsl:if test="./@class = 'selected'">
<xsl:attribute name="class">
current_page_item
</xsl:attribute>
</xsl:if>
<xsl:copy-of select="./a" />
</xsl:element>
</xsl:for-each>
</replace>