XSL attribute till param

<?xml version="1.0" encoding="UTF-8"?>
<root>
 <nodeA id="2">text</nodeA>
 <nodeB id="25">text</nodeB>
</root>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" encoding="iso-8859-1" indent="yes"/>

 <xsl:template match="nodeB">
  <xsl:param name="idA" select="/root/nodeA[@id]" />
  <xsl:param name="idB" select="@id" />
 idA:<xsl:value-of select="number($idA")" />
 idB:<xsl:value-of select="number($idB")" />
 </xsl:template>

</xsl:stylesheet>