<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"><!-- PARAMETERS --><xslaram name="link_path" />....
xslProc.addParameter("link_path","home/subdir");
<a><xsl:attribute name="href"><xsl:value select="$link_path" /></xsl:attribute>welcome.htm</a>