need a variable path in the template-match attribut

Hello!

I need an XSLT which copies all nodes to a new XML, but one tag needs to be
changed. This should be done with a variable because I want to use it in
Apache Cocoon and want to call the stylesheet with a parameter like this:
http://localhost:8080/cocoon/edit?mypath=//ad/new

<xsl:param name="mypath"/>
<xsl:template match="@*|node()">
	<xsl:copy>
	  <xsl:apply-templates select="@*|node()"/>
	</xsl:copy>
</xsl:template>
<xsl:template match="$mypath">
	<xsl:copy>New Text Here</xsl:copy>
</xsl:template>

I know that I can't use variable-references in the match attribut in
templates. But I think this should be possible in some way ;)
Thanks for your help!
Markus Karsch

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