concat Param and String in XSL

Hi!

I try to make a combination of a parameter and a string in a xsl tag.
how do i have to do this?

...
 <xsl:param name="targetdir" select="."/>

 <xsl:variable name="image-dir">../citywest1_files</xsl:variable>

 <xsl:template match="page">
   <xsl:apply-templates select="hotel"/>
 </xsl:template>


 <xsl:template match="hotel">
  <redirect:write
file="concat('$targetdir','de_hotels/hotel{@id}.html')">     --------
here it's goint wrong? what's wrong
...

Marc



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