[xsl] Parameter problem

HI

I am trying to calculate the difference between the first and last
elements in a node set.
In the template  PartyList/When[1] i have declared a global variable
firstN, and i am passing it as a parameter to the template
PartyList/When[last()].
The problem;  in the template  PartyList/When[last], the parameter
(first) does not have a value associated with it.

My xml file:


<PartyTime>
	<PartyListType="Energy">
		<When DateTime="Thursday 12 November 2002 11:51"
Attendance="50"/>
		<When DateTime="Thursday 09 November 2002 11:53"
Attendance="51"/>
		<When DateTime="Thursday 28 November 2002 11:58"
Attendance="56"/>
		<When DateTime="Thursday 30 November 2002 16:55"
Attendance="57"/>
	</PartyList>
</PartyTime>


Mt xsl file:

<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>

<xsl:template match="/">
	<HTML>
	<HEAD>
		<TITLE>Party List</TITLE>
		<LINK REL="stylesheet" TYPE="text/css" HREF="party.css"
/>
	</HEAD>
	<BODY>
		<H1>Party Report</H1>

		<H3>From <xsl:value-of select="//DateFrom"/> To
<xsl:value-of select="//DateTo"/></H3>
		<H3></H3>

		<xsl:apply-templates />
	</BODY>
	</HTML>
</xsl:template>

<xsl:template match="PartyList">
	<H3>PartyList</H3>
	<xsl:apply-templates select="When [@Attendance]">
			<xsl:sort select="@Attendance" order="ascending"
data-type="number"/>	
	</xsl:apply-templates>
</xsl:template>

<xsl:template match="PartyList/When [last()]">

	<xsl:param name = "first"/>
	<xsl:param name = "last"><xsl:value-of
select="@Attendance"/></xsl:param>

	<xsl:variable name="difference"><xsl:value-of select = "$last -
$first"/></xsl:variable>
	<TD><xsl:value-of select="$first"/></TD>
	<TD><xsl:value-of select="$last"/></TD>
	<TD><xsl:value-of select="$difference"/></TD>
	
</xsl:template>

<xsl:template match="PartyList/When [1]">

	<xsl:variable name="firstN"><xsl:value-of
select="@Attendance"/></xsl:variable>
	<TD><xsl:value-of select="$firstN"/></TD>       <!-- I included
this to test if the variable has a value - and it does-->
	
	<xsl:apply-templates select="PartyList/When [last()]">
		<xsl:with-param name="first"><xsl:copy-of
select="$firstN"/></xsl:with-param>
	</xsl:apply-templates>

</xsl:template>

</xsl:stylesheet>

I know there are many parameter problems in the list, but can't seem to
find the answer.
Any help would be much appreciated.

Kind Regards
marsha





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