last of type problem

Hi all,
	I am working on a project where we are converting XML + XSL -> HTML,
currently I am using XT (thanks!). I have come across an issue that I
initially thought would be easy: creating a comma separated list. My problem
is the items I collect for the list come from separate sections of the XML
tree, and what last-of-type() tests is whether the node has following
siblings in relation to it parent, not to the collection of nodes I have
collected. Is there any way to do this?
	For example, if I have the following XML and XSL which collects a
list of DEPARTMENT nodes and tries to create HTML with a comma separated
list, I end up with a comma at the end of the list and no comma between 2
items in the middle:
	All the type A people in the company
	department 1: Fred, department 3: John department 4: Bill, 
Any suggestions?

Thanks,
Regan Gill
regan@xxxxxxxxxxx

XSL rules
<xsl:template match="COMPANY">
        <P>All the type A people in the company</P>
        <xsl:for-each select='//DEPARTMENT[TYPE="A"]'>
                department <xsl:apply-templates
select="./SECTION"/><xsl:text>: </xsl:text>
                <xsl:apply-templates select="."/>
                <xsl:if test=".[not (last-of-type())]"><xsl:text>,
</xsl:text></xsl:if>
        </xsl:for-each>
</xsl:template>
<xsl:template match="DEPARTMENT">
        <xsl:apply-templates select="EMPLOYEE"/>
</xsl:template>

sample XML
<COMPANY>
        <LOCAL>
                <DEPARTMENT>
                        <TYPE>A</TYPE>
                        <SECTION>1</SECTION>
                        <EMPLOYEE>Fred</EMPLOYEE>
                </DEPARTMENT>
                <DEPARTMENT>
                        <TYPE>B</TYPE>
                        <SECTION>2</SECTION>
                        <EMPLOYEE>Lucy</EMPLOYEE>
                </DEPARTMENT>
                <DEPARTMENT>
                        <TYPE>A</TYPE>
                        <SECTION>3</SECTION>
                        <EMPLOYEE>John</EMPLOYEE>
                </DEPARTMENT>
        </LOCAL>
        <REMOTE>
                <DEPARTMENT>
                        <TYPE>A</TYPE>
                        <SECTION>4</SECTION>
                        <EMPLOYEE>Bill</EMPLOYEE>
                </DEPARTMENT>
                <DEPARTMENT>
                        <TYPE>B</TYPE>
                        <SECTION>5</SECTION>
                        <EMPLOYEE>Charlie</EMPLOYEE>
                </DEPARTMENT>
        </REMOTE>
</COMPANY>


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