[xsl] concating strings in a loop

[Herwig Posedu <herwig.posedu@xxxxxxxxxx>]

hi!
i want to display a list of persons "comma-seperarted" on my pdf-file.
how can i concate those person-names seperated with a "," but in that 
way, that after the last name is no ",".
i did it like this

<xsl:for-each select="person">
<xsl:value-of select="name" />
,<fo:inline color="white">.</fo:inline>
</xsl:for-each>
-> the output for example is: mike, john,
-> i want to have: mike, john
how can i concate the strings and substring it, so that the last comma 
will be removed

thx for help
--
Herwig Posedu



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