Looping and assigning into variable

Hi all,

How can I do this in XSLT?

	<xsl: variable name="CommentVar"/>

	<xsl:for-each select="Header">

		<!-- here i would like to get the current 'Comment'
value and 
			concatenate with the previous comment value
through above 'CommentVar', something like below-->
		<xsl:value-of
select="CommentVar=concat(Comment,$CommentVar)"/>

	</xsl:for-each>

	<!-- here I would like to get the concatenated list of all
'Comment' values -->
	<Comments>
		<xsl:value-of select="$CommentVar"/>
	</Comments>

Basically Each 'Header' element has 1 'Comment' child element in it. So
I have to loop through all headers and finally get the complete list of
concatenated 'Comment's


Thanks in advance..
VENKAT

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