Topic: xpath problems again, thanks in advance

hi hi,

can i know whether variable in xsl can hold the previous value?
this is the idea what i want to do..i know the syntax is wrong

<xsl:param name ="counter"/>

<xsl: for each select ="tr">
<xsl:if test="normalize-space(TD[2]/text()) != '' ">
<xsl:value-of select="concat($counter, TD[2]/text())" />
</xsl:if>
</xsl:for-each>

this code didnt work, is it possible the $counter will hold the previous value?

thanks