Conditional processing for first and last of a set of

Hi everyone,
I have a series of br elements scattered throughout an xhtml document. I would like to change the very first <br> to '<tr><td>', the intervening ones to '</td></tr><tr><td>', and the last one to '</td></tr>'
I have got this template at teh moment
  <xsl:template match="//br[text()='LineNumberHolder']">
    <xsl:choose>
    <xsl:when test="position()=//br[text()='LineNumberHolder'][position()=1]">
	    <xsl:text disable-output-escaping="yes">&lt;tr>&lt;td></xsl:text>
    </xsl:when>
    <xsl:when test="position()=//br[text()='LineNumberHolder'][last()]">
	    <xsl:text disable-output-escaping="yes">&lt;\td>&lt;\tr></xsl:text>
    </xsl:when>
    <xsl:otherwise>
	    <xsl:text disable-output-escaping="yes">&lt;\td>&lt;\tr>&lt;tr>&lt;td></xsl:text>
    </xsl:otherwise>    
    </xsl:choose>
  </xsl:template>

However, it changes all <br> tags to '<\td><\tr><tr><td>'
Please could someone tell me what I'm doing wrong?
Thanks,
Munna
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