dvwp - grouping onclick="javascript:ExpGroupBy(this) does not expand

I have a dvwp in 2013, simple grouping which collapses but does not expand

I use onclick="javascript:ExpGroupBy(this) to expand and collapse.... any help would be appreciated

<xsl:template name="dvt_1.groupheader0">
  <xsl:param name="fieldtitle" />
  <xsl:param name="fieldname" />
  <xsl:param name="fieldvalue" />
  <xsl:param name="fieldtype" />
  <xsl:param name="nodeset" />
  <xsl:param name="groupid" />
  <xsl:param name="displaystyle" />
  <xsl:param name="imagesrc" />
  <xsl:param name="alttext" />
  <xsl:param name="altname" />
  <xsl:param name="hidedetail" />
  <xsl:param name="showheader" />
  <xsl:param name="showheadercolumn" />
  <xsl:if test="$showheader" ddwrt:cf_ignore="1">
   <tr id="group{$groupid}" style="display:{$displaystyle}">

    <td class="ms-gb" colspan="99">
     <xsl:choose>
      <xsl:when test="$groupid='0' or $groupid='9'">
       <xsl:text>Nothin!!</xsl:text>
      </xsl:when>
      <xsl:when test="$groupid='1'">
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
      </xsl:when>
      <xsl:when test="$groupid='2'">
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
      </xsl:when>
      <xsl:when test="$groupid='3'">
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
      </xsl:when>
      <xsl:when test="$groupid='4'">
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
      </xsl:when>
      <xsl:when test="$groupid='5'">
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
      </xsl:when>
      <xsl:when test="$groupid='6'">
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
       <xsl:text disable-output-escaping="yes" ddwrt:nbsp-preserve="yes">&amp;nbsp;</xsl:text>
      </xsl:when>
     </xsl:choose>

        <xsl:if test="not($hidedetail)" ddwrt:cf_ignore="1">
       <a href="javascript:" onclick="javascript:ExpGroupBy(this);return false;"> 
<img src="{$imagesrc}" border="0" alt="{$alttext}" name="{$altname}"  style=" visibility: hidden"/> 
<xsl:value-of select="$fieldtitle" />
</a>     </xsl:if>