I have sub navigation within my site that displays all nav from levels 2 / 3 / 4 however the current XSLT I am using, which has been applied from another post on this forum, displays all nodes open. I need this to only show the descendants of the current node we are on. Here is my XSLT:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [
  <!ENTITY nbsp "&#x00A0;">
]>
<xsl:stylesheet
  version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:msxml="urn:schemas-microsoft-com:xslt"
  xmlns:umbraco.library="urn:umbraco.library"
  exclude-result-prefixes="msxml umbraco.library">

  <xsl:output method="xml" omit-xml-declaration="yes"/>

  <xsl:param name="currentPage"/>

  <xsl:variable name="parentNode" select="$currentPage/ancestor-or-self::*[@isDoc and @level = 2]"/>

  <xsl:template match="/">
    <!-- Level 2 -->
    <h1>
      <a href="{umbraco.library:NiceUrl($parentNode/@id)}">
        <xsl:value-of select="$parentNode/@nodeName"/>
      </a>
    </h1>

    <!--Level 3-->
    <xsl:if test="count($parentNode/*[@isDoc and string(umbracoNaviHide)!='1']) &gt; 0">
      <ul id="secondary-navigation">
        <xsl:for-each select="$parentNode/*[@isDoc and string(umbracoNaviHide)!='1']">
          <li>
            <a href="{umbraco.library:NiceUrl(@id)}">
             <xsl:value-of select="@nodeName"/>
            </a>

            <!--Level 4-->
            <xsl:if test="count(*[@isDoc and string(umbracoNaviHide)!='1']) &gt; 0">
              <ul class="subnav">
                <xsl:for-each select="*[@isDoc and string(umbracoNaviHide)!='1']">
                  <li>
                    <a href="{umbraco.library:NiceUrl(@id)}">
                      <xsl:value-of select="@nodeName"/>
                    </a>
                  </li>
                </xsl:for-each>
              </ul>
            </xsl:if>
          </li>
        </xsl:for-each>
      </ul>
    </xsl:if>

  </xsl:template>

</xsl:stylesheet>

This displays as follows (apologies for the black lines - confidentiality and all that) but it gives an idea. I iodally just need to show one of these sections at a time. i.e When you click the node named 'Testing' then the other two nodes with arrows on them would not be expanded but the 'Testing' node and all of its children would be expanded. Any help greatly appreciated.