Here is my content node tree:

The site root "The Patient Experience" will have no left hand navigation, but first-level sub-pages beneath it will. Right now the only sub-page is "Patient and Family Centered Care", but there will be others.

So here's what I'd like to do. Each page that is one level below the root should include a left hand navigation that shows itself plus its children in a single-level list. Therefore once a visitor clicks on "Patient and Family-Centered Care", from the root, the subnav markup should be:

<ul id="contextNav">
  <li><a href="/patient-and-family-centered-care/" class="currentPage">Patient and Family Centered Care</a></li>
  <li><a href="/patient-and-family-centered-care/smh-mission-and-vision.aspx">SMH Mission and Vision</a></li>
  <li><a href="/patient-and-family-centered-care/our-principles-of-patient-and-family-centered-care.aspx">Our Principles of Patient- and Family-Centered Care</a></li>
</ul>

Once a visitor clicks on "SMH Mission and Vision" the markup should be:

<ul id="contextNav">
    <li><a href="/patient-and-family-centered-care/">Patient and Family Centered Care</a></li>
    <li><a href="/patient-and-family-centered-care/smh-mission-and-vision.aspx" class="currentPage">SMH Mission and Vision</a></li>
    <li><a href="/patient-and-family-centered-care/our-principles-of-patient-and-family-centered-care.aspx">Our Principles of Patient- and Family-Centered Care</a></li>
</ul>

Please note that I do NOT want this...

<ul id="contextNav">
    <li><a href="/patient-and-family-centered-care/">Patient and Family Centered Care</a>
        <ul>
            <li><a href="/patient-and-family-centered-care/smh-mission-and-vision.aspx" class="currentPage">SMH Mission and Vision</a></li>
            <li><a href="/patient-and-family-centered-care/our-principles-of-patient-and-family-centered-care.aspx">Our Principles of Patient- and Family-Centered Care</a></li>
        </ul>
    </li> 
</ul>

So here's my XSL, which is basically the default helper XSL:

<xsl:variable name="level" select="2"/>

<xsl:template match="/">

  <!-- The fun starts here -->
  <ul id="contextNav">
    <!-- Home node added here -->
      <li>
    <a href="/">Home</a>
      </li>
    <!-- Loop through site -->
    <xsl:for-each select="$currentPage/ancestor-or-self::* [@isDoc and @level=$level]/* [@isDoc and string(umbracoNaviHide) != '1']">
      <li>
        <a href="{umbraco.library:NiceUrl(@id)}">
          <xsl:if test="$currentPage/ancestor-or-self::*/@id = current()/@id">
            <!-- we're under the item - you can do your own styling here -->
            <xsl:attribute name="class">currentPage</xsl:attribute>
          </xsl:if>
          <xsl:value-of select="@nodeName"/>
        </a>
      </li>
    </xsl:for-each>
  </ul>

</xsl:template>

I hope someone can help me with what I'm trying to do here. XSL is confusing as heck to me and the Umbraco schema doesn't make it any easier.