Hi there ! 

I'm dev this function to add a new vote or count +1 in a node for each selection in js..

    <!-- start writing XSLT -->

    <xsl:variable name="documentTypeAlias" select="string('Quiz')"/>

    <xsl:variable name="options" select="string('QuizOptions')"/>

    <script type="text/javascript">

      ...

      iSend = $("#content input[name=quiz]:checked").val();

      ...

    </script>

    <xsl:variable name="tmp">

      <xsl:value-of select="isend"/>

    </xsl:variable>

    <xsl:variable name="myvar" select="number($tmp)"/>

    <xsl:value-of select="visitTrack:updateVisit($myvar)"/>

  </xsl:template>

  <msxml:script language="C#" implements-prefix="visitTrack">

    <msxml:assembly href="../bin/cms.dll" />

    <msxml:assembly href="../bin/umbraco.dll" />

    <msxml:assembly href="../bin/businesslogic.dll" />

    <msxml:using namespace="umbraco.BusinessLogic" />

    <msxml:using namespace="umbraco.cms.businesslogic.web" />

    <msxml:using namespace="umbraco.cms.businesslogic.web" />

    public static string updateVisit(int myvar)

    {

    User author = User.GetUser(0);

    Document doc = new Document(myvar);

    int getCount=int.Parse(doc.getProperty("numberanswers").Value.ToString()) + 1;

    doc.getProperty("numberanswers").Value = getCount.ToString();

    doc.Publish(author);

    umbraco.library.UpdateDocumentCache(doc.Id);

    return getCount.ToString();

    }

  </msxml:script>

</xsl:stylesheet>

But it present this error: Value was either too large or too small for an Int32. 

And I not sure that it works completely

Someone can help me ??? 

Thanks...