I have a sample xml file as follows:

 <?xml version="1.0" encoding="utf-8" ?>
<Countries>
    <Country>
        <CountryName>United States</CountryName>
        <Population>300 million</Population>
        <Government>Federal Republic</Government>
    </Country>
    <Country>
        <CountryName>Japan</CountryName>
        <Population>72 million</Population>
        <Government>Constitutional Monarchy</Government>
    </Country>
</Countries>

I then have a javascript code as follows:

<script type="text/javascript">
   
    var xmlobj=new CreateNewObject();
   
    function LoadCustomers()
    {
    if (xmlobj)
    {
      xmlobj.open("GET", "http://" + location.host + "/Website1/test.xml", false);
      xmlobj.send(null);
      if (xmlobj.status==200)
      {
        var xmlDoc=xmlobj.responseXML;
        var nodes=xmlDoc.selectNodes("//Countries/Country/Name/text()");
        var ctrl=document.getElementById("ddlCustomers");
        for (var i=0; i<nodes.length; i++)
        {
        var name=nodes[i].nodeValue;
        var htmlCode=document.createElement('option');
        ctrl.options.add(htmlCode);
        htmlCode.text=name;
        htmlCode.value=name;
        }
      } else
      {
        alert('There was a problem retrieving data');
      }
    }
    }
   
    function DispCustomers()
    {
        var xmlobj=new CreateNewObject();
        if (xmlobj)
        {
            xmlobj.open("GET", "http://" + location.host + "/Website1/test.xml", true);
            xmlobj.onreadystatechange=function()
            {
                if (xmlobj.readyState==READYSTATE_COMPLETE)
                {
                    var ctrl=document.getElementById("ddlCustomers");
                    var doc=xmlobj.responseXML;
                    var countryname=ctrl.options[ctrl.selectedIndex].value;
                    var node=doc.selectSingleNode("//Countries/Country[CountryName='" + countryname + "']");
       Error line here----> var details='Population: ' + node.selectSingleNode('Population/text()').nodeValue + '. Type of Government: ' + node.selectSingleNode('Government/text()').nodeValue;
                    document.getElementById("divResults").childNodes[0].nodeValue=details;                   
                   
                }
            }
            xmlobj.send(null);
        }
    }
    </script>

For some reason I am getting the error above when I debug.  I can't seem to see the problem.  All it is is a string variable.  

Some please help.  Any would be appreciated.

Error line here----> var details='Population: ' + node.selectSingleNode('Population/text()').nodeValue + '. Type of Government: ' + node.selectSingleNode('Government/text()').nodeValue;