I am getting crazy. Can't access XML contents in Firefox.

Hello sirs,


I am trying to send a POST request to a webservice on the click of a
button. This will return me an XML document with a list of combo box
items.


The problem: in FIREFOX, when the get the XmlDocument from the
XmlHttpRequest object, I can't access its contents. I keep getting
empty strings and "null".


This is my code:


---


function GetComboBoxItems(p_strType, p_strCode)
{
        var objParameters = new Array();
        objParameters[0] = p_strType;
        objParameters[1] = p_strCode;


        var objHttpRequest =

SendRequest("/MeuWebService/MyWebService.asmx/GetComboBoxIte­ms",
objParameters);


        alert(objHttpRequest.responseT­ext);   // alerts the XML doc
(see below)


        /*


        this is the XML document:


        <?xml version="1.0" enconding="utf-8"?>
        <ReturnDocument>
          <ComboItem>
             <Key>1</Key>
             <Description>My first item</Description>
          </ComboItem>
          <ComboItem>
             <Key>2</Key>
             <Description>My second item</Description>
          </ComboItem>
        </ReturnDocument>


        */


        alert(objHttpRequest.responseX­ML);  // alerts '[object
XMLDocument]'


        var XmlDoc = objHttpRequest.responseXML;


        var arrTemp =
XmlDoc.documentElement.getElem­entsByTagName("ComboItem");


        alert(arrTemp.length); // alerts '2'


        // show contents (Firefox)
        for(var i = 0; i < arrTemp.length; i++)
        {
           alert(arrTemp[i].childNodes[0]­.nodeValue); // alerts empty
string
           alert(arrTemp[i].childNodes[1]­.nodeValue); // alerts
'null'
        }


        /*
        // show contents (IE) - works perfectly
        for(var i = 0; i < arrTemp.length; i++)
        {
           alert(arrTemp[i].childNodes[0]­.text);
           alert(arrTemp[i].childNodes[1]­.text);
           alert(arrTemp[i].childNodes[2]­.text);
        }  */



}


---

I searched everywhere for a logic explanation, but couldn't find any.


In IE it works perfectly. What am I doing wrong? 


TIA, 
Leonardo