xmlhttp.responseXML parsing

Hi guys,

I am using the following code snippet to parse an xmlhttp request:

if(xmlhttp.responseXML)  {
    var xmlresponce = xmlhttp.responseXML;

     if(xmlresponce.documentElement.tagName == "parsererror"){
                  var parseErrorText =
xmlresponce.documentElement.firstChild.data;
                  parseErrorText += "\n" +
xmlresponce.documentElement.firstChild.nextSibling.firstChild.data;
      alert(parseErrorText);
      return;
    }

    var update_count =
xmlresponce.getElementsByTagName("updates")[0].firstChild.nodeValue;
     var error_count =
xmlresponce.getElementsByTagName("errors")[0].firstChild.nodeValue;
}

Now if I send the following XML (from the server)
<?xml version = "1.0"?>
<responce>
 <errors>0</errors>
 <updates>2</updates>
</responce>

I get a parsing error in firefox (it complains about <?xml version = "1.0"?>
!!??)

So sending the following simple xml works:
<responce>
 <errors>0</errors>
 <updates>2</updates>
</responce>

Could anyone clarify how firefox parses the responseXML ? I don't see why it
should fail parsing the xml tag.. This works well in IE, shouldn't it be
best to allow specifying the xml version and encoding.. ?

I'm using firefox v1.0.6 on windows xp

best,
jon