JavaScript: RetriveMultiple contacts in MS CRM 4.0 through SOAP XML

// Prepare variables to retrieve the contacts.
var searchCity = "Sammamish";
var authenticationHeader = GenerateAuthenticationHeader();
// Prepare the SOAP message.
var xml = "<?xml version='1.0' encoding='utf-8'?>"+
"<soap:Envelope xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'"+
" xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'"+
" xmlns:xsd='http://www.w3.org/2001/XMLSchema'>"+
authenticationHeader+
"<soap:Body>"+
"<RetrieveMultiple xmlns='http://schemas.microsoft.com/crm/2007/WebServices'>"+
"<query xmlns:q1='http://schemas.microsoft.com/crm/2006/Query'"+
" xsi:type='q1:QueryExpression'>"+
"<q1:EntityName>contact</q1:EntityName>"+
"<q1:ColumnSet xsi:type='q1:ColumnSet'>"+
"<q1:Attributes>"+
"<q1:Attribute>fullname</q1:Attribute>"+
"<q1:Attribute>contactid</q1:Attribute>"+
"</q1:Attributes>"+
"</q1:ColumnSet>"+
"<q1:Distinct>false</q1:Distinct>"+
"<q1:Criteria>"+
"<q1:FilterOperator>And</q1:FilterOperator>"+
"<q1:Conditions>"+
"<q1:Condition>"+
"<q1:AttributeName>address1_city</q1:AttributeName>"+
"<q1:Operator>Like</q1:Operator>"+
"<q1:Values>"+
"<q1:Value xsi:type='xsd:string'>"+searchCity+"</q1:Value>"+
"</q1:Values>"+
"</q1:Condition>"+
"</q1:Conditions>"+
"</q1:Criteria>"+
"</query>"+
"</RetrieveMultiple>"+
"</soap:Body>"+
"</soap:Envelope>";
// Prepare the xmlHttpObject and send the request.
var xHReq = new ActiveXObject("Msxml2.XMLHTTP");
xHReq.Open("POST", "/mscrmservices/2007/CrmService.asmx", false);
xHReq.setRequestHeader("SOAPAction","http://schemas.microsoft.com/crm/2007/WebServices/RetrieveMultiple");
xHReq.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
xHReq.setRequestHeader("Content-Length", xml.length);
xHReq.send(xml);
// Capture the result.
var resultXml = xHReq.responseXML;
// Check for errors.
var errorCount = resultXml.selectNodes('//error').length;
if (errorCount != 0)
{
 var msg = resultXml.selectSingleNode('//description').nodeTypedValue;
 alert(msg);
}
// Parse and display the results.
else
{
 var results = resultXml.getElementsByTagName('BusinessEntity');
 var msg = "";
 if (results.length == 0)
 {
  msg = "No contacts were found in "+searchCity+".";
  alert(msg);
  return;
 }
 else
 {
  msg = "Contacts found in "+searchCity+":\r";
  msg += "\Contact Id\t\t\t\tContact Full Name\r";
  msg +="--------------------------------------------------------------------------------\r";
    for (i=0;i < results.length;i++)
    {
     var idValue = results[i].selectSingleNode('./q1:contactid').nodeTypedValue;
     var name = results[i].selectSingleNode('./q1:fullname').nodeTypedValue;
     msg += idValue +"\t"+ name+"\r";
    }
    alert(msg);
 }
}