Put the response in a Variable

Put the response in a Variable

This is my Request 
      <?xml version="1.0" encoding="utf-8"?>

<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">

  <soap:Body>

    <GetConnectionString xmlns="http://tempuri.org/">

      <strUsername>string</strUsername>

      <strPassword>string</strPassword>

    </GetConnectionString>

  </soap:Body>

</soap:Envelope>

This will be the response Http 

      <?xml version="1.0" encoding="utf-8"?>

<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">

  <soap:Body>

    <GetConnectionStringResponse xmlns="http://tempuri.org/">

      <GetConnectionStringResult>string</GetConnectionStringResult>

    </GetConnectionStringResponse>

  </soap:Body>

</soap:Envelope>
this my codes when Button was clicked
$("#btnLog").click(function() {
     
     jQuery.support.cors = true;
                    
      var soapRequest =
                        '<?xml version="1.0" encoding="utf-8"?> \
                        <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" \
                            xmlns:xsd="http://www.w3.org/2001/XMLSchema" \
                            xmlns:soap="http://www.w3.org/2003/05/soap-envelope"> \
                          <soap:Body> \
                            <Authenticate xmlns="http://tempuri.org/"> \
                              <strUsername>' + $("#uname").val() + '</strUsername> \
                              <strPassword>' + $("#upass").val() + '</strPassword> \
                            </Authenticate> \
                          </soap:Body> \
                        </soap:Envelope>';
                        
                $.ajax({
                    type: "POST",
                    url: "http://xxxxxx-xx/xxxxxx/Service1.asmx?op=GetConnectionString",
                    contentType: "text/xml; charset=\"utf-8",
                    dataType: "xml",
                    data: soapRequest,
                    success: parseRequestResponse,
                    error: processError, 
                });
         function parseRequestResponse(response) {   // when success in connection in ConnectionString
             $.mobile.changePage("#panelview"); -- will load a another page
            alert(response.responseXML); --alert the srting response
            
         }       
   
      function processError() {// when error in connection in ConnectionString
            $('#f4').show("slow"); //Animation effect -- there is a load message when error
        }  
I want to put the response of Web service  in a variable. Can anyone tell me how ?..Thank you