Edit in JSFiddle

var xml = '<?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> ' +
     '<GetQuote xmlns="http://www.webserviceX.NET/"> ' +
       '<symbol>' + symbol + '</symbol> ' +
     '</GetQuote> ' +
   '</soap:Body> ' +
 '</soap:Envelope>';


parser = new DOMParser();
xmlDoc = parser.parseFromString(xml, "text/xml");

var json = XMLObjectifier.xmlToJSON(xmlDoc);

document.getElementById("result").innerHTML = json.Body[0].GetQuote[0].symbol[0].Text;

<h1>Result:</h1>

<div id="result">
    
</div>