how to convert xsl object to string and viceversa in javascript?

function XMLtoString(elem){

    var serialized;

    try {
        // XMLSerializer exists in current Mozilla browsers
        serializer = new XMLSerializer();
        serialized = serializer.serializeToString(elem);
    }
    catch (e) {
        // Internet Explorer has a different approach to serializing XML
        serialized = elem.xml;
    }

    return serialized;
}
function StringtoXML(text){
    if (window.ActiveXObject){
      var doc=new ActiveXObject('Microsoft.XMLDOM');
      doc.async='false';
      doc.loadXML(text);
    } else {
      var parser=new DOMParser();
      var doc=parser.parseFromString(text,'text/xml');
    }
    return doc;
}