a cross-broswer solution for serialize xml dom

function serializeXml(xmldom) {

        if (typeof XMLSerializer != "undefined") {
            return (new XMLSerializer()).serializeToString(xmldom);
        } else if (document.implementation.hasFeature("LS", "3.0")) {
            var implementation = document.implementation;
            var serializer = implementation.createLSSerializer();
            return serializer.writeToString(xmldom);
        } else if (typeof xmldom.xml != "undefined") {
            return xmldom.xml;
        } else {
        throw new Error("Could not serialize XML DOM");
        }
    }