a cross-broswer solution for parse xml fragment

function parseXml(xml) {
        var xmldom = null;

        if (typeof DOMParser != "undefined") {
            xmldom = (new DOMParser()).parseFromString(xml, "text/xml");
            var errors = xmldom.getElementByTagName("parsererror");
            if (errors.length) {
                throw new Error("XML parsing error:" + errors[0].textContent);
            }
        } else if (document.implementation.hasFeature("LS", "3.0")) {
            var implementation = document.implementation;
            var parser = implementation.createLSParser(implementation.MODE_SYNCHRONOUS, null);
            var input = implementation.createLSInput();
            input.stringDate = xml;
            xmldom = parser.parse(input);
        } else if (typeof ActiveXObject != "undefined") {
            xmldom = createDocument();
            xmldom = loadXML(xml);
            if (xmldom.parseError != 0) {
                throw new Error("XML parsing error:" + xmldom.parseError.reason);
            }
        } else {
        throw new Error("NO XML parser available.");
    }
    return xmldom;
    }