xml = Class.create();
xml.prototype = {
    initialize: function(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");
        }
        this.doc = doc;
    },
    getDocumentElement:function() {
        return this.doc.documentElement;
    }
};