function getXMLHttpRequest() {                var xhr;                if(window.ActiveXObject) {                         xhr= new ActiveXObject("Microsoft.XMLHTTP");                }else if (window.XMLHttpRequest) {                         xhr= new XMLHttpRequest();                }else {                         xhr= null;                }                return xhr;      }            function save() {                var xhr = getXMLHttpRequest();                xhr.open("post","url");                var data = "name=mikan&address=street...";                xhr.send(data);                xhr.onreadystatechange= function() {                         if(xhr.readyState == 4 && xhr.status == 200) {                                  alert("returned:"+ xhr.responseText);                         }                };      }