Mine

  function md5(string) {    var xmlHttp;    try {      xmlHttp=new XMLHttpRequest();    }    catch (e) {      try {        xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");      }      catch (e) {        try {          xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");        }        catch (e) {          return false;        }      }    }    xmlHttp.onreadystatechange=function() {      if (xmlHttp.readyState == 4) {        return xmlHttp.responseText;            }    }    var url = "/query.php";    url = url+"?mode=md5";    url = url+"&s="+string;    xmlHttp.open("GET",url,true);    xmlHttp.send(null);    }