var XmlHttp = zXmlHttp.createRequest();
      //alert(XmlHttp);
      //var XmlHttp = new XMLHttpRequest();
      XmlHttp.open("get", "test.txt", true);
      XmlHttp.onreadystatechange = function() {
      if(XmlHttp.readystate == 4)
      alert("Otrzymano wynik z serwera!" + XmlHttp.responseText);
      }
      XmlHttp.send(null);
      if(XmlHttp.status == 200){
      alert("OK!");
      } else {
      alert("Błąd: "+ XMLHttp.statusText);
      }

var XmlHttp = new XMLHttpRequest();

  function XmlHttp(url) {
    try {

      req = new XMLHttpRequest(); /* FIX dla Firefox; Opera */

    } catch(e) {

      try {

      req = new ActiveXObject("Msxml2.XMLHTTP");

    /* FIX dla IE 5.5-*/

      } catch (e) {

        try {

        req = new ActiveXObject("Microsoft.XMLHTTP");

  /* FIX dla IE6+ */

        } catch (E) {

          req = false;

        }

      }

    }
req.onreadystatechange = function() {  if(req.readyState == 4)
{
  if(req.status == 200) {alert("OK: " + req.responseText);}
   else {alert("ERROR: " + req.responseText);}};}
req.open("GET",url,true);
req.send(null);
}
XmlHttp('test.txt');