var page = "news.php";
function news(url,target)
 {
    // native XMLHttpRequest object
   document.getElementById(target).innerHTML = '<br><br><center><img src="js/ajax-loader.gif"></center>';

   if (window.XMLHttpRequest) {
       req = new XMLHttpRequest();
       req.onreadystatechange = function() {ajaxDone(target);};
       req.open("GET", url+"?los="+Math.random(), true);
       req.send(null);
   // IE/Windows ActiveX version
   } else if (window.ActiveXObject) {
       req = new ActiveXObject("Microsoft.XMLHTTP");
       if (req) {
           req.onreadystatechange = function() {ajaxDone(target);};
           req.open("GET", url+"?los="+Math.random(), true);
           req.send();
       }
   }
		   setTimeout("news(page,'artykul')", 20000);
}

function ajaxDone(target) {
// only if req is "loaded"
if (req.readyState == 4) {
// only if "OK"
if (req.status == 200 || req.status == 304) {
results = req.responseText;
document.getElementById(target).innerHTML = results;
} else {
document.getElementById(target).innerHTML="";
}
}
}