// <![CDATA[
var XMLHTTP = null;

if (window.XMLHttpRequest) {
  XMLHTTP = new XMLHttpRequest();
} else if (window.ActiveXObject) {
  try {
    XMLHTTP = 
      new ActiveXObject("Msxml2.XMLHTTP");
  } catch (ex) {
    try {
      XMLHTTP = 
       new ActiveXObject("Microsoft.XMLHTTP");
    } catch (ex) {
    }
  }
}

function DatenAusgeben() {
if (document.getElementById('Daten')!=null)  {
  if (XMLHTTP.readyState == 4) {
  document.getElementById('Daten').innerHTML = '';
    var d = document.getElementById("Daten");
    d.innerHTML += XMLHTTP.responseText;
  }
 }
}

window.setInterval("getText()", 15000);

getText();

function getText() {
  XMLHTTP.open("POST", "/tools/user_online.php");
  XMLHTTP.onreadystatechange = DatenAusgeben;
  XMLHTTP.setRequestHeader("Content-Type", 
    "application/x-www-form-urlencoded");
  XMLHTTP.send("a=AJAX");
}

// ]]>