function ajax(x,t)
{
  var xmlhttp = newxmlhttp();
  xmlhttp.open("GET",'ajax.php'+x+'&PHPSESSID=nr9e3l6k8fpjnngqbg0kl9qt5o',true);
  xmlhttp.onreadystatechange = function()
  {
    if (this.readyState == 4 && this.status == 200)
    {
      var e = document.getElementById('tartalom');
      e.innerHTML = this.responseText;
      frissit(x,t);
    }
  }
  xmlhttp.send(null);
}

function frissit(x,t)
{
  setTimeout(function(){ajax(x,t);},t*1000);
}

function newxmlhttp()
{
  if (window.XMLHttpRequest) xmlhttp = new XMLHttpRequest();
  else if (window.ActiveXObject) xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
  return xmlhttp;
}