function load() {
    url = "randomsite4.php"
    if (window.XMLHttpRequest) { 
      req = new XMLHttpRequest();
      req.onreadystatechange = targetDiv;
      try {
        req.open("GET", url, true);
      } catch (e) {
        alert(e);
      }
      req.send(null);
    } else if (window.ActiveXObject) {
      req = new ActiveXObject("Microsoft.XMLHTTP");
      if (req) {
        req.onreadystatechange = targetDiv;
        req.open("GET", url, true);
        req.send();
      }
    }
}

function targetDiv() {
    if (req.readyState == 4) { 
          if (req.status == 200) { 
              document.getElementById("site").innerHTML = req.responseText;
          } else {
            alert("Problem: " + req.statusText);
          }
     var objDiv = document.getElementById("site");
     objDiv.scrollTop = objDiv.scrollHeight;
    }
}
	setInterval('load()', 5000);