var req;
function retrieveURL(url) {
   if (window.XMLHttpRequest) { // Non-IE browsers
      req = new XMLHttpRequest();
      req.onreadystatechange = processStateChange;
      try {
         req.open("GET", url, true);
      } catch (e) {
         //alert(e);
      }
      req.send(null);
   } else if (window.ActiveXObject) { // IE
      req = new ActiveXObject("Microsoft.XMLHTTP");
      if (req) {
         req.onreadystatechange = processStateChange;
         req.open("GET", url, true);
         req.send();
      }
   }
}

function processStateChange() {
   if (req.readyState == 4) { // Complete
      if (req.status == 200) { // OK response
         document.getElementById("troll").innerHTML = req.responseText;
      } else {
         //alert("Problem: " + req.statusText);
      }
   }
}
//retrieveURL('getimg.php');
//window.setInterval('retrieveURL("getimg.php")', 60000);
window.setTimeout('retrieveURL("getimg.php")', 1000);