function updatePage() {
   if (request.readyState == 4) {
     if (request.status == 200) {
       var response = request.responseText;
       document.getElementById("forum").innerHTML =
         response;
     } else
       alert("status is " + request.status);
   }
 }



function forum() {
  try {
    request = new XMLHttpRequest();
  } catch (trymicrosoft) {
    try {
      request = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (othermicrosoft) {
      try {
        request = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (failed) {
        request = false;
      }
    }
  }

  if (!request)
    alert("Error initializing XMLHttpRequest!");
	
  var url = "http://sanitarim.ru/forum/moskit.php";
     request.open("GET", url, true);
     request.onreadystatechange = updatePage;
     request.send(null);
}