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

if (request == null)
  alert("Error creating request object!");

/* CROSS-BROWSER EVENT HANDLER */
		function addEvent(obj, evType, fn){
			 if (obj.addEventListener){
				 obj.addEventListener(evType, fn, true);
				 return true;
			 } else if (obj.attachEvent){
				 var r = obj.attachEvent("on"+evType, fn);
				return r;
			 } else {
				return false;
			 }
		}
/* END EVENT HANDLER */