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!");



function addEmailToList() {
   // setup ajax add email to list php routine
      var em = document.getElementById("emNew").value;
      var url = 'addEmail.php?em=' + em;
          request.open("GET", url, true);
          request.onreadystatechange = function () {
           if (request.readyState == 4) {
             if (request.status == 200) { 
                 var aMsg = request.responseText;
                 try {
                        document.getElementById("emMsg").innerHTML=aMsg;
                 } catch(e) { }
              }
            }
          }
          request.send(null);
}