var request1 = null;
function createRequest1() {
  try {
    request1=new XMLHttpRequest();
  } catch (trymicrosoft) {
    try {
      request1=new ActiveXObject("Msxml2.XMLHTTP");
    } catch (othermicrosoft) {
      try {
        request1=new ActiveXObject("Microsoft.XMLHTTP");
      } catch (failed) {
        request1 = null;
      }
    }
  }
  if (request1 == null)
    alert();
}