//var event_request;

function initAJAX() {

  var request;

  // Opera 8.0+, Firefox, Safari  
  try {
    request = new XMLHttpRequest();
  } catch (e) {
    // Internet Explorer Browsers
    try {
      request = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        request = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (e){
        // Something went wrong
        alert("Your browser broke!");
      }
    }
  }
  
  return request;
  
}

function executeAJAX(request, script, params) {
  request.open("GET", script + params, true);
  request.send(null);
}