function makeRequest()
{
  var http_request = false;
  if (window.XMLHttpRequest) { // Mozilla, Safari, ...
     http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {
           http_request.overrideMimeType('text/xml'); // Фиксиране на някои проблеми
        }
  } else if (window.ActiveXObject) { // IE
       try {
          http_request = new ActiveXObject("Msxml2.XMLHTTP");
       } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
       }
  }
  if (!http_request) {
     alert('Възникна проблем с връзката');
     return false;
  }
  return http_request;
}