var request=null;
var result_box="";

function createrequest() {
// we first try to use ActiveX, because IE7 has a direct support for XmlHttpRequest object, 
// but which doesn't work with file urls

 if(window.ActiveXObject) {
  try { request = new ActiveXObject("Msxml2.XMLHTTP");
  } catch(e) {
   try { request = new ActiveXObject("Microsoft.XMLHTTP");
   } catch(e) { request = false; }
  }
 }else if(window.XMLHttpRequest) {
  try { request = new XMLHttpRequest();
  } catch(e) { request = false; }
 }else{
 }
 return request; 
}