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function Ajax() {
  if (typeof (Ajax.initMethod) == "undefined") {
  Ajax.prototype.GetHttpRequestObject = function() {
  if (window.ActiveXObject) return new ActiveXObject("Microsoft.XMLHTTP");
  else if (window.XMLHttpRequest) return new XMLHttpRequest();
  try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { };
  return null;
  }

  Ajax.prototype.EncodeUrlParam = function(param){
  var params = param.split('&');
  var rp = "";
  for(var i = 0;i< params.length;i++){
  var nv = params[i].split('=');
  if(rp != "") rp += "&";
  rp += nv[0] + "=";
  rp += encodeURIComponent(nv[1]);
  }
  return rp;
  }
  // callback is defined outside with two params
  // first param shows that the request complete successfully or not
  // second shows the response text
  Ajax.prototype.Get = function(url, callback) {
  var xmlHttp = Ajax.prototype.GetHttpRequestObject();
  if (xmlHttp == null) {