function XMLHttp_request()
  {
          this.isIE               = false;
          this.allow_use          = false;
          this.xmlhandler         = null;
          this.error_string       = null;
          this.nocache            = true;
          this.do_request_functon = function() {}
          this.loading_fired      = 0;
          this.centerdiv          = null;
  }

  XMLHttp_request.prototype.xml_init = function()
  {
          try
          {
                  this.xmlhandler = new XMLHttpRequest();
                  this.ie        = false;
                  this.allow_use = true;
                  return true;
          }
          catch(e)
          {
                  try
                  {
                        this.xmlhandler = new ActiveXObject('Microsoft.XMLHTTP');
                          this.ie        = true;
                          this.allow_use = true;
	       return true;
                  }
                  catch(e)
                  {
                          this.ie = true;
                          this.allow_use = false;
                          return false;
                  }
          }
  }

  XMLHttp_request.prototype.process = function( url, type, post )
  {
          type = type == "POST" ? "POST" : "GET";
          if ( this.nocache == true  && type == 'GET' )
          {
                  url = this.nocache_url( url );
          }
          if ( ! this.xmlhandler )
          {
                  this.xml_init();
          }

          if ( ! this.readystate_not_ready() )
          {
                  this.xmlhandler.open(type, url, true);
                  if ( type == "GET" )
                  {
                          this.xmlhandler.send(null);
                  }
                  else
                  {
                          if ( typeof( this.xmlhandler.setRequestHeader ) != "undefined" )
                          {
                                  this.xmlhandler.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
                          }
                          this.xmlhandler.send( post );
                  }

                  if ( this.xmlhandler.readyState == 4 && this.xmlhandler.status == 200 )
                  {
                          return true;
                  }
          }
          return false;
  }

  XMLHttp_request.prototype.get_element_text_ns = function(prefix, local, parentElem, index)
  {
          var result = null;
          if ( prefix && this.isIE )
          {
                  result = parentElem.getElementsByTagName(prefix + ":" + local)[index];
          }
          else
          {
                  result = parentElem.getElementsByTagName(local)[index];
          }

          if ( result )
          {
                  if (result.childNodes.length > 1)
                  {
                          return result.childNodes[1].nodeValue;
                  }
                  else
                  {
                          return result.firstChild.nodeValue;
                  }
          }
          else
          {
                  return "n/a";
          }
  }

  XMLHttp_request.prototype.nocache_url = function (url)
  {
          var sep    = ( -1 < url.indexOf("?") ) ? "&" : "?";
          var mydate = new Date();
          var newurl = url + sep + "__=" + mydate.getTime();
          return newurl;
  }
  XMLHttp_request.prototype.format_for_post = function( arrayfields )
  {
          var str = '';
          try
          {
                  for( var i in arrayfields )
                  {
                          str += i + '=' + this.encodeurl(arrayfields[i]) + '&';
                  }
          }
          catch(e)
          {

          }

          return str;
  }

  XMLHttp_request.prototype.encodeurl = function( url )
  {
          url = url.toString();
          var regcheck = url.match(/[\x90-\xFF]/g);
          if ( regcheck )
          {
                  for (var i = 0; i < i.length; i++)
                  {
                         url = url.replace(regcheck[i], '%u00' + (regcheck[i].charCodeAt(0) & 0xFF).toString(16).toUpperCase());
                  }
          }
          return escape(url).replace(/\+/g, "%2B");
  }
  XMLHttp_request.prototype.readystate_not_ready = function()
  {
          return ( this.xmlhandler.readyState && ( this.xmlhandler.readyState < 4 ) );
  }
  XMLHttp_request.prototype.readystate_ready_and_ok = function()
  {
          return ( this.xmlhandler.readyState == 4 && this.xmlhandler.status == 200 ) ? true : false;
  }
  XMLHttp_request.prototype.onreadystatechange = function( event )
  {
          if ( ! this.xmlhandler )
          {
                  this.xml_init();
          }
          if ( typeof(event) == 'function' )
          {
                  this.xmlhandler.onreadystatechange = event;
          }
  }