function getAjaxObject() {
 	var req = null;
      try {
        if( window.XMLHttpRequest ) {
          req = new XMLHttpRequest();
        } else if( window.ActiveXObject ) {
          req = new ActiveXObject( "Microsoft.XMLHTTP" );
        } else {
          alert( "Ihr Webbrowser unterstuetzt leider kein Ajax!" );
        }
        return req;
      } catch (e) {
      	alert(e);
      }
    }