function showRssUrl(classcode){
 
     var win = null;
     win = window.open('', 'popupnav', 'height=100, width=500,scrollbars=yes,   status=no' );
     if (win != null) {
       if (win.opener == null)
          win.opener = self;
          win.location.href = '../rss/showRssUrl.jsp?classcode='+classcode;
       }
}