var popup = null;
 function popupwindow(URL) {
  popup = window.open('', 'src_remote','width=550,height=550,toolbar=no,menubar=no,status=no,resizable=1,scrollbars=yes');
  if (popup != null) {
    if (popup.opener == null) {
        popup.opener = self;
          self.location.href=document.location;
    }
    popup.location.href = URL
  }
}