var w = window;
      function openWin(url) {
         if ((w == window) || w.closed) {
            w = open(url, "_blank", "toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=no,width=1000,height=800");
         } else {
            w.focus();
         }
         return(false);
      }