function openHelpWin(help_url, w, h) { 
      if (help_url == "#" || !help_url ) {
        help_url = "https://cbits.nws.noaa.gov/ords/emrsuser/emrs_main.messagewin";
      }
      if (!w) w = 800;
      if (!h) h = 600;
      var helpWin = window.open(help_url,"EMRSHELPWIN","HEIGHT=" + h + ",WIDTH=" + w + ",TOP=5,LEFT=5,resizable=YES,scrollbars=yes");
      helpWin.focus();
      return true;
    }