var helpwin = null;


function showHelp() {
   helpwin = window.open("helptext.html","help",
       "toolbar=no,location=no,directories=no,status=no,"
     + "menubar=no,scrollbars=yes,resizable=yes,"
     + "width=400,height=200");
   helpwin.focus()
}

function closewin(){
   if (helpwin != null && !helpwin.closed)
     helpwin.close();
}