function menu_on(menuid) {

    document.getElementById(menuid).style.display='block';

  }

  function menu_off(menuid) {

    document.getElementById(menuid).style.display='none';

  }

  function openwindow(url,name,attr) {

    window.open(url,name,"toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, copyhistory=no, "+attr)

  }