function openclose(n) {
  if (document.getElementsByTagName('ul')[n].style.display == 'block') {
    document.getElementsByTagName('ul')[n].style.display = 'none';
    document.getElementById(n).firstChild.nodeValue = '©';
    document.getElementById(n).style.color = '#787878';
  } else {
    document.getElementsByTagName('ul')[n].style.display = 'block';
    document.getElementById(n).firstChild.nodeValue = '®';
    document.getElementById(n).style.color = '#660000';
  }
}