var groupSiteClosed = true;

function switchGroupSiteOn() {
  $('sitigruppo').style.display = 'block';
  $('sitigruppo_back').style.display = 'block';
  groupSiteClosed = false;
}

function switchGroupSiteOff() {
  $('sitigruppo_back').style.display = 'none';
  $('sitigruppo').style.display = 'none';
  groupSiteClosed = true;
}

function switchGroupSite() {
  if (groupSiteClosed) {
      switchGroupSiteOn();
  } else {
      switchGroupSiteOff();
  }
}