function sh(){
  if (document.getElementById("langmenu")){
    document.getElementById("langmenu").style.visibility = 'visible';
    document.getElementById("langmenuunder").style.visibility = 'visible';
    document.getElementById("langmenu").style.display = 'block';
    document.getElementById("langmenuunder").style.display = 'block';
  }
}

function hide(){
  if (document.getElementById("langmenu")){
    document.getElementById("langmenu").style.visibility = 'hidden';
    document.getElementById("langmenuunder").style.visibility = 'hidden';
    document.getElementById("langmenu").style.display = 'none';
    document.getElementById("langmenuunder").style.display = 'none';
  }
}