function showMenu(name) {
  var menu = document.getElementById(name);
  if (menu) {
    menu.style.display = "block";
  }
  var menu_title = document.getElementById(name + '_title');
  if (menu_title) {
    menu_title.style.backgroundColor = "#4b469a";
  }
}

function hideMenu(name) {
  var menu = document.getElementById(name);
  if (menu) {
    menu.style.display = "none";
  }
  var menu_title = document.getElementById(name + '_title');
  if (menu_title) {
    menu_title.style.backgroundColor = "black";
  }
}