function hide() {
  var toggleable = document.getElementById('toggleable').getElementsByTagName('div');
  for (var i = 0; i < toggleable.length; i++) {
    toggleable[i].style.display = 'none';
  }
}



function show(id) {
  hide();
  document.getElementById("toggleable").style.display="block"; 
  document.getElementById(id).style.display = 'block';
}