function setDisplay(objectID, state) {
  var object = document.getElementById(objectID);
  object.style.display = state;
 }

 function toggleDisplay(objectID) {
  var object = document.getElementById(objectID);
  state = object.style.display;
  if (state == 'none')
   object.style.display = 'block';
  else if (state != 'none')
   object.style.display = 'none';
 }