// JavaScript functions to show and hide drop-down menus.

function showItem (itemID) {
  var elem = document.getElementById(itemID);
  if (elem) {
	  elem.style.visibility = "visible";
  }
  return true;
}

function hideItem (itemID) { 
  var elem = document.getElementById(itemID);
  if (elem) {
	  elem.style.visibility = "hidden";
  }
  return true;
}