function toggle(caller)
{
 if(caller.alt == 'opened')
 {
  caller.src = 'closed.dir';
  caller.alt = 'closed';
  images = caller.parentNode.getElementsByTagName('img');
  for(i = 0; i < images.length; i++)
  {
   if(images[i].alt == 'opened')
   {
    images[i].src = 'closed.dir';
    images[i].alt = 'closed';
   }
  }
  lists = caller.parentNode.getElementsByTagName('ul');
  for(i = 0; i < lists.length; i++)
  {
    lists[i].style.display = 'none';
  }
  
 }
 else if(caller.alt == 'closed')
 {
  caller.src = 'opened.dir';
  caller.alt = 'opened';
  children = caller.parentNode.childNodes;
  for(i = 0; i < children.length; i++)
  {
   if(children[i].nodeName == 'UL')
   {
    children[i].style.display = '';
   }  
  }
 }
}
 
function closeTree()
{
 /* this closes the menu tree when the page loads */
 lists = document.getElementById('Menu').getElementsByTagName('ul');
 images = document.getElementById('Menu').getElementsByTagName('img');
 for(i = 0; i < images.length; i++)
 {
  if(images[i].alt == 'opened')
  {
   images[i].src = 'closed.dir';
   images[i].alt = 'closed';
  }
 }
 for(i = 1; i < lists.length; i++)
 {
  lists[i].style.display = 'none';
 }
}
closeTree();