function getSubList (li) {
 var subList = null;
 for (var c = 0; c < li.childNodes.length; c++)
  if (li.childNodes[c].nodeName == 'UL') {subList = li.childNodes[c]; break;}
  return subList;
}
function onClickHandler (evt) {
 var target = evt ? evt.target : event.srcElement;
 if (target.className == 'expandable') { //
  if (target.expanded) {
   target.style.listStyleImage = 'url(/Proteus5/img/plus_large.gif)';
   getSubList(target).style.display = 'none';
   target.expanded = false;
  } else {
    target.style.listStyleImage = 'url(/Proteus5/img/min_large.gif)';
    getSubList(target).style.display = 'block';
    target.expanded = true;
  }
 }
 return true;
}
document.onclick = onClickHandler;