addLoadEvent(collapseMenu);
addLoadEvent(prepareMenu);

function collapseMenu(node) {
 if (!document.getElementById) return false;
 if (!document.getElementById("menu")) return false;
 if (!node) node = document.getElementById("menu");
 if (!node) node = document.getElementById("currentpage");
 
 if (node.childNodes.length > 0) {
  for (var i=0; i<node.childNodes.length; i++) {
   var child = node.childNodes[i];
   if (child.nodeName == "UL") {
    child.style.display = "none";
   }
   collapseMenu(child);
  }		
 }
}

function prepareMenu() {
 if (!document.getElementById || !document.getElementsByTagName) return false;
 if (!document.getElementById("menu")) return false;
// if (!menu.getElementsByTagName("a")) return false;
 
var links = document.getElementById("menu").getElementsByTagName("a");
 for (var i=0; i<links.length; i++) {	
  links[i].onclick = function() {
   toggleMenu(this.parentNode.getElementsByTagName("UL")[0], this.href);
   return false;
  }
 }
}

function toggleMenu(node, link) {
 if (!document.getElementById) return false;
 if (!link) return false;
 if (!node) location.href = link.href;
 if (node.parentNode.parentNode.id == "menu") {
 hideTopLevels();
}
 
 if (node.style.display == "") {
  node.style.display = "none";
 } else {
  node.style.display = "";
 }
}

function hideTopLevels() {
 if (!document.getElementById) return false;
 if (!(node = document.getElementById("menu"))) return false;
 
 if (node.childNodes.length > 0) {
  for (var i=0; i<node.childNodes.length; i++) {
   var child = node.childNodes[i];
   for(var j=0; j<child.childNodes.length; j++) {
    var grandchild = child.childNodes[j];
    if (grandchild.nodeName == "UL") {
     if (grandchild.style.display == '') {
      grandchild.style.display = "none";
     }
    }
   }
  }		
 }
}