// menu
function click_tree_menu(obj,bgcoll)
{
 if (obj && obj.parentNode && obj.parentNode.parentNode)
  {
	var curObj = obj.parentNode.parentNode.nextSibling;
	if (! curObj || curObj.className != "child") return;
	var vis = "none";
	if (obj.id) document.cookie = obj.id + "=0;"
	if (curObj.style.display == "none")
	 {
	   vis = "";
	   if (obj.id) document.cookie = obj.id + "=1;";
	   obj.parentNode.style.backgroundColor = bgcoll;
	 } 
	else 
	 {
	   obj.parentNode.style.backgroundColor = "";
	 } 

	while (curObj.className == "child")
	 {
	   curObj.style.display = vis;
	   curObj = curObj.nextSibling;
	 }
  }
}