function toggle_ul(anchor)
{
	var li_object = anchor.parentNode;
	
	var nodes = li_object.getElementsByTagName('ul');
	
	for (var i = 0; i < nodes.length; i++)
	{
		if (nodes[i].className == 'collapsed')
		{
			nodes[i].className = 'expanded';
			anchor.className = 'opened';
		}
		else
		{
			nodes[i].className = 'collapsed';
			anchor.className = 'closed';
		}
		// first is enough .. break loop
		break;
	}	
}

function expand_first_ul(node)
{
	var nodes = node.getElementsByTagName('ul');
	for (var i = 0; i < nodes.length; i++)
	{
		nodes[i].className = 'expanded';
		return;
	}
}

function show_menu_node(rubriekid, pageid)
{
	var rubriek_anchor = document.getElementById('menunode_'+rubriekid);
	
	if (rubriek_anchor != null)
	{
		rubriek_anchor.className="active";
		var rubriek_li = rubriek_anchor.parentNode;
		expand_first_ul(rubriek_li);
		
		var superrubriek_ul = rubriek_li.parentNode;
		superrubriek_ul.className = "expanded";

		var superrubriek_li = superrubriek_ul.parentNode;
		if (superrubriek_li != null)
		{
			var superrubriek_ul2 = superrubriek_li.parentNode;
			superrubriek_ul2.className = "expanded";
		}
	}
}

function init()
{
	//make sure we only get here once
	if (arguments.callee.done)
	{
		return;
	}
	arguments.callee.done = true;

	var menu = document.getElementById('navtree');
	collapse_all(menu);
	build_treecontrols(menu);		
}

function collapse_all(menu)
{
	var items = menu.getElementsByTagName('UL');
	
	for (var n = 0; n < items.length; n++)
	{
		items[n].className = 'collapsed';
	}
}

function build_treecontrols(menu) 
{
	
	var items = menu.getElementsByTagName('LI');
	for (var n = 0; n < items.length; n++)
	{
		var a = items[n].getElementsByTagName('A');
		var ul = items[n].getElementsByTagName('UL');
		
		a[0].onclick = function() { toggle_ul(this); };
		
		if (ul.length > 0)
		{
			a[0].className = 'closed';
		}
	}
	
}

// 	trigger onload when DOM is ready. for IE see ie_onload.js and the conditional 
//	comment in main.jsp

//	(moz browsers)
if (document.addEventListener) 
{
    document.addEventListener("DOMContentLoaded", init, null);
}