var oTarget = document;
//addLoadEvent(collapseMenu);
//addLoadEvent(prepareMenu);

function openSidemenu() {

	if (navigation_tree.match(",")) {
		tree = navigation_tree.split(",");
		for (i = 1; i < tree.length; i++) {
			try {
				document.getElementById("navigatie_zijkant_" + tree[i] + "_children").style.display = "block";
			} catch (ex) {
			}
		}
	} else {
		document.getElementById("navigatie_zijkant_" + navigation_tree + "_children").style.display = "block";
	}
	prepareMenu();
}

function collapseMenu(node) {
	if (!document.getElementById) return false;
	if (!document.getElementById("navigatie_zijkant")) return false;
	if (!node) node = document.getElementById("navigatie_zijkant");

	if (node.childNodes.length > 0) {
		for (var i=0; i<node.childNodes.length; i++) {
			var child = node.childNodes[i];
			if (child.nodeName == "UL") {
				if (i!=0) child.style.display = "none"; // **** de if stond er niet
			}
			collapseMenu(child);
		}
	}
}

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

function toggleMenu(node, link) {
	if (!document.getElementById) return false;
	if (!link) return false;
	if (node){
		if (node.parentNode.parentNode.id == "navigatie_zijkant") {
			hideTopLevels();
		}
		if (node.style.display == "block") {
			if (node.innerHTML != "") {
				Effect.BlindUp(node, {duration: 0.5});
			}
		} else {
			if (node.innerHTML != "") {
				Effect.BlindDown(node, {duration: 0.5});
			}
		}
		if (link.href!="#") setTimeout("oTarget.location.href = '" + link.href + "';", 500);
	} else {
		oTarget.location.href = link;
	}
}

function hideTopLevels() {
	if (!document.getElementById) return false;
	if (!(node = document.getElementById("navigatie_zijkant"))) 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 == '') {
						Effect.BlindUp(grandchild, {duration: 0.2});
					}
				}
			}
		}		
	}
}

function retard(href) {
	alert(href);
	return false;	
}

function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') { 
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}