/*
 * Dynamic Menu
 * Written by Andy Peatling
 * April 1, 2006.
 */

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.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;

	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;
		}
		        if (links[i].href == window.location) {
            toggleMenu(links[i].parentNode.parentNode, links[i]);
        }
	}
}

function toggleMenu(node, link) {
	if (!document.getElementById) return false;
	if (!link) return false;
	if (!node) location.href = link.href;

	// Collapse all nodes, and only show clicked node (when clicking top level of menu)
	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";
					}
				}
			}
		}		
	}
}
function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}