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

addLoadEvent(collapseMenu);
addLoadEvent(prepareMenu);
addLoadEvent(expandMenu);

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

	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);
		}		
	}
	
	var list = document.getElementById("subnav").getElementsByTagName("LI");
	for (var i=0; i<list.length; i++) {
		var parent = list[i].getElementsByTagName("UL");
		if(parent.length == 0) {
			list[i].setAttribute("class", "nochild");
		}
	}

}


function prepareMenu() {
	if (!document.getElementById || !document.getElementsByTagName) return false;
	if (!document.getElementById("subnav")) return false;

	var links = document.getElementById("subnav").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 expandMenu(node) {
	if (!document.getElementById) return false;
	if (!document.getElementById("subnav_on")) return false;
	if (!node) node = document.getElementById("subnav_on");

	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 = "";
			}
			collapseMenu(child);
		}		
	}

}

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

	// Collapse all nodes, and only show clicked node (when clicking top level of menu)
	if (node) {
		if (node.parentNode.parentNode.id == "subnav") {
			hideTopLevels();
		}  	

	
		if (node.style.display == "") {
			node.style.display = "none"
		} else {
			node.style.display = ""
		}
	}
}

function hideTopLevels() {
	if (!document.getElementById) return false;
	if (!(node = document.getElementById("subnav"))) 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";
					}
				}
			}
		}		
	}
}