/*
 * Dynamic Menu
 * Written by Andy Peatling - http://www.cssdev.com/
 * April 1, 2006.
 */

addLoadEvent(collapseMenu);
addLoadEvent(prepareMenu);

function collapseMenu(node) {

	if (!document.getElementById) return false;
	if (!document.getElementById("submenu")) return false;
	if (!node) node = document.getElementById("submenu");

	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("submenu")) return false;	
	
	var links = document.getElementById("submenu").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 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.style.display == "") {
		Effect.Fade(node, {duration: 0.2});		
	} else {
		Effect.Appear(node, {duration: 0.2});
		hideTopLevels();
	}
}

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