var compatible = (document.getElementsByTagName && document.createElement);

if (compatible)
	document.write('<link rel="stylesheet" type="text/css" href="assets/menu.css" />')

function initNavigation() {
	var lists = document.getElementsByTagName('ul');
	for (var i=0;i<lists.length;i++) {
		if (lists[i].className != 'menutree') continue;
		lists[i].onmouseover = navMouseOver;
		lists[i].onmouseout = navMouseOut;
		var listItems = lists[i].getElementsByTagName('li');
		for (var j=0;j<listItems.length;j++) {
			var test = listItems[j].getElementsByTagName('ul')[0];
			if (test) {
				listItems[j].firstChild.onfocus = navMouseOver;
				listItems[j].relatedItem = test;
			}
		}
	}
}

var currentlyOpenedMenus = new Array();
var currentlyFocusedItem;

function navMouseOver(e) {
	var evt = e || window.event;
	var evtTarget = evt.target || evt.srcElement;
	if (evtTarget.nodeName == 'UL') return;
	while (evtTarget.nodeName != 'LI')
		evtTarget = evtTarget.parentNode;
	foldMenuIn(evtTarget);
	if (evtTarget.relatedItem && !evtTarget.relatedItem.opened) {
		evtTarget.className = 'highlight';
		evtTarget.relatedItem.className = 'foldOut';
		evtTarget.relatedItem.opened = true;
		currentlyOpenedMenus.push(evtTarget.relatedItem);
	}
}

function navMouseOut(e) {
	var evt = e || window.event;
	var relatedNode = evt.relatedTarget || evt.toElement;
	foldMenuIn(relatedNode);
}

function foldMenuIn(targetNode) {
	if (!targetNode) return;
	var newCurrentlyOpenedMenus = new Array();
	for (var i=0;i<currentlyOpenedMenus.length;i++) {
		if (!containsElement(currentlyOpenedMenus[i],targetNode)) {
			currentlyOpenedMenus[i].className = '';
			currentlyOpenedMenus[i].parentNode.className = '';
			currentlyOpenedMenus[i].opened = false;
		}
		else
			newCurrentlyOpenedMenus.push(currentlyOpenedMenus[i]);
	}
	currentlyOpenedMenus = newCurrentlyOpenedMenus;
}

function containsElement(obj1,obj2) {
	while (obj2.nodeName != 'HTML') {
		if (obj2 == obj1) return true;
		obj2 = obj2.parentNode;
	}
	return false;
}

addEventSimple(window,"load",initNavigation);
addEventSimple(window,"load",yadm);

function addEventSimple(obj,evt,fn) {
	if (obj.addEventListener)
		obj.addEventListener(evt,fn,false);
	else if (obj.attachEvent)
		obj.attachEvent('on'+evt,fn);
}

function removeEventSimple(obj,evt,fn) {
	if (obj.removeEventListener)
		obj.removeEventListener(evt,fn,false);
	else if (obj.detachEvent)
		obj.detachEvent('on'+evt,fn);
}

/** PUSH AND SHIFT FOR IE5 **/

function Array_push() {
	var A_p = 0
	for (A_p = 0; A_p < arguments.length; A_p++) {
		this[this.length] = arguments[A_p]
	}
	return this.length
}

if (typeof Array.prototype.push == "undefined") {
	Array.prototype.push = Array_push
}

function Array_shift() {
	var A_s = 0
	var response = this[0]
	for (A_s = 0; A_s < this.length-1; A_s++) {
		this[A_s] = this[A_s + 1]
	}
	this.length--
	return response
}

if (typeof Array.prototype.shift == "undefined") {
	Array.prototype.shift = Array_shift
}

/* side vertical menu js */

function yadm()
{

// Variables, change these in case you need to set other class names (mmhide_ for 
// contribute users for example)
	var parentClass='isParent';				//gets applied when the LI has a nested UL
	var activeParentClass='isActive';		//gets applied when the nested UL is visible
	var preventHoverClass='manual';		//denotes a navigation that should not get any hover effects
	var indicateJSClass='dhtml';			//gets applied to the main navigation when Javascript is available
	var toHideClass='hiddenChild';			//gets applied to hide the nested UL
	var toShowClass='shownChild';			//gets applied to show the nested UL
	var currentClass='current';				//denotes the current active sub element and prevents collapsing
	var d=document.getElementById('sidenav');	//denotes the navigation element 

	if(!document.getElementById && !document.createTextNode){return;}

// if the navigation element is available, apply the class denoting DHTML capabilities
	if(d)
	{
		d.className+=d.className==''?indicateJSClass:' '+indicateJSClass;
		var lis,i,firstUL,j,apply;

// loop through all LIs and check which ones have a nested UL
		lis=d.getElementsByTagName('li');
		for(i=0;i<lis.length;i++)
		{
			firstUL=lis[i].getElementsByTagName('ul')[0]
// if there is a nested UL, deactivate the first nested link and apply the class to show 
// there is a nested list
			if(firstUL)
			{
				lis[i].childNodes[0].onclick=function(){return false;}
				lis[i].className+=lis[i].className==''?parentClass:' '+parentClass;
// check if there is a "current" element 
				apply=true;
				if(new RegExp('\\b'+currentClass+'\\b').test(lis[i].className)){apply=false;}
				if(apply)
				{
					for(j=0;j<firstUL.getElementsByTagName('li').length;j++)
					{
						if(new RegExp('\\b'+currentClass+'\\b').test(firstUL.getElementsByTagName('li')[j].className)){apply=false;break}
					}
				}
// if there is no current element, apply the class to hide the nested list
				if(apply)
				{
					firstUL.className+=firstUL.className==''?toHideClass:' '+toHideClass;
// check if there is a class to prevent hover effects and only apply the function
// onclick if that is the case, otherwise apply it onclick and onhover
					if(new RegExp('\\b'+preventHoverClass+'\\b').test(d.className))
					{
						lis[i].onclick=function(){doyadm(this);}
					} else {
						lis[i].onclick=function(){doyadm(this);}
						lis[i].onmouseover=function(){doyadm(this);}
						lis[i].onmouseout=function(){doyadm(null);}
					}
// if there is a current element, define the list as being kept open and apply the 
// classes to show the nested list and define the parent LI as an active one
				} else {
					lis[i].keepopen=1;
					firstUL.className+=firstUL.className==''?toShowClass:' '+toShowClass;
					lis[i].className=lis[i].className.replace(parentClass,activeParentClass);
				}
			}
		}
	}
// function to show and hide the nested lists and add the classes to the parent LIs
	function doyadm(o)
	{
		var childUL,isobj,swap;

// loop through all LIs of the navigation		
		lis=d.getElementsByTagName('li');
		for(i=0;i<lis.length;i++)
		{
			isobj=lis[i]==o;
// function to exchange class names in an object
			swap=function(tmpobj,tmporg,tmprep)
			{
				tmpobj.className=tmpobj.className.replace(tmporg,tmprep)		
			}
// if the current LI does not have an indicator to be kept visible
			if(!lis[i].keepopen)
			{
				childUL=lis[i].getElementsByTagName('ul')[0];
// check if there is a nested UL and if the current LI is not the one clicked on
// and exchange the classes accordingly (ie. hide all other nested lists and 
// make the LIs parent rather than active.
				if(childUL)	
				{	
					if(new RegExp('\\b'+preventHoverClass+'\\b').test(d.className))
					{
						if(new RegExp('\\b'+activeParentClass+'\\b').test(lis[i].className))
						{
							swap(childUL,isobj?toShowClass:toHideClass,isobj?toHideClass:toShowClass);		
							swap(lis[i],isobj?activeParentClass:parentClass,isobj?parentClass:activeParentClass);		
						} else {
	
							swap(childUL,isobj?toHideClass:toShowClass,isobj?toShowClass:toHideClass);		
							swap(lis[i],isobj?parentClass:activeParentClass,isobj?activeParentClass:parentClass);		
						}
					} else {
							swap(childUL,isobj?toHideClass:toShowClass,isobj?toShowClass:toHideClass);		
							swap(lis[i],isobj?parentClass:activeParentClass,isobj?activeParentClass:parentClass);		
					}
				} 
			}
		}
	}
}