Array.prototype.indexOf = IndexOf;
var stav = new Array();
var elID;
//Toggles between two classes for an element
function ToggleClass(element, firstClass, secondClass, event)
{
    event.cancelBubble = true;
    
    var classes = element.className.split(" ");
    var firstClassIndex = classes.indexOf(firstClass);
    var secondClassIndex = classes.indexOf(secondClass);
    
    if (firstClassIndex == -1 && secondClassIndex == -1)
    {
        classes[classes.length] = firstClass;
    }
    else if (firstClassIndex != -1)
    {
        classes[firstClassIndex] = secondClass;
    }
    else
    {
        classes[secondClassIndex] = firstClass;
    }
    
    element.className = classes.join(" ");
    
    var tree = document.getElementById(elID);
    var treeElements = tree.getElementsByTagName("li");
    for (var i=0; i < treeElements.length; i++)
    {
        if (treeElements[i].getElementsByTagName("ul").length > 0)
        {
            eraseCookie("menu" + i);
            createCookie("menu" + i, treeElements[i].className , 1);
        }
        else
        {
            treeElements[i].onclick = PreventBubbleHandler; 
        }
    }    
    
}

//Finds the index of an item in an array
function IndexOf(item)
{
    for (var i=0; i < this.length; i++)
    {        
        if (this[i] == item)
        {
            return i;
        }
    }
    
    return -1;
}

//The toggle event handler for each expandable/collapsable node
//- Note that this also exists to prevent any IE memory leaks 
//(due to circular references caused by this)
function ToggleNodeStateHandler(event)
{
    ToggleClass(this, "Collapsed", "Expanded", (event == null) ? window.event : event);
}

//Prevents the onclick event from bubbling up to parent elements
function PreventBubbleHandler(event)
{
    if (!event) event = window.event;
    event.cancelBubble = true;
}

//Adds the relevant onclick handlers for the nodes in the tree view
function SetupTreeView(elementId)
{
    var tree = document.getElementById(elementId);
    var treeElements = tree.getElementsByTagName("li");
    elID = elementId;
    
    for (var i=0; i < treeElements.length; i++)
    {
        if (treeElements[i].getElementsByTagName("ul").length > 0)
        {
            treeElements[i].onclick = ToggleNodeStateHandler;
            
            curstate = readCookie("menu" + i);
            if (curstate != null) {
              treeElements[i].className = curstate;
            } else {
              //createCookie("menu" + i, treeElements[i].className, 1);
            }
        }
        else
        {
            treeElements[i].onclick = PreventBubbleHandler; 
        }
    }
}


function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}