var level2MaxCount = 10; //expected maximum of Level 2 items
var level3MaxCount = 10; //expected maximum of Level 3 items

var currentLevel2 = '';
var currentLevel3 = '';

var elementOnLeave = null;

function hoverLevel2(selectedElementIndex)
{
	for (var i = 1; i <= level2MaxCount; i++)
	{
		//blank every level 2 item's style class
		var element = document.getElementById('nav' + i);
		if (element != null)
		{
			//maintain the boldness for the current item
			if (currentLevel2 == i)
				element.className = 'current';
			else
				element.className = '';
			
			var elementMenu = document.getElementById('nav' + i + 'Menu');
			if (elementMenu != null)
			{
				//hide every level 3 item menu
				elementMenu.style.display = 'none';
			}
		}
		else
			break;
	}
	
	//only apply the style class to the level 2 item that is current hovered
	var selected = document.getElementById('nav' + selectedElementIndex);
	if (selectedElementIndex == currentLevel2)
		selected.className = 'over selected current';
	else
		selected.className = 'over selected';
	
	//only show the level 3 item menu for the current level 2 item hovered
	var selectedMenu = document.getElementById('nav' + selectedElementIndex + 'Menu');
	selectedMenu.style.display = '';
}

function hoverLevel3(selectedElementIndex)
{
	var selectedLevel2Index = selectedElementIndex.substr(0, 1);
	var startLevel3Index = parseInt(selectedLevel2Index + '1');

	for (var i = startLevel3Index; i < startLevel3Index + level3MaxCount; i++)
	{
		//blank every level 3 item's style class
		var element = document.getElementById('nav' + i);
		if (element != null)
		{
			//maintain the boldness for the current item
			if (currentLevel3 == i)
				element.className = 'current';
			else
				element.className = '';
		}
		else
			break;
	}
	
	//only apply the style class to the level 3 item that is current hovered
	var selected = document.getElementById('nav' + selectedElementIndex);
	if (selectedElementIndex == currentLevel3)
		selected.className = 'over selected current';
	else
		selected.className = 'over selected';
}


function mouseoutLevel2(selectedElementIndex)
{
	//blank every level 3 item's style class after mouse leaves
	var startLevel3Index = parseInt(selectedElementIndex + '1');

	for (var i = startLevel3Index; i < startLevel3Index + level3MaxCount; i++)
	{
		var element = document.getElementById('nav' + i);
		if (element != null)
		{
			//maintain the boldness for the current item
			if (currentLevel3 == i)
				element.className = 'over current';
			else
				element.className = '';
		}
		else
			break;
	}
}

function resetMenuState()
{
	//blank every level 2 item's style class
	for (var i = 1; i <= level2MaxCount; i++)
	{
		var element = document.getElementById('nav' + i);
		if (element != null)
		{
			element.className = '';
			
			//hide every level 3 item menu
			var elementMenu = document.getElementById('nav' + i + 'Menu');
			if (elementMenu != null)
				elementMenu.style.display = 'none';
			
			//blank every level 3 item's style class
			var startLevel3Index = parseInt(i + '1');
			for (var i2 = startLevel3Index; i2 < startLevel3Index + level3MaxCount; i2++)
			{
				var subelement = document.getElementById('nav' + i2);
				if (subelement != null)
					subelement.className = '';
				else
					break;
			}
		}
		else
			break;
	}
	
	//only apply the style class to the level 2 item that is current
	var currentLevel2Element = document.getElementById('nav' + currentLevel2);
	if (currentLevel3 == '')
		currentLevel2Element.className = 'over selected current';
	else
		currentLevel2Element.className = 'selected current';
	
	//only show the level 3 item menu for the current level 2 item
	var selectedMenu = document.getElementById('nav' + currentLevel2 + 'Menu');
	selectedMenu.style.display = '';
	
	//only apply the style class to the level 3 item that is current
	var currentLevel3Element = document.getElementById('nav' + currentLevel3);
	if (currentLevel3 != null && currentLevel3 != '')
		currentLevel3Element.className = 'over selected current';
}

function onNavigationEnter(e)
{		
	// NOTE: Non-IE browsers doesn't pass the event object (e) as a parameter this is for Firefox compatability
	if (!e) //specifically for IE
		var e = window.event;
	var tg = (window.event) ? e.srcElement : e.target;

	if (isInNavigation(elementOnLeave) && !isInNavigation(tg))
		resetMenuState();
}
  
function onNavigationLeave(e)
{
	// NOTE: Non-IE browsers doesn't pass the event object (e) as a parameter this is for Firefox compatability
	if (!e) //specifically for IE
		var e = window.event;
	elementOnLeave = (window.event) ? e.srcElement : e.target;
}

//whether a given element node belong in the navigation panel
function isInNavigation(targetElement)
{
	var found = false;
	
	if (targetElement != null)
	{
		if (targetElement.id == 'mainnav')
			found = true;
	
		var tg = targetElement.parentNode;
		while (tg != null)
		{
			if (tg.nodeName == 'BODY')
				break;
			if (tg.id == 'mainnav')
			{
				found = true;
				break;
			}
			tg = tg.parentNode;
		}
	}
	
	return found;
}

function showDropdownMenu(selectedElementIndex)
{
	//hide all other drop down menus
	for (var i = 1; i <= level2MaxCount; i++)
	{
		var elementMenu = document.getElementById('nav' + i + 'Menu');
		if (elementMenu != null)
			elementMenu.style.display = 'none';
	}
	
	//blank every drop down item's style class
	for (var i = 1; i <= level3MaxCount; i++)
	{
		var subelement = document.getElementById('nav' + selectedElementIndex + i);
		if (subelement != null)
			subelement.className = '';
		else
			break;
	}
	
	//show only the drop down menu that the mouse is hovered
	var selectedMenu = document.getElementById('nav' + selectedElementIndex + 'Menu');
	if (selectedMenu != null)
		selectedMenu.style.display = 'block';
}

function onDropdownMenuEnter(e)
{		
	// NOTE: Non-IE browsers doesn't pass the event object (e) as a parameter this is for Firefox compatability
	if (!e) //specifically for IE
		var e = window.event;
	var tg = (window.event) ? e.srcElement : e.target;
	
	if (isInNavigation(elementOnLeave) && !isInNavigation(tg))
		showDropdownMenu('');
}

function onDropdownMenuLeave(e)
{
	// NOTE: Non-IE browsers doesn't pass the event object (e) as a parameter this is for Firefox compatability
	if (!e) //specifically for IE
		var e = window.event;
	elementOnLeave = (window.event) ? e.srcElement : e.target;
}


//macromedia rollover image
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}