var isDOM = (document.getElementById ? true : false); 
var isIE4 = ((document.all && !isDOM) ? true : false);
var isNS4 = (document.layers ? true : false);

function getRef(id) 
{
	if (isDOM) 
		return document.getElementById(id);
	if (isIE4) 
		return document.all[id];
	If (isNS4) 
		return document.layers[id];
}

function getSty(id) 
{
	return (isNS4 ? getRef(id) : getRef(id).style);
} 

// Hide tImeout.
var popTimer = 0;

// Array showing highlighted menu items.
var litNow = new Array();

function popOver(menuNum, itemNum) 
{
	clearTimeout(popTimer);
	hideAllBut(menuNum);
	litNow = getTree(menuNum, itemNum);
	changeCol(litNow, true);
	targetNum = menu[menuNum][itemNum].target;
	if (targetNum > 0) 
	{
		thisX = parseInt(menu[menuNum][0].ref.left) + parseInt(menu[menuNum][itemNum].ref.left);
		thisY = parseInt(menu[menuNum][0].ref.top) + parseInt(menu[menuNum][itemNum].ref.top);
		with (menu[targetNum][0].ref) 
		{
			left = parseInt(thisX + menu[targetNum][0].x);
			top = parseInt(thisY + menu[targetNum][0].y);
			visibility = 'visible';
	      }
	}
}

function popOut(menuNum, itemNum) 
{
	if ((menuNum == 0) && !menu[menuNum][itemNum].target)
		hideAllBut(0)
	else
		popTimer = setTimeout('hideAllBut(0)', 500);
}

function getTree(menuNum, itemNum) 
{
	// Array index is the menu number. The contents are null (if that menu is not a parent)
	// or the item number in that menu that is an ancestor (to light it up).
	itemArray = new Array(menu.length);

	while (1) 
	{
		itemArray[menuNum] = itemNum;
		// If we've reached the top of the hierarchy, return.
		if (menuNum == 0) return itemArray;
			itemNum = menu[menuNum][0].parentItem;
		menuNum = menu[menuNum][0].parentMenu;
   	}
}

// Pass an array and a boolean to specify colour change, true = over colour.
function changeCol(changeArray, isOver) 
{
	for (menuCount = 0; menuCount < changeArray.length; menuCount++) 
	{
		if (changeArray[menuCount]) 
		{
			newCol = isOver ? menu[menuCount][0].overCol : menu[menuCount][0].backCol;
			// Change the colours of the div/layer background.
			with (menu[menuCount][changeArray[menuCount]].ref) 
			{
				if (isNS4) bgColor = newCol;
				else backgroundColor = newCol;
			}
		}
	}
}

function hideAllBut(menuNum) 
{
	var keepMenus = getTree(menuNum, 1);
	for (count = 0; count < menu.length; count++)
		if (!keepMenus[count])
			menu[count][0].ref.visibility = 'hidden';
	changeCol(litNow, false);
}



// *** MENU CONSTRUCTION FUNCTIONS ***

function Menu(isVert, popInd, x, y, width, overCol, backCol, borderClass, textClass) 
{
	// True or false - a vertical menu?
	this.isVert = isVert;
	// The popout indicator used (if any) for this menu.
	this.popInd = popInd
	// Position and size settings.
	this.x = x;
	this.y = y;
	this.width = width;
	// Colours of menu and items.
	this.overCol = overCol;
	this.backCol = backCol;
	// The stylesheet class used for item borders and the text within items.
	this.borderClass = borderClass;
	this.textClass = textClass;
	// Parent menu and item numbers, indexed later.
	this.parentMenu = null;
	this.parentItem = null;
	// Reference to the object's style properties (set later).
	this.ref = null;
}

function Item(text, href, frame, length, spacing, target) 
{
	this.text = text;
	this.href = href;
	this.frame = frame;
	this.length = length;
	this.spacing = spacing;
	this.target = target;
	// Reference to the object's style properties (set later).
	this.ref = null;
}

function writeMenus() 
{
	if (!isDOM && !isIE4 && !isNS4) 
		return;

	for (currMenu = 0; currMenu < menu.length; currMenu++) with (menu[currMenu][0]) 
	{
		// Variable for holding HTML for items and positions of next item.
		var str = '', itemX = 0, itemY = 0;

		// Remember, items start from 1 in the array (0 is menu object itself, above).
		// Also use properties of each item nested in the other with() for construction.
		for (currItem = 1; currItem < menu[currMenu].length; currItem++) with (menu[currMenu][currItem]) 
		{
			var itemID = 'menu' + currMenu + 'item' + currItem;

			// The width and height of the menu item - dependent on orientation!
			var w = (isVert ? width : length);
			var h = (isVert ? length : width);

			// Create a div or layer text string with appropriate styles/properties.
			// Thanks to Paul Maden (www.paulmaden.com) for helping debug this in IE4, apparently
			// the width must be a miniumum of 3 for it to work in that browser.
			if (isDOM || isIE4) 
			{
				str += '<div id="' + itemID + '" style="position: absolute; left: ' + itemX + '; top: ' + itemY + '; width: ' + w + '; height: ' + h + '; visibility: inherit; ';
				if (backCol) 
					str += 'background: ' + backCol + '; ';
				str += '" ';
			}
			if (isNS4) 
			{
				str += '<layer id="' + itemID + '" left="' + itemX + '" top="' + itemY + '" width="' +  w + '" height="' + h + '" visibility="inherit" ';
				if (backCol) 
					str += 'bgcolor="' + backCol + '" ';
			}
			if (borderClass) 
				str += 'class="' + borderClass + '" ';

			// Add mouseover handlers and finish div/layer.
			str += 'onMouseOver="popOver(' + currMenu + ',' + currItem + ')" onMouseOut="popOut(' + currMenu + ',' + currItem + ')">';

			// Add contents of item (default: table with link inside).
			// In IE/NS6+, add padding if there's a border to emulate NS4's layer padding.
			// If a target frame is specified, also add that to the <a> tag.

			str += '<table width="' + (w - 8) + '" border="0" cellspacing="0" cellpadding="' + (!isNS4 && borderClass ? 3 : 0) + '"><tr><td align="left" height="' + (h - 7) + '">' + '<a class="' + textClass + '" href="' + href + '"' + (frame ? ' target="' + frame + '">' : '>') + text + '</a></td>';
			if (target > 0) 
			{
				// Set target's parents to this menu item.
				menu[target][0].parentMenu = currMenu;
				menu[target][0].parentItem = currItem;

				// Add a popout indicator.
				if (popInd) str += '<td class="' + textClass + '" align="right">' + popInd + '</td>';
			}
			str += '</tr></table>' + (isNS4 ? '</layer>' : '</div>');
			if (isVert) itemY += length + spacing;
			else itemX += length + spacing;
		}
		if (isDOM) 
		{
			var newDiv = document.createElement('div');
			document.getElementsByTagName('body').item(0).appendChild(newDiv);
			newDiv.innerHTML = str;
			ref = newDiv.style;
			ref.position = 'absolute';
			ref.visibility = 'hidden';
		}

		// Insert a div tag to the end of the BODY with menu HTML in place for IE4.
		if (isIE4) 
		{
			document.body.insertAdjacentHTML('beforeEnd', '<div id="menu' + currMenu + 'div" ' + 'style="position: absolute; visibility: hidden">' + str + '</div>');
			ref = getSty('menu' + currMenu + 'div');
		}

		// In NS4, create a reference to a new layer and write the items to it.
		if (isNS4) 
		{
			ref = new Layer(0);
			ref.document.write(str);
			ref.document.close();
		}

		for (currItem = 1; currItem < menu[currMenu].length; currItem++) 
		{
			itemName = 'menu' + currMenu + 'item' + currItem;
			if (isDOM || isIE4) 
				menu[currMenu][currItem].ref = getSty(itemName);
			if (isNS4) 
				menu[currMenu][currItem].ref = ref.document[itemName];
		}
	}
	with(menu[0][0]) 
	{
		ref.left = x;
		ref.top = y;
		ref.visibility = 'visible';
	}
}

// Syntaxes: *** START EDITING HERE, READ THIS SECTION CAREFULLY! ***
//
// menu[menuNumber][0] = new Menu(Vertical menu? (true/false), 'popout indicator', left, top,
// width, 'mouseover colour', 'background colour', 'border stylesheet', 'text stylesheet');
//
// Left and Top are measured on-the-fly relative to the top-left corner of its trigger, or
// for the root menu, the top-left corner of the page.
//
// menu[menuNumber][itemNumber] = new Item('Text', 'URL', 'target frame', length of menu item,
//  additional spacing to next menu item, number of target menu to popout);
//
// If no target menu (popout) is desired, set it to 0. Likewise, if your site does not use
// frames, pass an empty string as a frame target.
//
// Something that needs explaining - the Vertical Menu setup. You can see most menus below
// are 'true', that is they are vertical, except for the first root menu. The 'length' and
// 'width' of an item depends on its orientation -- length is how long the item runs for in
// the direction of the menu, and width is the lateral dimension of the menu. Just look at
// the examples and tweak the numbers, they'll make sense eventually :).

var menu = new Array();

// Default colours passed to most menu constructors (just passed to functions, not
// a global variable - makes things easier to change later in bulk).
var defOver = '#90BCDC', defBack = '#2079B8';

// Default 'length' of menu items - item height if menu is vertical, width if horizontal.
var defLength = 22;

// Menu 0 is the special, 'root' menu from which everything else arises.
menu[0] = new Array();
// A non-vertical menu with a few different colours and no popout indicator, as an example.
// *** MOVE ROOT MENU AROUND HERE ***  it's positioned at (5, 0) and is 17px high now.
menu[0][0] = new Menu(false, '', 5, 0, 17, defOver, defBack, '', 'itemText');
// Notice how the targets are all set to nonzero values...
// The 'length' of each of these items is 40, and there is spacing of 10 to the next item.
// Most of the links are set to '#' hashes, make sure you change them to actual files.
menu[0][1] = new Item('About', '#', '', 50, 0, 1);
menu[0][2] = new Item('Documentation', '#', '', 100, 0, 2);
menu[0][3] = new Item('Resources', '#', '', 80, 0, 7);
menu[0][4] = new Item('News', '#', '', 50, 0, 8);
menu[0][5] = new Item('Download', '#', '', 80, 0, 9);


// About Menu.
menu[1] = new Array();
menu[1][0] = new Menu(true, '>', 0, 22, 140, defOver, defBack, 'itemBorder', 'itemText');
menu[1][1] = new Item('Home', '/home.html', '', defLength, 0, 0);
menu[1][2] = new Item('History', '/wherewecamefrom.html', '', defLength, 0, 0);
//menu[1][3] = new Item('Credits', '/credits.html', '', defLength, 0, 0);
menu[1][3] = new Item('License', '/license.txt', '', defLength, 0, 0);
menu[1][4] = new Item('Contact', '/contact.html', '', defLength, 0, 0);

// Documentation.
menu[2] = new Array();
menu[2][0] = new Menu(true, '>', 0, 22, 140, defOver, defBack, 'itemBorder', 'itemText');
menu[2][1] = new Item('Technical', '#', '', defLength, 0, 3);
menu[2][2] = new Item('Guides', '#', '', defLength, 0, 4);
menu[2][3] = new Item('Developers', '#', '', defLength, 0, 5);
menu[2][4] = new Item('Users', '#', '', defLength, 0, 6);

// Documentation/Technical
menu[3] = new Array();
menu[3][0] = new Menu(true, '>', 140, 0, 140, defOver, defBack, 'itemBorder', 'itemText');
menu[3][1] = new Item('A-Select OCD', '/doc/aselect1.4.1.ocd.html', '', defLength, 0, 0);
menu[3][2] = new Item('System Overview', '/aselect_overview.html', '', defLength, 0, 0);
menu[3][3] = new Item('Authentication Flows', '/functional_flows.html', '', defLength, 0, 0);

//Documentation/Guides
menu[4] = new Array();
menu[4][0] = new Menu(true, '>', 140, 0, 190, defOver, defBack, 'itemBorder', 'itemText');
menu[4][1] = new Item('A-Select Quickstart Guide', '/version/1.5/quickstart.html', '', defLength, 0, 0);
menu[4][2] = new Item('A-Select Deployment Guides', '/version/1.5/guides.html#deployment', '', defLength, 0, 0);
menu[4][3] = new Item('A-Select Configuration Guides', '/version/1.5/guides.html#configuration', '', defLength, 0, 0);


//Documentation/Developers
menu[5] = new Array();
menu[5][0] = new Menu(true, '>', 140, 0, 150, defOver, defBack, 'itemBorder', 'itemText');
menu[5][1] = new Item('A-Select API', '/version/1.5/api/api.html', '', defLength, 0, 0);
menu[5][2] = new Item('A-Select Javadoc', '/version/1.5/javadoc/index.html', '', defLength, 0, 0);
menu[5][3] = new Item('Developing an AuthSP', '/version/1.5/authsp_howto.html', '', defLength, 0, 0);

//Documentation/Users
menu[6] = new Array();
menu[6][0] = new Menu(true, '>', 140, 0, 120, defOver, defBack, 'itemBorder', 'itemText');
menu[6][1] = new Item('Usage Principles', '/version/1.2/users/principles.html', '', defLength, 0, 0);
menu[6][2] = new Item('Usage Scenario', '/version/1.2/users/usage.html', '', defLength, 0, 0);


// Resources
menu[7] = new Array();
menu[7][0] = new Menu(true, '>', 0, 22, 180, defOver, defBack, 'itemBorder', 'itemText');
menu[7][1] = new Item('Register', '/register15.html', '', defLength, 0, 0);
menu[7][2] = new Item('Support', '/support/support.html', '', defLength, 0, 0);
//menu[7][3] = new Item('Mob@c', '/support/mobac.html', '', defLength, 0, 0);
menu[7][3] = new Item('FAQ', '/version/1.5/faq/faq.html', '', defLength, 0, 0);
menu[7][4] = new Item('A-Select Mailinglist', 'http://nic.surfnet.nl/archives/a-select.html', '', defLength, 0, 0);
menu[7][5] = new Item('Sites Running A-Select', '/sites/sites.html', '', defLength, 0, 0);
menu[7][6] = new Item('A-Select Enabled Applications', '/applications/applications.html', '', defLength, 0, 0);
menu[7][7] = new Item('Links', '#', '', defLength, 0, 10);

//Resources/Links
menu[10] = new Array();
menu[10][0] = new Menu(true, '>', 180, 0, 180, defOver, defBack, 'itemBorder', 'itemText');
menu[10][1] = new Item('SURF Foundation', 'http://www.surf.nl/', '_blank', defLength, 0, 0); 
menu[10][2] = new Item('SURFnet Innovation (Dutch)', 'http://www.surfnet.nl/surfnet-innovatie/', '_blank', defLength, 0, 0); 
menu[10][3] = new Item('Alfa & Ariss', 'http://www.alfa-ariss.com', '_blank', defLength, 0, 0);


// News
menu[8] = new Array();
menu[8][0] = new Menu(true, '>', 0, 22, 100, defOver, defBack, 'itemBorder', 'itemText');
menu[8][1] = new Item('Latest News', '/news/news.html', '', defLength, 0, 0);

// Download
menu[9] = new Array();
menu[9][0] = new Menu(true, '>', 0, 22, 140, defOver, defBack, 'itemBorder', 'itemText');
menu[9][1] = new Item('A-Select', '/version/1.5.7/download.html', '', defLength, 0, 0);
menu[9][2] = new Item('Release Candidates', '/releasecandidates.html', '', defLength, 0, 0);
//menu[9][2] = new Item('Release Candidates', '/version/1.5/release_candidates/releasecandidates.html', '', defLength, 0, 0);
//menu[9][2] = new Item('A-Select (sources)', '/version/1.4.1/download.html#sources', '', defLength, 0, 0);
//menu[9][3] = new Item('A-Select ICs', '/version/1.4.1/download.html#ic', '', defLength, 0, 0);


// *** OPTIONAL CODE FROM HERE DOWN ***

// These two lines handle the window resize bug in NS4. See <body onResize="...">.
// I recommend you leave this here as otherwise when you resize NS4's width menus are hidden.

var popOldWidth = window.innerWidth;
nsResizeHandler = new Function('if (popOldWidth != window.innerWidth) location.reload()');


// This is a quick snippet that captures all clicks on the document and hides the menus
// every time you click. Use if you want.

if (isNS4) document.captureEvents(Event.CLICK);
document.onclick = clickHandle;

function clickHandle(evt)
{
	if (isNS4) 
		document.routeEvent(evt);
	hideAllBut(0);
}


// This is just the moving command for the example.

function moveRoot()
{
	with(menu[0][0].ref) 
		left = ((parseInt(left) < 100) ? 100 : 5);
}