function getPageScroll(){var yScroll;
	if (self.pageYOffset) {yScroll = self.pageYOffset;}
	else if (document.documentElement && document.documentElement.scrollTop){yScroll = document.documentElement.scrollTop;}
	else if (document.body) {yScroll = document.body.scrollTop;}
	arrayPageScroll = new Array('',yScroll)
	return arrayPageScroll;}
function getPageSize(){var xScroll, yScroll;
	if (window.innerHeight && window.scrollMaxY) {	xScroll = document.body.scrollWidth;yScroll = window.innerHeight + window.scrollMaxY;}
	else if (document.body.scrollHeight > document.body.offsetHeight){xScroll = document.body.scrollWidth;yScroll = document.body.scrollHeight;}
	else {xScroll = document.body.offsetWidth;yScroll = document.body.offsetHeight;}
	var windowWidth, windowHeight;
	if (self.innerHeight) {windowWidth = self.innerWidth;	windowHeight = self.innerHeight;}
	else if (document.documentElement && document.documentElement.clientHeight) {windowWidth = document.documentElement.clientWidth;windowHeight = document.documentElement.clientHeight;}
	else if (document.body) {windowWidth = document.body.clientWidth;windowHeight = document.body.clientHeight;}
	if(yScroll < windowHeight){pageHeight = windowHeight;}
	else {pageHeight = yScroll;}
	if(xScroll < windowWidth){pageWidth = windowWidth;}
	else {pageWidth = xScroll;}
	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)
	return arrayPageSize;}
function pause(numberMillis) {var now = new Date();var exitTime = now.getTime() + numberMillis;while (true)
	{now = new Date();if (now.getTime() > exitTime)
			return;}}
function getKey(e){if (e == null) {keyCode = event.keyCode;}
		else {keyCode = e.which;}
	key = String.fromCharCode(keycode).toLowerCase();

	if(key == 'x'){ hideLightbox(); }}
function listenKey () {	document.onkeypress = getKey; }

function showLightbox(objLink){
	var objOverlay = document.getElementById('overlay');
	var objLightbox = document.getElementById('lightbox');
	var objCaption = document.getElementById('lightboxCaption');
	var objImage = document.getElementById('lightboxImage');
	var objLightboxDetails = document.getElementById('lightboxDetails');
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();
	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';
	imgPreload = new Image();
	imgPreload.onload=function(){
		objImage.src = objLink.href;
		var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
		var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";
		objLightboxDetails.style.width = imgPreload.width + 'px';
		if(objLink.getAttribute('title')){
			objCaption.style.display = 'block';
			objCaption.innerHTML = objLink.getAttribute('title');}
			else {objCaption.style.display = 'none';}
		if (navigator.appVersion.indexOf("MSIE")!=-1){
			pause(250);}
		objLightbox.style.display = 'block';
		arrayPageSize = getPageSize();
		objOverlay.style.height = (arrayPageSize[1] + 'px');
		listenKey();
		return false;}
	imgPreload.src = objLink.href;}
function hideLightbox()
{objOverlay = document.getElementById('overlay');
	objLightbox = document.getElementById('lightbox');
	objOverlay.style.display = 'none';
	objLightbox.style.display = 'none';
	document.onkeypress = '';}
function initLightbox()
{if (!document.getElementsByTagName){ return; }
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i<anchors.length; i++){var anchor = anchors[i];
		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){
			anchor.onclick = function () {showLightbox(this); return false;}}}
	var objBody = document.getElementsByTagName("body").item(0);
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','overlay');
	objOverlay.onclick = function () {hideLightbox(); return false;}
	objOverlay.style.display = 'none';
	objOverlay.style.position = 'absolute';
	objOverlay.style.top = '0';
	objOverlay.style.left = '0';
	objOverlay.style.zIndex = '1000';
 	objOverlay.style.width = '100%';
	objBody.insertBefore(objOverlay, objBody.firstChild);
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();
	var objLightbox = document.createElement("div");
	objLightbox.setAttribute('id','lightbox');
	objLightbox.style.display = 'none';
	objLightbox.style.position = 'absolute';
	objLightbox.style.zIndex = '1000';
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#');
	objLink.setAttribute('title','Klikk!');
	objLink.onclick = function () {hideLightbox(); return false;}
	objLightbox.appendChild(objLink);
	var objImage = document.createElement("img");
	objImage.setAttribute('id','lightboxImage');
	objLink.appendChild(objImage);
	var objLightboxDetails = document.createElement("div");
	objLightboxDetails.setAttribute('id','lightboxDetails');
	objLightbox.appendChild(objLightboxDetails);
	var objCaption = document.createElement("div");
	objCaption.setAttribute('id','lightboxCaption');
	objCaption.style.display = 'none';
	objLightboxDetails.appendChild(objCaption);
	var objKeyboardMsg = document.createElement("div");
	objKeyboardMsg.setAttribute('id','keyboardMsg');
	objKeyboardMsg.innerHTML = '';
	objLightboxDetails.appendChild(objKeyboardMsg);}
function addLoadEvent(func)
{var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;}
 else {window.onload = function(){	oldonload();
		func();}}}
addLoadEvent(initLightbox);