/*	Lightbox JS: Fullsize Image Overlays by Lokesh Dhakar - http://www.huddletogether.com
	For more information on this script, visit:	http://huddletogether.com/projects/lightbox/
	Script featured on Dynamic Drive code library Jan 24th, 06': http://www.dynamicdrive.com
	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
*/

// Configuration

// custom loading image or close button
var loadingImage = 'scripts/loading_lightbox.gif';		
var closeButton = '';		

// getPageScroll()
// Core code from - quirksmode.org
function getPageScroll(){
	var yScroll;
	if (self.pageYOffset) { yScroll = self.pageYOffset; }
	else if (document.documentElement && document.documentElement.scrollTop){ // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop; }
	else if (document.body) { // all other Explorers
		yScroll = document.body.scrollTop; }
	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll; }

// getPageSize()
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
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){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight; }
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight; }	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){	pageHeight = windowHeight; } else { pageHeight = yScroll; }
	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth) { pageWidth = windowWidth; } else { pageWidth = xScroll; }

	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize; }

// pause(numberMillis)
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) { now = new Date(); if (now.getTime() > exitTime) return; } }

// listenKey()
// mudado por mim - function listenKey () {	document.onkeypress = getKey; }

// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
function showLightbox(objLink)
{	// prep objects
var objOverlay = document.getElementById('overlay');
var objLightbox = document.getElementById('lightbox');
var objCaption = document.getElementById('lightboxCaption');
var objImage = document.getElementById('lightboxImage');
var objLoadingImage = document.getElementById('loadingImage');
var objLightboxDetails = document.getElementById('lightboxDetails');
var arrayPageSize = getPageSize();
var arrayPageScroll = getPageScroll();

// center loadingImage if it exists
if (objLoadingImage) {
	objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
	objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
	objLoadingImage.style.display = 'block'; }

// set height of Overlay to take up whole page and show
objOverlay.style.height = (arrayPageSize[1] + 'px');
objOverlay.style.display = 'block';

// preload image
imgPreload = new Image();
imgPreload.onload=function(){
objImage.src = objLink.href;

// center lightbox and make sure that the top and left values are not negative and the image placed outside the viewport
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.style.width = imgPreload.width + 'px';
	objCaption.innerHTML = objLink.getAttribute('title');
} else { objCaption.style.display = 'none'; }

// A small pause between the image loading and displaying is required with IE,
	if (navigator.appVersion.indexOf("MSIE")!=-1){ pause(250); } 
	if (objLoadingImage) {	objLoadingImage.style.display = 'none'; }
	objLightbox.style.display = 'block';

// After image is loaded, update the overlay height as the new image might have increased the overall page height.
	arrayPageSize = getPageSize();
	objOverlay.style.height = (arrayPageSize[1] + 'px');

// Check for 'x' keypress
// mudado por mim - listenKey();

return false; }
imgPreload.src = objLink.href; }

// hideLightbox()
function hideLightbox() { // get objects
	objOverlay = document.getElementById('overlay');
	objLightbox = document.getElementById('lightbox');
	// hide lightbox and overlay
	objOverlay.style.display = 'none';
	objLightbox.style.display = 'none';
	// disable keypress listener
	document.onkeypress = ''; }

// initLightbox()
function initLightbox() {
	if (!document.getElementsByTagName){ return; }
	var anchors = document.getElementsByTagName("a");

// loop through all anchor tags
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;}
} }

// the rest of this code inserts html at the top of the page
var objBody = document.getElementsByTagName("body").item(0);

// create overlay div and hardcode some functional styles
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 = '99';
objOverlay.style.width = '100%';
objBody.insertBefore(objOverlay, objBody.firstChild);
	
var arrayPageSize = getPageSize();
var arrayPageScroll = getPageScroll();

// preload and create loader image
var imgPreloader = new Image();
	
// create link to hide lightbox and create loadingimage
imgPreloader.onload=function(){

var objLoadingImageLink = document.createElement("a");
objLoadingImageLink.setAttribute('href','#');
objLoadingImageLink.onclick = function () {hideLightbox(); return false;}
objOverlay.appendChild(objLoadingImageLink);
	
var objLoadingImage = document.createElement("img");
objLoadingImage.src = loadingImage;
objLoadingImage.setAttribute('id','loadingImage');
objLoadingImage.style.position = 'absolute';
objLoadingImage.style.zIndex = '150';
objLoadingImageLink.appendChild(objLoadingImage);
imgPreloader.onload=function(){};
return false; }

imgPreloader.src = loadingImage;

// create lightbox div, same note about styles as above
var objLightbox = document.createElement("div");
objLightbox.setAttribute('id','lightbox');
objLightbox.style.display = 'none';
objLightbox.style.position = 'absolute';
objLightbox.style.zIndex = '100';	
objBody.insertBefore(objLightbox, objOverlay.nextSibling);
	
// create link
var objLink = document.createElement("a");
objLink.setAttribute('href','#');
objLink.setAttribute('title','Clique para fechar');
objLink.onclick = function () {hideLightbox(); return false;}
objLightbox.appendChild(objLink);

// create image
var objImage = document.createElement("img");
objImage.setAttribute('id','lightboxImage');
objLink.appendChild(objImage);
	
// create details div, a container for the caption and keyboard message
var objLightboxDetails = document.createElement("div");
objLightboxDetails.setAttribute('id','lightboxDetails');
objLightbox.appendChild(objLightboxDetails);

// create caption
var objCaption = document.createElement("div");
objCaption.setAttribute('id','lightboxCaption');
objCaption.style.display = 'none';
objLightboxDetails.appendChild(objCaption);
}

// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload functions.
// Function found at Simon Willison's weblog - http://simon.incutio.com/
function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){ window.onload = func; } else { window.onload = function(){ oldonload(); func(); } }
}

addLoadEvent(initLightbox);	// run initLightbox onLoad