/*
Lightbox JS: Fullsize Image Overlays 
by Lokesh Dhakar - http://www.huddletogether.com

For more information on this script, visit:
http://huddletogether.com/projects/lightbox/

Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
(basically, do anything you want, just leave my name and link)

Table of Contents
-----------------
Configuration

Functions
- getPageScroll()
- getPageSize()
- pause()
- getKey()
- listenKey()
- showLightbox()
- hideLightbox()
- initLightbox()
- addLoadEvent()

Function Calls
- addLoadEvent(initLightbox)

*/



//
// Configuration
//

// If you would like to use a custom loading image or close button reference them in the next two lines.
var loadingImage = 'img/loading.gif';		
var closeButton = 'img/close.gif';		





//
// getPageScroll()
// Returns array with x,y page scroll values.
// 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()
// Returns array with page width, height and window width, height
// 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)
			  // Pauses code execution for specified time. Uses busy code, not good.
			  // 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;
		     }
		     }
		     
		     //
		     // getKey(key)
		     // Gets keycode. If 'x' is pressed then it hides the lightbox.
		     //
		     
		     function getKey(e){
		     if (e == null) { // ie
		     keycode = event.keyCode;
		     } else { // mozilla
		     keycode = e.which;
		     }
		     key = String.fromCharCode(keycode).toLowerCase();
		     
		     if(key == 'x'){ hideLightbox(); }
		     }
		     
		     
		     //
		     // listenKey()
		     //
		     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,
										// this prevents the previous image displaying for a short burst causing flicker.
										if (navigator.appVersion.indexOf("MSIE")!=-1){
										pause(250);
										} 
										
										if (objLoadingImage) {	objLoadingImage.style.display = 'none'; }
										
										// Hide select boxes as they will 'peek' through the image in IE
										selects = document.getElementsByTagName("select");
										for (i = 0; i != selects.length; i++) {
										selects[i].style.visibility = "hidden";
										}
										
										
										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
										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';
										
										// make select boxes visible
										selects = document.getElementsByTagName("select");
										for (i = 0; i != selects.length; i++) {
										selects[i].style.visibility = "visible";
										}
										
										// disable keypress listener
										document.onkeypress = '';
										}
										
										
										
										
										//
										// initLightbox()
										// Function runs on window load, going through link tags looking for rel="lightbox".
										// These links receive onclick events that enable the lightbox display for their targets.
										// The function also inserts html markup at the top of the page which will be used as a
										// container for the overlay pattern and the inline image.
										//
										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 that looks like this:
										//
										// <div id="overlay">
										//		<a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a>
										//	</div>
									// <div id="lightbox">
										//		<a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image">
										//			<img id="closeButton" />		
										//			<img id="lightboxImage" />
										//		</a>
									//		<div id="lightboxDetails">
										//			<div id="lightboxCaption"></div>
										//			<div id="keyboardMsg"></div>
										//		</div>
									// </div>
								
								var objBody = document.getElementsByTagName("body").item(0);
								
								// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
								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 = '90';
								objOverlay.style.width = '100%';
								objBody.insertBefore(objOverlay, objBody.firstChild);
								
								var arrayPageSize = getPageSize();
								var arrayPageScroll = getPageScroll();
								
								// preload and create loader image
								var imgPreloader = new Image();
								
								// if loader image found, 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(){};	//	clear onLoad, as IE will flip out w/animated gifs
								
								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 = '200';	
								objBody.insertBefore(objLightbox, objOverlay.nextSibling);
								
								// create link
								var objLink = document.createElement("a");
								objLink.setAttribute('href','#');
								objLink.setAttribute('title','Click to close');
								objLink.onclick = function () {hideLightbox(); return false;}
								objLightbox.appendChild(objLink);
								
								// preload and create close button image
								var imgPreloadCloseButton = new Image();
								
								// if close button image found, 
								imgPreloadCloseButton.onload=function(){
								
								var objCloseButton = document.createElement("img");
								objCloseButton.src = closeButton;
								objCloseButton.setAttribute('id','closeButton');
								objCloseButton.style.position = 'absolute';
								objCloseButton.style.zIndex = '200';
								objLink.appendChild(objCloseButton);
								
								return false;
								}
								
								imgPreloadCloseButton.src = closeButton;
								
								// 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);
								
								// create keyboard message
								var objKeyboardMsg = document.createElement("div");
								objKeyboardMsg.setAttribute('id','keyboardMsg');
								objKeyboardMsg.innerHTML = 'Presione <a href="#" onclick="hideLightbox(); return false;"><kbd>X</kbd></a> para cerrar';
								objLightboxDetails.appendChild(objKeyboardMsg);
								
								
								}
								
								
								
								
								//
								// 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