var loadingImage='imagenes/loading.gif';		
var closeButton='imagenes/close.gif';	
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 showLightbox(objLink){
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 arrayPageSize=getPageSize();
var arrayPageScroll=getPageScroll();
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';}
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";
if(objLink.getAttribute('title')){
objCaption.style.display='block';
objCaption.style.width=imgPreload.width+'px';
objCaption.innerHTML=objLink.getAttribute('title');
}
else{
objCaption.style.display='none';}
if(navigator.appVersion.indexOf("MSIE")!=-1){
pause(250);} 
objLoadingImage.style.display='none';
objLightbox.style.display='block';
arrayPageSize=getPageSize();
objOverlay.style.height=(arrayPageSize[1]+'px');
return false;}
imgPreload.src=objLink.href;}
function hideLightbox(){
objOverlay=document.getElementById('overlay');
objLightbox=document.getElementById('lightbox');
objOverlay.style.display='none';
objLightbox.style.display='none';}
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='90';
objOverlay.style.width='100%';
objBody.insertBefore(objOverlay,objBody.firstChild);
var arrayPageSize=getPageSize();
var arrayPageScroll=getPageScroll();
var imgPreloader=new Image();
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;
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);	
var objLink=document.createElement("a");
objLink.setAttribute('href','#');
objLink.setAttribute('title','Haga click para cerrar');
objLink.onclick=function(){hideLightbox(); return false;}
objLightbox.appendChild(objLink);
var imgPreloadCloseButton=new Image();
imgPreloadCloseButton.onload=function(){
var objCloseButton=document.createElement("img");
objCloseButton.src=closeButton;
objCloseButton.setAttribute('id','closeButton');
objCloseButton.style.position='absolute';
objCloseButton.style.zIndex='200';
objCloseButton.style.top='5px';		
objCloseButton.style.right='5px';		
objLink.appendChild(objCloseButton);
return false;}
imgPreloadCloseButton.src=closeButton;
var objImage=document.createElement("img");
objImage.setAttribute('id','lightboxImage');
objLink.appendChild(objImage);
var objCaption=document.createElement("div");
objCaption.setAttribute('id','lightboxCaption');
objCaption.style.display='none';
objLightbox.appendChild(objCaption);}
function addLoadEvent(func){	
var oldonload=window.onload;
if(typeof window.onload!='function'){
window.onload=func;
}else{
window.onload=function(){
oldonload();
func();}}}
addLoadEvent(initLightbox);