var loadingImage = '/app/stdnat/pix/loading.gif';		
var closeButton = '/app/stdnat/pix/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 objLightboxDetails = document.getElementById('lightboxDetails');
  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";
    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);
    } 
    if (objLoadingImage) { objLoadingImage.style.display = 'none'; }
    selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++) {
      selects[i].style.visibility = "hidden";
    }
    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';
  selects = document.getElementsByTagName("select");
  for (i = 0; i != selects.length; i++) {
    selects[i].style.visibility = "visible";
  }
}
function initLightbox() {
  $$("#middle a.forZoom").each( function(el){ if( el.getAttribute("href") ) { el.onclick = function () { showLightbox(this); return false; }; } } );
  var objBody = document.body;
  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','Click to close');
  objLink.onclick = function () {hideLightbox(); return false;}
  objLightbox.appendChild(objLink);
  var imgPreloadCloseButton = new Image();
  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 = '<a href="#;" onclick="hideLightbox(); return false;">Fermer</a>';
  objLightboxDetails.appendChild(objKeyboardMsg);
}
Event.observe(window, 'load', initLightbox);