LightboxOptions = Object.extend({
fileLoadingImage:		'images/loading.gif',	 
fileBottomNavCloseImage: 'images/closelabel.gif',
overlayOpacity: 0.8,
animate: true,
resizeSpeed: 7,
borderSize: 10,
labelImage: "Obraz",
labelOf: "z"
}, window.LightboxOptions || {});
var Lightbox = Class.create();
Lightbox.prototype = {
imageArray: [],
activeImage: undefined,
initialize: function() {	
this.updateImageList();
this.keyboardAction = this.keyboardAction.bindAsEventListener(this);
if (LightboxOptions.resizeSpeed > 10) LightboxOptions.resizeSpeed = 10;
if (LightboxOptions.resizeSpeed < 1)  LightboxOptions.resizeSpeed = 1;
this.resizeDuration = LightboxOptions.animate ? ((11 - LightboxOptions.resizeSpeed) * 0.15) : 0;
this.overlayDuration = LightboxOptions.animate ? 0.2 : 0;
var size = (LightboxOptions.animate ? 250 : 1) + 'px';
var objBody = $$('body')[0];
objBody.appendChild(Builder.node('div',{id:'overlay'}));
objBody.appendChild(Builder.node('div',{id:'lightbox'}, [
  Builder.node('div',{id:'outerImageContainer'}, 
	  Builder.node('div',{id:'imageContainer'}, [
		  Builder.node('img',{id:'lightboxImage'}), 
		  Builder.node('div',{id:'hoverNav'}, [
			  Builder.node('a',{id:'prevLink', href: '#' }),
			  Builder.node('a',{id:'nextLink', href: '#' })
		  ]),
		  Builder.node('div',{id:'loading'}, 
			  Builder.node('a',{id:'loadingLink', href: '#' }, 
				  Builder.node('img', {src: LightboxOptions.fileLoadingImage})
			  )
		  )
	  ])
  ),
  Builder.node('div', {id:'imageDataContainer'},
	  Builder.node('div',{id:'imageData'}, [
		  Builder.node('div',{id:'imageDetails'}, [
			  Builder.node('span',{id:'caption'}),
			  Builder.node('span',{id:'numberDisplay'})
		  ]),
		  Builder.node('div',{id:'bottomNav'},
			  Builder.node('a',{id:'bottomNavClose', href: '#' },
				  Builder.node('img', { src: LightboxOptions.fileBottomNavCloseImage })
			  )
		  )
	  ])
  )
]));
$('overlay').hide().observe('click', (function() { this.end(); }).bind(this));
$('lightbox').hide().observe('click', (function(event) { if (event.element().id == 'lightbox') this.end(); }).bind(this));
$('outerImageContainer').setStyle({ width: size, height: size });
$('prevLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));
$('nextLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage + 1); }).bindAsEventListener(this));
$('loadingLink').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
$('bottomNavClose').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
var th = this;
(function(){
  var ids = 
	  'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink ' + 
	  'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose';   
  $w(ids).each(function(id){ th[id] = $(id); });
}).defer();
},
updateImageList: function() {   
this.updateImageList = Prototype.emptyFunction;
document.observe('click', (function(event){
  var target = event.findElement('a[rel^=lightbox]') || event.findElement('area[rel^=lightbox]');
  if (target) {
	  event.stop();
	  this.start(target);
  }
}).bind(this));
},
start: function(imageLink) {	

$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });
var arrayPageSize = this.getPageSize();
$('overlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });

new Effect.Appear(this.overlay, { duration: this.overlayDuration, from: 0.0, to: LightboxOptions.overlayOpacity });

this.imageArray = [];
var imageNum = 0;	   

if ((imageLink.rel == 'lightbox')){
  this.imageArray.push([imageLink.href, imageLink.title]);		 
} else {
  this.imageArray = 
	  $$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]').
	  collect(function(anchor){ return [anchor.href, anchor.title]; }).
	  uniq();
  while (this.imageArray[imageNum][0] != imageLink.href) { imageNum++; }
}
var arrayPageScroll = document.viewport.getScrollOffsets();
var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
var lightboxLeft = arrayPageScroll[0];
this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();
this.changeImage(imageNum);
},
changeImage: function(imageNum) {	  
this.activeImage = imageNum;
if (LightboxOptions.animate) this.loading.show();
this.lightboxImage.hide();
this.hoverNav.hide();
this.prevLink.hide();
this.nextLink.hide();
this.imageDataContainer.setStyle({opacity: .0001});
this.numberDisplay.hide();
var imgPreloader = new Image();
imgPreloader.onload = (function(){
  this.lightboxImage.src = this.imageArray[this.activeImage][0];
  this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
}).bind(this);
imgPreloader.src = this.imageArray[this.activeImage][0];
},
resizeImageContainer: function(imgWidth, imgHeight) {
var widthCurrent  = this.outerImageContainer.getWidth();
var heightCurrent = this.outerImageContainer.getHeight();
var widthNew  = (imgWidth  + LightboxOptions.borderSize * 2);
var heightNew = (imgHeight + LightboxOptions.borderSize * 2);
var xScale = (widthNew  / widthCurrent)  * 100;
var yScale = (heightNew / heightCurrent) * 100;
var wDiff = widthCurrent - widthNew;
var hDiff = heightCurrent - heightNew;
if (hDiff != 0) new Effect.Scale(this.outerImageContainer, yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'}); 
if (wDiff != 0) new Effect.Scale(this.outerImageContainer, xScale, {scaleY: false, duration: this.resizeDuration, delay: this.resizeDuration}); 
var timeout = 0;
if ((hDiff == 0) && (wDiff == 0)){
  timeout = 100;
  if (Prototype.Browser.IE) timeout = 250;   
}

(function(){
  this.prevLink.setStyle({ height: imgHeight + 'px' });
  this.nextLink.setStyle({ height: imgHeight + 'px' });
  this.imageDataContainer.setStyle({ width: widthNew + 'px' });
  this.showImage();
}).bind(this).delay(timeout / 1000);
},
showImage: function(){
this.loading.hide();
new Effect.Appear(this.lightboxImage, { 
  duration: this.resizeDuration, 
  queue: 'end', 
  afterFinish: (function(){ this.updateDetails(); }).bind(this) 
});
this.preloadNeighborImages();
},
updateDetails: function() {
if (this.imageArray[this.activeImage][1] != ""){
  this.caption.update(this.imageArray[this.activeImage][1]).show();
}
if (this.imageArray.length > 1){
  this.numberDisplay.update( LightboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + '  ' + this.imageArray.length).show();
}
new Effect.Parallel(
  [ 
	  new Effect.SlideDown(this.imageDataContainer, { sync: true, duration: this.resizeDuration, from: 0.0, to: 1.0 }), 
	  new Effect.Appear(this.imageDataContainer, { sync: true, duration: this.resizeDuration }) 
  ], 
  { 
	  duration: this.resizeDuration, 
	  afterFinish: (function() {
		  var arrayPageSize = this.getPageSize();
		  this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
		  this.updateNav();
	  }).bind(this)
  } 
);
},
updateNav: function() {
this.hoverNav.show();			   
if (this.activeImage > 0) this.prevLink.show();
if (this.activeImage < (this.imageArray.length - 1)) this.nextLink.show();

this.enableKeyboardNav();
},
enableKeyboardNav: function() {
document.observe('keydown', this.keyboardAction); 
},
disableKeyboardNav: function() {
document.stopObserving('keydown', this.keyboardAction); 
},
keyboardAction: function(event) {
var keycode = event.keyCode;

var escapeKey;
if (event.DOM_VK_ESCAPE) {
  escapeKey = event.DOM_VK_ESCAPE;
} else {
  escapeKey = 27;
}

var key = String.fromCharCode(keycode).toLowerCase();

if (key.match(/x|o|c/) || (keycode == escapeKey)){
  this.end();
} else if ((key == 'p') || (keycode == 37)){
  if (this.activeImage != 0){
	  this.disableKeyboardNav();
	  this.changeImage(this.activeImage - 1);
  }
} else if ((key == 'n') || (keycode == 39)){
  if (this.activeImage != (this.imageArray.length - 1)){
	  this.disableKeyboardNav();
	  this.changeImage(this.activeImage + 1);
  }
}
},
preloadNeighborImages: function(){
var preloadNextImage, preloadPrevImage;
if (this.imageArray.length > this.activeImage + 1){
  preloadNextImage = new Image();
  preloadNextImage.src = this.imageArray[this.activeImage + 1][0];
}
if (this.activeImage > 0){
  preloadPrevImage = new Image();
  preloadPrevImage.src = this.imageArray[this.activeImage - 1][0];
}
},
end: function() {
this.disableKeyboardNav();
this.lightbox.hide();
new Effect.Fade(this.overlay, { duration: this.overlayDuration });
$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'visible' });
},
getPageSize: function() { 
var xScroll, yScroll;
if (window.innerHeight && window.scrollMaxY) {	
  xScroll = window.innerWidth + window.scrollMaxX;
  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) {
  if(document.documentElement.clientWidth){
	  windowWidth = document.documentElement.clientWidth; 
  } else {
	  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 = xScroll;		
} else {
  pageWidth = windowWidth;
}
return [pageWidth,pageHeight];
}
}
document.observe('dom:loaded', function () { new Lightbox(); });