// -----------------------------------------------------------------------------------
    //
    //   Lightbox v2.04.01
    //   by Lokesh Dhakar - http://www.lokeshdhakar.com
    //   Last Modification: 2/9/08
    //   Last Modification: 6/21/10 RAK (added vertical offset option)
    //
    //   For more information, visit:
    //   http://lokeshdhakar.com/projects/lightbox2/
    //
    //   Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
    //      - Free for use in both personal and commercial projects
    //      - Attribution requires leaving author name, author link, and the license info intact.
    //
    //   Thanks: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas Fuchs(mir.aculo.us) for ideas, libs, and snippets.
    //         Artemy Tregubenko (arty.name) for cleanup and help in updating to latest ver of proto-aculous.
    //
    // -----------------------------------------------------------------------------------
    /*

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

       Lightbox Class Declaration
       - initialize()
       - updateImageList()
       - start()
       - changeImage()
       - resizeImageContainer()
       - showImage()
       - updateDetails()
       - updateNav()
       - enableKeyboardNav()
       - disableKeyboardNav()
       - keyboardAction()
       - preloadNeighborImages()
       - end()

       Function Calls
       - document.observe()

    */
    // -----------------------------------------------------------------------------------
    //
    //   Configurationl
    //
    LightboxOptions = Object.extend({
       fileLoadingImage:       './js/lightbox/images/loading.gif',
       //fileBottomNavCloseImage: './images/closelabel.gif',

       overlayOpacity: 0.8,   // controls transparency of shadow overlay

       animate: true,         // toggles resizing animations
       resizeSpeed: 7,         // controls the speed of the image resizing animations (1=slowest and 10=fastest)

       borderSize: 10,         //if you adjust the padding in the CSS, you will need to update this variable

       // When grouping images this is used to write: Image # of #.
       // Change it for non-english localization
       labelImage: "",
       labelOf: "/",

       offsetTop: 32   // offset from top of screen in pixels

    }, window.LightboxOptions || {});

    // -----------------------------------------------------------------------------------

    var Lightbox = Class.create();

    Lightbox.prototype = {
       imageArray: [],
       activeImage: undefined,

       // initialize()
       // Constructor runs on completion of the DOM loading. Calls updateImageList and then
       // the function inserts html at the bottom of the page which is used to display the shadow
       // overlay and the image container.
       //
       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;  // shadow fade in/out duration

          // When Lightbox starts it will resize itself from 250 by 250 to the current image dimension.
          // If animations are turned off, it will be hidden as to prevent a flicker of a
          // white 250 by 250 box.
          var size = (LightboxOptions.animate ? 250 : 1) + 'px';


          // Code inserts html at the bottom of the page that looks similar to this:
          //
          //   <div id="overlay"></div>
          //   <div id="lightbox">
          //      <div id="outerImageContainer">
          //         <div id="imageContainer">
          //            <img id="lightboxImage">
          //            <div style="" id="hoverNav">
          //               <a href="#" id="prevLink"></a>
          //               <a href="#" id="nextLink"></a>
          //            </div>
          //            <div id="loading">
          //               <a href="#" id="loadingLink">
          //                  <img src="images/loading.gif">
          //               </a>
          //            </div>
          //         </div>
          //      </div>
          //      <div id="imageDataContainer">
          //         <div id="imageData">
          //            <div id="imageDetails">
          //               <span id="caption"></span>
          //               <span id="numberDisplay"></span>
          //            </div>
          //            <div id="bottomNav">
          //               <a href="#" id="bottomNavClose">
          //                  <img src="images/close.gif">
          //               </a>
          //            </div>
          //         </div>
          //      </div>
          //   </div>


          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()
       // Loops through anchor tags looking for 'lightbox' references and applies onclick
       // events to appropriate links. You can rerun after dynamically adding images w/ajax.
       //
       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()
       //   Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
       //
       start: function(imageLink) {

          $$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });

          // stretch overlay to fill page and fade in
          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')){
             // if image is NOT part of a set, add single image to imageArray
             this.imageArray.push([imageLink.href, imageLink.title]);
          } else {
             // if image is part of a set..
             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++; }
          }

          // calculate top and left offset for the lightbox
          var arrayPageScroll = document.viewport.getScrollOffsets();
       //   var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
          var lightboxTop = arrayPageScroll[1] + LightboxOptions.offsetTop;
          var lightboxLeft = arrayPageScroll[0];
          this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();

          this.changeImage(imageNum);
       },

       //
       //   changeImage()
       //   Hide most elements and preload image in preparation for resizing image container.
       //
       changeImage: function(imageNum) {

          this.activeImage = imageNum; // update global var

          // hide elements during transition
          if (LightboxOptions.animate) this.loading.show();
          this.lightboxImage.hide();
          this.hoverNav.hide();
          this.prevLink.hide();
          this.nextLink.hide();
          // HACK: Opera9 does not currently support scriptaculous opacity and appear fx
          this.imageDataContainer.setStyle({opacity: .0001});
          this.numberDisplay.hide();

          var imgPreloader = new Image();

          // once image is preloaded, resize image container


          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()
       //
       resizeImageContainer: function(imgWidth, imgHeight) {

          // get current width and height
          var widthCurrent  = this.outerImageContainer.getWidth();
          var heightCurrent = this.outerImageContainer.getHeight();

          // get new width and height
          var widthNew  = (imgWidth  + LightboxOptions.borderSize * 2);
          var heightNew = (imgHeight + LightboxOptions.borderSize * 2);

          // scalars based on change from old to new
          var xScale = (widthNew   / widthCurrent)    * 100;
          var yScale = (heightNew / heightCurrent) * 100;

          // calculate size difference between new and old image, and resize if necessary
          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});

          // if new and old image are same size and no scaling transition is necessary,
          // do a quick pause to prevent image flicker.
          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()
       //   Display image and begin preloading neighbors.
       //
       showImage: function(){
          this.loading.hide();
          new Effect.Appear(this.lightboxImage, {
             duration: this.resizeDuration,
             queue: 'end',
             afterFinish: (function(){ this.updateDetails(); }).bind(this)
          });
          this.preloadNeighborImages();
       },

       //
       //   updateDetails()
       //   Display caption, image number, and bottom nav.
       //
       updateDetails: function() {

          // if caption is not null
          if (this.imageArray[this.activeImage][1] != ""){
             this.caption.update(this.imageArray[this.activeImage][1]).show();
          }

          // if image is part of set display 'Image x of x'
          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() {
                   // update overlay size and update nav
                   var arrayPageSize = this.getPageSize();
                   this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
                   this.updateNav();
                }).bind(this)
             }
          );
       },

       //
       //   updateNav()
       //   Display appropriate previous and next hover navigation.
       //
       updateNav: function() {

          this.hoverNav.show();

          // if not first image in set, display prev image button
          if (this.activeImage > 0) this.prevLink.show();

          // if not last image in set, display next image button
          if (this.activeImage < (this.imageArray.length - 1)) this.nextLink.show();

          this.enableKeyboardNav();
       },

       //
       //   enableKeyboardNav()
       //
       enableKeyboardNav: function() {
          document.observe('keydown', this.keyboardAction);
       },

       //
       //   disableKeyboardNav()
       //
       disableKeyboardNav: function() {
          document.stopObserving('keydown', this.keyboardAction);
       },

       //
       //   keyboardAction()
       //
       keyboardAction: function(event) {
          var keycode = event.keyCode;

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

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

          if (key.match(/x|o|c/) || (keycode == escapeKey)){ // close lightbox
             this.end();
          } else if ((key == 'p') || (keycode == 37)){ // display previous image
             if (this.activeImage != 0){
                this.disableKeyboardNav();
                this.changeImage(this.activeImage - 1);
             }
          } else if ((key == 'n') || (keycode == 39)){ // display next image
             if (this.activeImage != (this.imageArray.length - 1)){
                this.disableKeyboardNav();
                this.changeImage(this.activeImage + 1);
             }
          }
       },

       //
       //   preloadNeighborImages()
       //   Preload previous and next images.
       //
       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()
       //
       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()
       //
       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){ // 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
             if(document.documentElement.clientWidth){
                windowWidth = document.documentElement.clientWidth;
             } else {
                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 = xScroll;
          } else {
             pageWidth = windowWidth;
          }

          return [pageWidth,pageHeight];
       }
    }

    document.observe('dom:loaded', function () { new Lightbox(); });