/**
Script: Slideshow.js
   Slideshow - A javascript class for Mootools to stream and animate the presentation of images on your website.

License:
   MIT-style license.

Copyright:
   Copyright (c) 2008 [Aeron Glemann](http://www.electricprism.com/aeron/).

Dependencies:
   Mootools 1.2 Core: Fx.Morph, Fx.Tween, Selectors, Element.Dimensions.
   Mootools 1.2 More: Assets.
*/

Slideshow = new Class({
   Implements: [Chain, Events, Options],
   
   options: {
      captions: false,
      center: true,
      classes: [],
      controller: false,
      delay: 2000,
      duration: 750,
      fast: false,
      height: false,
      href: '',
      hu: '',
      linked: false,
//    loader: {'animate': ['css/loader-#.png', 12]},
      loop: true,
      match: /\?slide=(\d+)$/,
      /*
      onComplete: $empty,
      onEnd: $empty,
      onStart: $empty,
      */
      overlap: true,
      paused: false,
      random: false,
      replace: [/(\.[^\.]+)$/, 't$1'],
      resize: 'width',
      slide: 0,
      thumbnails: false,
      transition: function(p){return -(Math.cos(Math.PI * p) - 1) / 2;},
      width: false
   },
   
/**
Constructor: initialize
   Creates an instance of the Slideshow class.
   
Arguments:
   element - (element) The wrapper element.
   data - (array or object) The images and optional thumbnails, captions and links for the show.
   options - (object) The options below.
   
Syntax:
   var myShow = new Slideshow(element, data, options);
*/

   initialize: function(el, data, options){  
      this.setOptions(options);
      this.slideshow = $(el);
      if (!this.slideshow) 
         return;
      this.slideshow.set('styles', {'display': 'block', 'position': 'relative', 'z-index': 0});
      var match = window.location.href.match(this.options.match);
      this.slide = (this.options.match && match) ? match[1].toInt() : this.options.slide;
      this.counter = this.delay = this.transition = 0;
      this.direction = 'left';
      this.paused = false;
      if (!this.options.overlap)
         this.options.duration *= 2;
      var anchor = this.slideshow.getElement('a') || new Element('a');
      if (!this.options.href)
         this.options.href = anchor.get('href') || '';
      if (this.options.hu.length && !this.options.hu.test(/\/$/)) 
         this.options.hu += '/';
         
      // styles
      
      var keys = ['slideshow', 'first', 'prev', 'play', 'pause', 'next', 'last', 'images', 'captions', 'controller', 'thumbnails', 'hidden', 'visible', 'inactive', 'active', 'loader'];
      var values = keys.map(function(key, i){
         return this.options.classes[i] || key;
      }, this);
      this.classes = values.associate(keys);
      this.classes.get = function(){
         var str = '.' + this.slideshow;
         for (var i = 0, l = arguments.length; i < l; i++)
            str += ('-' + this[arguments[i]]);
         return str;
      }.bind(this.classes);
         
      // data  
         
      if (!data){
         this.options.hu = '';
         data = {};
         var thumbnails = this.slideshow.getElements(this.classes.get('thumbnails') + ' img');
         this.slideshow.getElements(this.classes.get('images') + ' img').each(function(img, i){
            var src = img.get('src');
            var caption = img.get('alt') || img.get('title') || '';
            var href = img.getParent().get('href') || '';
            var thumbnail = thumbnails[i].get('src') || '';
            data[src] = {'caption': caption, 'href': href, 'thumbnail': thumbnail};
         });
      }
      var loaded = this.load(data);
      if (!loaded)
         return; 
      
      // events
      
      this.events = $H({'keydown': [], 'keyup': [], 'mousemove': []});
      var keyup = function(e){
         switch(e.key){
            case 'left': 
               this.prev(e.shift); break;
            case 'right': 
               this.next(e.shift); break;
            case 'p': 
               this.pause(); break;
         }
      }.bind(this);     
      this.events.keyup.push(keyup);
      document.addEvent('keyup', keyup);

      // required elements
         
      var el = this.slideshow.getElement(this.classes.get('images'));
      var images = (el) ? el.empty() : new Element('div', {'class': this.classes.get('images').substr(1)}).inject(this.slideshow);
      var div = images.getSize();
      this.height = this.options.height || div.y;     
      this.width = this.options.width || div.x;
      images.set({'styles': {'display': 'block', 'height': this.height, 'overflow': 'hidden', 'position': 'relative', 'width': this.width}});
      this.slideshow.store('images', images);
      this.a = this.image = this.slideshow.getElement('img') || new Element('img');
      this.a.set('styles', {'display': 'none', 'position': 'absolute', 'zIndex': 1});
      this.b = this.a.clone();
      [this.a, this.b].each(function(img){
         anchor.clone().grab(img).inject(images);
      });
      
      // optional elements
      
      if (this.options.captions)
         this._captions();
      if (this.options.controller)
         this._controller();
      if (this.options.loader)
         this._loader();
      if (this.options.thumbnails)
         this._thumbnails();
         
      // begin show
      
      this._preload();
   },
   
/**
Public method: go
   Jump directly to a slide in the show.

Arguments:
   n - (integer) The index number of the image to jump to, 0 being the first image in the show.
   
Syntax:
   myShow.go(n);  
*/

   go: function(n, direction){
      if ((this.slide - 1 + this.data.images.length) % this.data.images.length == n || $time() < this.transition)
         return;     
      $clear(this.timer);
      this.delay = 0;      
      this.direction = (direction) ? direction : ((n < this.slide) ? 'right' : 'left');
      this.slide = n;
      if (this.preloader) 
         this.preloader = this.preloader.destroy();
      this._preload(this.options.fast || this.paused);
   },

/**
Public method: first
   Goes to the first image in the show.

Syntax:
   myShow.first();   
*/

   first: function(){
      this.prev(true); 
   },

/**
Public method: prev
   Goes to the previous image in the show.

Syntax:
   myShow.prev(); 
*/

   prev: function(first){
      var n = 0;
      if (!first){
         if (this.options.random){
            
            // if it's a random show get the previous slide from the showed array

            if (this.showed.i < 2)
               return;
            this.showed.i -= 2;
            n = this.showed.array[this.showed.i];
         }
         else
            n = (this.slide - 2 + this.data.images.length) % this.data.images.length;                          
      }
      this.go(n, 'right');
   },

/**
Public method: pause
   Toggles play / pause state of the show.

Arguments:
   p - (undefined, 1 or 0) Call pause with no arguments to toggle the pause state. Call pause(1) to force pause, or pause(0) to force play.

Syntax:
   myShow.pause(p);  
*/

   pause: function(p){
      if ($chk(p))
         this.paused = (p) ? false : true;
      if (this.paused){
         this.paused = false;
         this.delay = this.transition = 0;      
         this.timer = this._preload.delay(100, this);
         [this.a, this.b].each(function(img){
            ['morph', 'tween'].each(function(p){
               if (this.retrieve(p)) this.get(p).resume();
            }, img);
         });
         if (this.options.controller)
            this.slideshow.getElement('.' + this.classes.pause).removeClass(this.classes.play);
      } 
      else {
         this.paused = true;
         this.delay = Number.MAX_VALUE;
         this.transition = 0;
         $clear(this.timer);
         [this.a, this.b].each(function(img){
            ['morph', 'tween'].each(function(p){
               if (this.retrieve(p)) this.get(p).pause();
            }, img);
         });
         if (this.options.controller)
            this.slideshow.getElement('.' + this.classes.pause).addClass(this.classes.play);
      }
   },
   
/**
Public method: next
   Goes to the next image in the show.

Syntax:
   myShow.next(); 
*/

   next: function(last){
      var n = (last) ? this.data.images.length - 1 : this.slide;
      this.go(n, 'left');
   },

/**
Public method: last
   Goes to the last image in the show.

Syntax:
   myShow.last(); 
*/

   last: function(){
      this.next(true); 
   },

/**
Public method: load
   Loads a new data set into the show: will stop the current show, rewind and rebuild thumbnails if applicable.

Arguments:
   data - (array or object) The images and optional thumbnails, captions and links for the show.

Syntax:
   myShow.load(data);
*/

   load: function(data){
      this.firstrun = true;
      this.showed = {'array': [], 'i': 0};
      if ($type(data) == 'array'){
         this.options.captions = false;         
         data = new Array(data.length).associate(data.map(function(image, i){ return image + '?' + i })); 
      }
      this.data = {'images': [], 'captions': [], 'hrefs': [], 'thumbnails': []};
      for (image in data){
         var obj = data[image] || {};
         var caption = (obj.caption) ? obj.caption.trim() : '';
         var href = (obj.href) ? obj.href.trim() : ((this.options.linked) ? this.options.hu + image : this.options.href);
         var thumbnail = (obj.thumbnail) ? obj.thumbnail.trim() : image.replace(this.options.replace[0], this.options.replace[1]);
         this.data.images.push(image);
         this.data.captions.push(caption);
         this.data.hrefs.push(href);
         this.data.thumbnails.push(thumbnail);
      }
      
      // only run when data is loaded dynamically into an existing slideshow instance
      
      if (this.options.thumbnails && this.slideshow.retrieve('thumbnails'))
         this._thumbnails();
      if (this.slideshow.retrieve('images')){
         [this.a, this.b].each(function(img){
            ['morph', 'tween'].each(function(p){
               if (this.retrieve(p)) this.get(p).cancel();
            }, img);
         });
         this.slide = this.transition = 0;
         this.go(0);    
      }
      return this.data.images.length;
   },
   
/**
Public method: destroy
   Destroys a Slideshow instance.

Arguments:
   p - (string) The images and optional thumbnails, captions and links for the show.

Syntax:
   myShow.destroy(p);
*/

   destroy: function(p){
      this.events.each(function(array, e){
         array.each(function(fn){ document.removeEvent(e, fn); });
      });
      this.pause(1);
      if (this.options.loader)
         $clear(this.slideshow.retrieve('loader').retrieve('timer'));      
      if (this.options.thumbnails)
         $clear(this.slideshow.retrieve('thumbnails').retrieve('timer'));
      this.slideshow.uid = Native.UID++;
      if (p)
         this.slideshow[p]();
   },
   
/**
Private method: preload
   Preloads the next slide in the show, once loaded triggers the show, updates captions, thumbnails, etc.
*/

   _preload: function(fast){
      if (!this.preloader)
         this.preloader = new Asset.image(this.options.hu + this.data.images[this.slide], {'onload': function(){
            this.store('loaded', true);
         }});  
      if (this.preloader.retrieve('loaded') && $time() > this.delay && $time() > this.transition){
         if (this.stopped){
            if (this.options.captions)
               this.slideshow.retrieve('captions').get('morph').cancel().start(this.classes.get('captions', 'hidden'));
            this.pause(1);
            if (this.end)
               this.fireEvent('end');
            this.stopped = this.end = false;
            return;           
         }              
         this.image = (this.counter % 2) ? this.b : this.a;
         this.image.set('styles', {'display': 'block', 'height': 'auto', 'visibility': 'hidden', 'width': 'auto', 'zIndex': this.counter});
         ['src', 'height', 'width'].each(function(prop){
            this.image.set(prop, this.preloader.get(prop));
         }, this);
         this._resize(this.image);
         this._center(this.image);
         var anchor = this.image.getParent();
         if (this.data.hrefs[this.slide])
            anchor.set('href', this.data.hrefs[this.slide]);         
         else
            anchor.erase('href');
         if (this.data.captions[this.slide])
            anchor.set('title', this.data.captions[this.slide].replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, "'"));
         else
            anchor.erase('title');
         if (this.options.loader)
            this.slideshow.retrieve('loader').fireEvent('hide');
         if (this.options.captions)
            this.slideshow.retrieve('captions').fireEvent('update', fast);          
         if (this.options.thumbnails)
            this.slideshow.retrieve('thumbnails').fireEvent('update', fast);        
         this._show(fast);
         this._loaded();
      } 
      else {
         if ($time() > this.delay && this.options.loader)
            this.slideshow.retrieve('loader').fireEvent('show');
         this.timer = (this.paused && this.preloader.retrieve('loaded')) ? null : this._preload.delay(100, this, fast); 
      }
   },

/**
Private method: show
   Does the slideshow effect.
*/

   _show: function(fast){
      if (!this.image.retrieve('morph')){
         var options = (this.options.overlap) ? {'duration': this.options.duration, 'link': 'cancel'} : {'duration': this.options.duration / 2, 'link': 'chain'};
         $$(this.a, this.b).set('morph', $merge(options, {'onStart': this._start.bind(this), 'onComplete': this._complete.bind(this), 'transition': this.options.transition}));
      }
      var hidden = this.classes.get('images', ((this.direction == 'left') ? 'next' : 'prev'));
      var visible = this.classes.get('images', 'visible');
      var img = (this.counter % 2) ? this.a : this.b;
      if (fast){        
         img.get('morph').cancel().set(hidden);
         this.image.get('morph').cancel().set(visible);        
      } 
      else {
         if (this.options.overlap){ 
            img.get('morph').set(visible);
            this.image.get('morph').set(hidden).start(visible);
         } 
         else  {
            var fn = function(hidden, visible){
               this.image.get('morph').set(hidden).start(visible);
            }.pass([hidden, visible], this);
            hidden = this.classes.get('images', ((this.direction == 'left') ? 'prev' : 'next'));
            img.get('morph').set(visible).start(hidden).chain(fn);
         }
      }
   },
   
/**
Private method: loaded
   Run after the current image has been loaded, sets up the next image to be shown.
*/

   _loaded: function(){
      this.counter++;
      this.delay = (this.paused) ? Number.MAX_VALUE : $time() + this.options.duration + this.options.delay;
      this.direction = 'left';
      this.transition = (this.paused || this.options.fast) ? 0 : $time() + this.options.duration;        
      if (this.slide + 1 == this.data.images.length && !this.options.loop && !this.options.random)
         this.stopped = this.end = true;        
      if (this.options.random){
         this.showed.i++;
         if (this.showed.i >= this.showed.array.length){
            var n = this.slide;
            if (this.showed.array.getLast() != n) this.showed.array.push(n);
            while (this.slide == n)
               this.slide = $random(0, this.data.images.length - 1);          
         }
         else
            this.slide = this.showed.array[this.showed.i];
      }
      else
         this.slide = (this.slide + 1) % this.data.images.length;
      if (this.preloader) 
         this.preloader = this.preloader.destroy();
      this._preload();
   },

/**
Private method: center
   Center an image.
*/

   _center: function(img){
      if (this.options.center){
         var size = img.getSize();
         img.set('styles', {'left': (size.x - this.width) / -2, 'top': (size.y - this.height) / -2});
      }
   },

/**
Private method: resize
   Resizes an image.
*/

   _resize: function(img){
      if (this.options.resize){
         var h = this.preloader.get('height'), w = this.preloader.get('width');
         var dh = this.height / h, dw = this.width / w, d;
         if (this.options.resize == 'length')
            d = (dh > dw) ? dw : dh;
         else
            d = (dh > dw) ? dh : dw;
         img.set('styles', {height: Math.ceil(h * d), width: Math.ceil(w * d)});
      }  
   },

/**
Private method: start
   Callback on start of slide change.
*/

   _start: function(){     
      this.fireEvent('start');
   },

/**
Private method: complete
   Callback on start of slide change.
*/

   _complete: function(){
      if (this.firstrun && this.options.paused){
         this.firstrun = false;
         this.pause(1);
      }
      this.fireEvent('complete');
   },

/**
Private method: captions
   Builds the optional caption element, adds interactivity.
   This method can safely be removed if the captions option is not enabled.
*/

   _captions: function(){
      if (this.options.captions === true) 
         this.options.captions = {};
      var el = this.slideshow.getElement(this.classes.get('captions'));
      var captions = (el) ? el.empty() : new Element('div', {'class': this.classes.get('captions').substr(1)}).inject(this.slideshow);
      captions.set({
         'events': {
            'update': function(fast){  
               var captions = this.slideshow.retrieve('captions');
               var empty = (this.data.captions[this.slide] === '');
               if (fast){
                  var p = (empty) ? 'hidden' : 'visible';
                  captions.set('html', this.data.captions[this.slide]).get('morph').cancel().set(this.classes.get('captions', p));
               }
               else {
                  var fn = (empty) ? $empty : function(n){
                     this.slideshow.retrieve('captions').set('html', this.data.captions[n]).morph(this.classes.get('captions', 'visible'))
                  }.pass(this.slide, this);     
                  captions.get('morph').cancel().start(this.classes.get('captions', 'hidden')).chain(fn);
               }
            }.bind(this)
         },
         'morph': $merge(this.options.captions, {'link': 'chain'})
      });
      this.slideshow.store('captions', captions);
   },

/**
Private method: controller
   Builds the optional controller element, adds interactivity.
   This method can safely be removed if the controller option is not enabled.
*/

   _controller: function(){
      if (this.options.controller === true)
         this.options.controller = {};
      var el = this.slideshow.getElement(this.classes.get('controller'));
      var controller = (el) ? el.empty() : new Element('div', {'class': this.classes.get('controller').substr(1)}).inject(this.slideshow);
      var ul = new Element('ul').inject(controller);
      $H({'first': 'Shift + Leftwards Arrow', 'prev': 'Leftwards Arrow', 'pause': 'P', 'next': 'Rightwards Arrow', 'last': 'Shift + Rightwards Arrow'}).each(function(accesskey, action){
         var li = new Element('li', {
            'class': (action == 'pause' && this.options.paused) ? this.classes.play + ' ' + this.classes[action] : this.classes[action]
         }).inject(ul);
         var a = this.slideshow.retrieve(action, new Element('a', {
            'title': ((action == 'pause') ? this.classes.play.capitalize() + ' / ' : '') + this.classes[action].capitalize() + ' [' + accesskey + ']'          
         }).inject(li));
         a.set('events', {
            'click': function(action){this[action]();}.pass(action, this),
            'mouseenter': function(active){this.addClass(active);}.pass(this.classes.active, a),
            'mouseleave': function(active){this.removeClass(active);}.pass(this.classes.active, a)
         });      
      }, this);
      controller.set({
         'events': {
            'hide': function(hidden){  
               if (!this.retrieve('hidden'))
                  this.store('hidden', true).morph(hidden);
            }.pass(this.classes.get('controller', 'hidden'), controller),
            'show': function(visible){  
               if (this.retrieve('hidden'))
                  this.store('hidden', false).morph(visible);
            }.pass(this.classes.get('controller', 'visible'), controller)
         },
         'morph': $merge(this.options.controller, {'link': 'cancel'})
      }).store('hidden', false);
      var keydown = function(e){
         if (['left', 'right', 'p'].contains(e.key)){
            var controller = this.slideshow.retrieve('controller');
            if (controller.retrieve('hidden'))
               controller.get('morph').set(this.classes.get('controller', 'visible'));          
            switch(e.key){
               case 'left': 
                  this.slideshow.retrieve((e.shift) ? 'first' : 'prev').fireEvent('mouseenter'); break;
               case 'right':
                  this.slideshow.retrieve((e.shift) ? 'last' : 'next').fireEvent('mouseenter'); break;
               default:
                  this.slideshow.retrieve('pause').fireEvent('mouseenter'); break;
            }
         }
      }.bind(this);
      this.events.keydown.push(keydown);
      var keyup = function(e){
         if (['left', 'right', 'p'].contains(e.key)){
            var controller = this.slideshow.retrieve('controller');
            if (controller.retrieve('hidden'))
               controller.store('hidden', false).fireEvent('hide'); 
            switch(e.key){
               case 'left': 
                  this.slideshow.retrieve((e.shift) ? 'first' : 'prev').fireEvent('mouseleave'); break;
               case 'right': 
                  this.slideshow.retrieve((e.shift) ? 'last' : 'next').fireEvent('mouseleave'); break;
               default:
                  this.slideshow.retrieve('pause').fireEvent('mouseleave'); break;
            }
         }
      }.bind(this);
      this.events.keyup.push(keyup);
      var mousemove = function(e){
         var images = this.slideshow.retrieve('images').getCoordinates();
         if (e.page.x > images.left && e.page.x < images.right && e.page.y > images.top && e.page.y < images.bottom)
            this.slideshow.retrieve('controller').fireEvent('show');
         else
            this.slideshow.retrieve('controller').fireEvent('hide');
      }.bind(this);
      this.events.mousemove.push(mousemove);
      document.addEvents({'keydown': keydown, 'keyup': keyup, 'mousemove': mousemove});
      this.slideshow.retrieve('controller', controller).fireEvent('hide');
   },

/**
Private method: loader
   Builds the optional loader element, adds interactivity.
   This method can safely be removed if the loader option is not enabled.
*/

   _loader: function(){
      if (this.options.loader === true) 
         this.options.loader = {};
      var loader = new Element('div', {
         'class': this.classes.get('loader').substr(1),           
         'morph': $merge(this.options.loader, {'link': 'cancel'})
      }).store('hidden', false).store('i', 1).inject(this.slideshow.retrieve('images'));
      if (this.options.loader.animate){
         for (var i = 0; i < this.options.loader.animate[1]; i++)
            img = new Asset.image(this.options.loader.animate[0].replace(/#/, i));
         if (Browser.Engine.trident4 && this.options.loader.animate[0].contains('png'))
            loader.setStyle('backgroundImage', 'none');              
      }
      loader.set('events', {
         'animate': function(){  
            var loader = this.slideshow.retrieve('loader');          
            var i = (loader.retrieve('i').toInt() + 1) % this.options.loader.animate[1];
            loader.store('i', i);
            var img = this.options.loader.animate[0].replace(/#/, i);
            if (Browser.Engine.trident4 && this.options.loader.animate[0].contains('png'))
               loader.style.filter = 'progid:DXImageTransform.Microsoft.AlphaImageLoader(src="' + img + '", sizingMethod="scale")';
            else 
               loader.setStyle('backgroundImage', 'url(' + img + ')');
         }.bind(this),
         'hide': function(){  
            var loader = this.slideshow.retrieve('loader');
            if (!loader.retrieve('hidden')){
               loader.store('hidden', true).morph(this.classes.get('loader', 'hidden'));
               if (this.options.loader.animate)
                  $clear(loader.retrieve('timer'));               
            }
         }.bind(this),
         'show': function(){  
            var loader = this.slideshow.retrieve('loader');
            if (loader.retrieve('hidden')){
               loader.store('hidden', false).morph(this.classes.get('loader', 'visible'));
               if (this.options.loader.animate)
                  loader.store('timer', function(){this.fireEvent('animate');}.periodical(50, loader));
            }
         }.bind(this)
      });
      this.slideshow.retrieve('loader', loader).fireEvent('hide');
   },
   
/**
Private method: thumbnails
   Builds the optional thumbnails element, adds interactivity.
   This method can safely be removed if the thumbnails option is not enabled.
*/

   _thumbnails: function(){
      if (this.options.thumbnails === true) 
         this.options.thumbnails = {}; 
      var el = this.slideshow.getElement(this.classes.get('thumbnails'));
      var thumbnails = (el) ? el.empty() : new Element('div', {'class': this.classes.get('thumbnails').substr(1)}).inject(this.slideshow);
      thumbnails.setStyle('overflow', 'hidden');
      var ul = new Element('ul', {'tween': {'link': 'cancel'}}).inject(thumbnails);
      this.data.thumbnails.each(function(thumbnail, i){
         var li = new Element('li').inject(ul);
         var a = new Element('a', {
            'events': {
               'click': function(i){
                  this.go(i); 
                  return false; 
               }.pass(i, this),
               'loaded': function(){
                  this.data.thumbnails.pop();
                  if (!this.data.thumbnails.length){
                     var div = thumbnails.getCoordinates();
                     var props = thumbnails.retrieve('props');       
                     var limit = 0, pos = props[1], size = props[2];    
                     thumbnails.getElements('li').each(function(li){       
                        var li = li.getCoordinates();    
                        if (li[pos] > limit) limit = li[pos];
                     }, this);         
                     thumbnails.store('limit', div[size] + div[props[0]] - limit);
                  }
               }.bind(this)
            },
            'href': this.options.hu + this.data.images[i],
            'morph': $merge(this.options.thumbnails, {'link': 'cancel'}),
            'title': this.data.captions[i]
         }).inject(li);
         var img = new Asset.image(this.options.hu + thumbnail, {
            'onload': function(){this.fireEvent('loaded');}.bind(a) 
         }).inject(a);
      }, this);
      thumbnails.set('events', {
         'scroll': function(n, fast){
            var div = this.getCoordinates();
            var ul = this.getElement('ul').getPosition();
            var props = this.retrieve('props');
            var axis = props[3], delta, pos = props[0], size = props[2], value;           
            var tween = this.getElement('ul').get('tween', {'property': pos});   
            if ($chk(n)){
               var li = this.getElements('li')[n].getCoordinates();
               delta = div[pos] + (div[size] / 2) - (li[size] / 2) - li[pos]  
               value = (ul[axis] - div[pos] + delta).limit(this.retrieve('limit'), 0);
               if (fast)   
                  tween.set(value);
               else                  
                  tween.start(value);
            }
            else{
               var area = div[props[2]] / 3, page = this.retrieve('page'), velocity = -0.2;        
               if (page[axis] < (div[pos] + area))
                  delta = (page[axis] - div[pos] - area) * velocity;
               else if (page[axis] > (div[pos] + div[size] - area))
                  delta = (page[axis] - div[pos] - div[size] + area) * velocity;       
               if (delta){       
                  value = (ul[axis] - div[pos] + delta).limit(this.retrieve('limit'), 0);
                  tween.set(value);
               }
            }           
         }.bind(thumbnails),
         'update': function(fast){
            var thumbnails = this.slideshow.retrieve('thumbnails');
            thumbnails.getElements('a').each(function(a, i){   
               if (i == this.slide){
                  if (!a.retrieve('active', false)){
                     a.store('active', true);
                     var active = this.classes.get('thumbnails', 'active');                     
                     if (fast) a.get('morph').set(active);
                     else a.morph(active);
                  }
               } 
               else {
                  if (a.retrieve('active', true)){
                     a.store('active', false);
                     var inactive = this.classes.get('thumbnails', 'inactive');                 
                     if (fast) a.get('morph').set(inactive);
                     else a.morph(inactive);
                  }
               }
            }, this);
            if (!thumbnails.retrieve('mouseover'))
               thumbnails.fireEvent('scroll', [this.slide, fast]);
         }.bind(this)
      })
      var div = thumbnails.getCoordinates();
      thumbnails.store('props', (div.height > div.width) ? ['top', 'bottom', 'height', 'y'] : ['left', 'right', 'width', 'x']);
      var mousemove = function(e){
         var div = this.getCoordinates();
         if (e.page.x > div.left && e.page.x < div.right && e.page.y > div.top && e.page.y < div.bottom){
            this.store('page', e.page);         
            if (!this.retrieve('mouseover')){
               this.store('mouseover', true);
               this.store('timer', function(){this.fireEvent('scroll');}.periodical(50, this));
            }
         }
         else {
            if (this.retrieve('mouseover')){
               this.store('mouseover', false);           
               $clear(this.retrieve('timer'));
            }
         }
      }.bind(thumbnails);
      this.events.mousemove.push(mousemove);
      document.addEvent('mousemove', mousemove);
      this.slideshow.store('thumbnails', thumbnails);
   }
});