// lightbox_plus.js
// == written by Takuya Otani <takuya.otani@gmail.com> ===
// == Copyright (C) 2006 SimpleBoxes/SerendipityNZ Ltd. ==
/*
  Copyright (C) 2006 Takuya Otani/SimpleBoxes - http://serennz.cool.ne.jp/sb/
  Copyright (C) 2006 SerendipityNZ - http://serennz.cool.ne.jp/snz/
  
  This script is licensed under the Creative Commons Attribution 2.5 License
  http://creativecommons.org/licenses/by/2.5/
  
  basically, do anything you want, just leave my name and link.
*/
/*
  Original script : Lightbox JS : Fullsize Image Overlays
  Copyright (C) 2005 Lokesh Dhakar - http://www.huddletogether.com
  For more information on this script, visit:
  http://huddletogether.com/projects/lightbox/
*/
// ver. 20090729 - fixed a bug ( lightbox may not be closed properly )
// ver. 20090709 - fixed a bug ( loading image is not shown properly )
// ver. 20090707 - implemented animation feature
// ver. 20090318 - fixed a bug ( prev/next are not shown in some occasions )
// ver. 20061027 - fixed a bug ( not work at xhtml documents on Netscape7 )
// ver. 20061026 - fixed bugs
// ver. 20061010 - implemented image set feature
// ver. 20060921 - fixed a bug / added overall view
// ver. 20060920 - added flag to prevent mouse wheel event
// ver. 20060919 - fixed a bug
// ver. 20060918 - implemented functionality of wheel zoom & drag'n drop
// ver. 20060131 - fixed a bug to work correctly on Internet Explorer for Windows
// ver. 20060128 - implemented functionality of echoic word
// ver. 20060120 - implemented functionality of caption and close button
// === elements ===
document.getElemetsByClassName = function(name,target)
{
  var result = [];
  var object  = null;
  var search = new RegExp(['(^|\\s)',name,'(\\s|$)'].join(''));
  if (target && target.getElementsByTagName)
    object = target.getElementsByTagName('*');
  if (!object)
    object = document.getElementsByTagName ? document.getElementsByTagName('*') : document.all;
  for (var i=0,n=object.length;i<n;i++)
  {
    var check = object[i].getAttribute('class') || object[i].className;
    if (check.match(search)) result.push(object[i]);
  }
  return result;
}
// === window ===
function WindowSize()
{ // window size object
  this.w = 0;
  this.h = 0;
  return this;
}
WindowSize.prototype.update = function()
{
  var d = document;
  var w = 
    (window.innerWidth) ? window.innerWidth
  : (d.documentElement && d.documentElement.clientWidth) ? d.documentElement.clientWidth
  : d.body.clientWidth;
  var h = 
    (window.innerHeight) ? window.innerHeight
  : (d.documentElement && d.documentElement.clientHeight) ? d.documentElement.clientHeight
  : d.body.clientHeight;
  if (w != this.w || h != this.h)
  {
    this.w = w;
    this.h = h;
    return true;
  }
  return false;
};
function PageSize()
{ // page size object
  this.win = new WindowSize();
  this.w = 0;
  this.h = 0;
  return this;
}
PageSize.prototype.update = function()
{
  var d = document;
  var w = 
    (window.innerWidth && window.scrollMaxX) ? window.innerWidth + window.scrollMaxX
  : (d.body.scrollWidth > d.body.offsetWidth) ? d.body.scrollWidth
  : d.body.offsetWidt;
  var h = 
    (window.innerHeight && window.scrollMaxY) ? window.innerHeight + window.scrollMaxY
  : (d.body.scrollHeight > d.body.offsetHeight) ? d.body.scrollHeight
  : d.body.offsetHeight;
  var updated = this.win.update();
  if (w < this.win.w) w = this.win.w;
  if (h < this.win.h) h = this.win.h;
  if (updated || w != this.w || h != this.h)
  {
    this.w = w;
    this.h = h;
    return true;
  }
  return false;
};
function PagePos()
{ // page position object
  this.x = 0;
  this.y = 0;
  return this;
}
PagePos.prototype.update = function()
{
  var d = document;
  var x =
    (window.pageXOffset) ? window.pageXOffset
  : (d.documentElement && d.documentElement.scrollLeft) ? d.documentElement.scrollLeft
  : (d.body) ? d.body.scrollLeft
  : 0;
  var y =
    (window.pageYOffset) ? window.pageYOffset
  : (d.documentElement && d.documentElement.scrollTop) ? d.documentElement.scrollTop
  : (d.body) ? d.body.scrollTop
  : 0;
  if (x != this.x || y != this.y)
  {
    this.x = x;
    this.y = y;
    return true;
  }
  return false;
};
// === browser ===
if ( !window.Spica )
{
  var Spica = {};
  Spica.Browser = new function()
  {
    this.name = navigator.userAgent;
    this.isWinIE = this.isMacIE = false;
    this.isGecko = this.name.match(/Gecko\//);
    this.isSafari = this.name.match(/AppleWebKit/);
    this.isSafari3 = (this.name.match(/AppleWebKit\/(\d\d\d)/) && parseInt(RegExp.$1) > 500);
    this.isKHTML = this.isSafari || navigator.appVersion.match(/Konqueror|KHTML/);
    this.isOpera = window.opera;
    if (document.all && !this.isGecko && !this.isSafari && !this.isOpera)
    {
      this.isWinIE = this.name.match(/Win/);
      this.isMacIE = this.name.match(/Mac/);
      this.isNewIE = (this.name.match(/MSIE (\d\.\d)/) && RegExp.$1 > 6.5);
    }
  };
  Spica.Event = {
    cache : false,
    getEvent : function(evnt)
    {
      return (evnt) ? evnt : ((window.event) ? window.event : null);
    },
    getKey : function(evnt)
    {
      if (!evnt) return; // do nothing
      return (evnt.keyCode) ? evnt.keyCode : evnt.charCode;
    },
    stop : function(evnt)
    {
      if (!evnt) return; // do nothing
      try
      {
        evnt.stopPropagation();
      }
      catch(err) {};
      evnt.cancelBubble = true;
      try
      {
        evnt.preventDefault();
      }
      catch(err) {};
      return (evnt.returnValue = false);
    },
    register : function(object, type, handler)
    {
      if (!object) return;
      if (type == 'keypress' && !object.addEventListener) type = 'keydown';
      if (type == 'mousewheel' && Spica.Browser.isGecko) type = 'DOMMouseScroll';
      if (!this.cache) this.cache = [];
      if (object.addEventListener)
      {
        this.cache.push([object,type,handler]);
        object.addEventListener(type, handler, false);
      }
      else if (object.attachEvent)
      {
        this.cache.push([object,type,handler]);
        object.attachEvent('on' + type,handler);
      }
      else
      {
        object['on' + type] = handler;
      }
    },
    deregister : function(object, type, handler)
    {
      if (!object) return;
      if (type == 'keypress' && !object.addEventListener) type = 'keydown';
      if (type == 'mousewheel' && Spica.Browser.isGecko) type = 'DOMMouseScroll';
      if (object.removeEventListener)
        object.removeEventListener(type, handler, false);
      else if (object.detachEvent)
        object.detachEvent('on' + type, handler);
      else
        object['on' + type] = null;
    },
    deregisterAll : function()
    {
      if (!Spica.Event.cache) return
      for (var i=0,n=Spica.Event.cache.length;i<n;i++)
      {
        Spica.Event.deregister(Spica.Event.cache[i]);
        Spica.Event.cache[i][0] = null;
      }
      Spica.Event.cache = false;
    },
    run : function(func)
    {
      if (typeof func != 'function') return;
      (Spica.Browser.isGecko || Spica.Browser.isOpera)
        ? this.register(window,'DOMContentLoaded',func)
        : this.register(window,'load',func);
    }
  };
  Spica.Event.register(window, 'unload', Spica.Event.deregisterAll);
} // end of if ( !window.Spica )
// === lightbox ===
function Lightbox(option)
{
  var self = this;
  self._imgs = new Array();
  self._sets = new Array();
  self._wrap = null;
  self._box  = null;
  self._img  = null;
  self._open = -1;
  self._page = new PageSize();
  self._pos  = new PagePos();
  self._zoomimg = null;
  self._expandable = false;
  self._expanded = false;
  self._funcs = {'move':null,'up':null,'drag':null,'wheel':null,'dbl':null};
  self._level = 1;
  self._curpos = {x:0,y:0};
  self._imgpos = {x:0,y:0};
  self._minpos = {x:0,y:0};
  self._expand = option.expandimg;
  self._shrink = option.shrinkimg;
  self._blank = option.blankimg;
  self._resizable = option.resizable;
  self._timer = null;
  self._anim = {step:0, w:50, h:50, a:0, t:0, f:option.animation};
  self._indicator = null;
  self._overall = null;
  self._openedset = null;
  self._prev = null;
  self._next = null;
  self._hiding = [];
  self._first = false;
  self._changed = false;
  return self._init(option);
}
Lightbox.prototype = {
  refresh : function(target)
  {
    if (!target) target = document;
    this._imgs.length = 0;
    this._genListFromLinks(target);
  },
  _init : function(option)
  {
    var self = this;
    var d = document;
    if (!d.getElementsByTagName) return;
    if (Spica.Browser.isMacIE) return self;
    var body = d.getElementsByTagName("body")[0];
    self._wrap = self._createWrapOn(body);
    self._box  = self._createBoxOn(body,option);
    self._img  = self._box.firstChild;
    self._zoomimg = d.getElementById('actionImage');
    if ( !option.skipInit ) self._genListFromLinks(d);
    return self;
  },
  _genListFromLinks : function(d)
  {
    var self = this;
    var links = d.getElementsByTagName("a");
    for (var i=0;i<links.length;i++)
    {
      var anchor = links[i];
      var num = self._imgs.length;
      var rel = String(anchor.getAttribute("rel")).toLowerCase();
      if (!anchor.getAttribute("href") || !rel.match('lightbox')) continue;
      // initialize item
      self._imgs[num] = {
        src:anchor.getAttribute("href"),
        w:-1,
        h:-1,
        title:'',
        cls:anchor.className,
        set:rel
      };
      if (anchor.getAttribute("title"))
        self._imgs[num].title = anchor.getAttribute("title");
      else if ( anchor.firstChild 
             && anchor.firstChild.getAttribute 
             && anchor.firstChild.getAttribute("title"))
        self._imgs[num].title = anchor.firstChild.getAttribute("title");
      anchor.onclick = self._genOpener(num); // set closure to onclick event
      if (rel != 'lightbox')
      {
        if (!self._sets[rel]) self._sets[rel] = new Array();
        self._sets[rel].push(num);
      }
    }
  },
  _genOpener : function(num)
  {
    var self = this;
    return function() { self._show(num); return false; }
  },
  _createWrapOn : function(obj)
  {
    var self = this;
    if (!obj) return null;
    // create wrapper object, translucent background
    var wrap = document.createElement('div');
    obj.appendChild(wrap);
    wrap.id = 'overlay';
    wrap.style.display = 'none';
    wrap.style.position = 'fixed';
    wrap.style.top = '0px';
    wrap.style.left = '0px';
    wrap.style.zIndex = '50';
    wrap.style.width = '100%';
    wrap.style.height = '100%';
    if (Spica.Browser.isWinIE) wrap.style.position = 'absolute';
    Spica.Event.register(wrap,"click",function(evt) { self._close(evt); });
    return wrap;
  },
  _createBoxOn : function(obj,option)
  {
    var self = this;
    if (!obj) return null;
    // create lightbox object, frame rectangle
    var box = document.createElement('div');
    obj.appendChild(box);
    box.id = 'lightbox';
    box.style.display = 'none';
    box.style.position = 'absolute';
    box.style.zIndex = '60';
    // create image object to display a target image
    var img = document.createElement('img');
    box.appendChild(img);
    img.id = 'lightboxImage';
    img.width = 200;
    img.height = 200;
    self._set_cursor(img);
    Spica.Event.register(img,'mouseover',function() { self._show_action(); });
    Spica.Event.register(img,'mouseout',function() { self._hide_action(); });
    Spica.Event.register(img,'click',function(evt) { self._close(evt); });
    // create loading image, animated image
    var imag = new Image;
    imag.onload = function() {
      var spin = document.createElement('img');
      box.appendChild(spin);
      spin.id = 'loadingImage';
      spin.src = imag.src;
      spin.style.position = 'absolute';
      spin.style.zIndex = '70';
      self._set_cursor(spin);
      Spica.Event.register(spin,'click',function(evt) { self._close(evt); });
      imag.onload = function(){};
    };
    if (option.loadingimg != '') imag.src = option.loadingimg;
    // create hover navi - prev
    if (option.previmg)
    {
      var prevLink = document.createElement('img');
      box.appendChild(prevLink);
      prevLink.id = 'prevLink';
      prevLink.style.display = 'none';
      prevLink.style.position = 'absolute';
      prevLink.style.left = '9px';
      prevLink.style.zIndex = '70';
      prevLink.src = option.previmg;
      self._prev = prevLink;
      Spica.Event.register(prevLink,'mouseover',function() { self._show_action(); });
      Spica.Event.register(prevLink,'click',function() { self._show_next(-1); });
    }
    // create hover navi - next
    if (option.nextimg)
    {
      var nextLink = document.createElement('img');
      box.appendChild(nextLink);
      nextLink.id = 'nextLink';
      nextLink.style.display = 'none';
      nextLink.style.position = 'absolute';
      nextLink.style.right = '9px';
      nextLink.style.zIndex = '70';
      nextLink.src = option.nextimg;
      self._next = nextLink;
      Spica.Event.register(nextLink,'mouseover',function() { self._show_action(); });
      Spica.Event.register(nextLink,'click',function() { self._show_next(+1); });
    }
    // create zoom indicator
    var zoom = document.createElement('img');
    box.appendChild(zoom);
    zoom.id = 'actionImage';
    zoom.style.display = 'none';
    zoom.style.position = 'absolute';
    zoom.style.top = '15px';
    zoom.style.left = '15px';
    zoom.style.zIndex = '70';
    self._set_cursor(zoom);
    zoom.src = self._expand;
    Spica.Event.register(zoom,'mouseover',function() { self._show_action(); });
    Spica.Event.register(zoom,'click', function() { self._zoom(); });
    // create close button
    if (option.closeimg)
    {
      var btn = document.createElement('img');
      box.appendChild(btn);
      btn.id = 'closeButton';
      btn.style.display = 'inline';
      btn.style.position = 'absolute';
      btn.style.right = '9px';
      btn.style.top = '10px';
      btn.style.zIndex = '80';
      btn.src = option.closeimg;
      self._set_cursor(btn);
      Spica.Event.register(btn,'click',function(evt) { self._close(evt); });
    }
    // caption text
    var caption = document.createElement('span');
    box.appendChild(caption);
    caption.id = 'lightboxCaption';
    caption.style.display = 'none';
    caption.style.position = 'absolute';
    caption.style.zIndex = '80';
    // create effect image
    if (!option.effectpos)
      option.effectpos = {x:0,y:0};
    else
    {
      if (option.effectpos.x == '') option.effectpos.x = 0;
      if (option.effectpos.y == '') option.effectpos.y = 0;
    }
    var effect = new Image;
    effect.onload = function()
    {
      var effectImg = document.createElement('img');
      box.appendChild(effectImg);
      effectImg.id = 'effectImage';
      effectImg.src = effect.src;
      if (option.effectclass) effectImg.className = option.effectclass;
      effectImg.style.position = 'absolute';
      effectImg.style.display = 'none';
      effectImg.style.left = [option.effectpos.x,'px'].join('');;
      effectImg.style.top = [option.effectpos.y,'px'].join('');
      effectImg.style.zIndex = '90';
      self._set_cursor(effectImg);
      Spica.Event.register(effectImg,'click',function() { effectImg.style.display = 'none'; });
    };
    if (option.effectimg != '') effect.src = option.effectimg;
    if (self._resizable)
    {
      var overall = document.createElement('div');
      obj.appendChild(overall);
      overall.id = 'lightboxOverallView';
      overall.style.display = 'none';
      overall.style.position = 'absolute';
      overall.style.zIndex = '70';
      self._overall = overall;
      var indicator = document.createElement('div');
      obj.appendChild(indicator);
      indicator.id = 'lightboxIndicator';
      indicator.style.display = 'none';
      indicator.style.position = 'absolute';
      indicator.style.zIndex = '80';
      self._indicator = indicator;
    }
    return box;
  },
  _set_photo_size : function()
  {
    var self = this;
    if (self._open == -1) return;
    var targ = { w:self._page.win.w - 30, h:self._page.win.h - 30 };
    var zoom = { x:15, y:15 };
    var navi = { p:9, n:9, y:0 };
    if (!self._expanded)
    { // shrink image with the same aspect
      var orig = { w:self._imgs[self._open].w, h:self._imgs[self._open].h };
      if ( orig.w < 0 ) orig.w = self._img.width;
      if ( orig.h < 0 ) orig.h = self._img.height;
      var ratio = 1.0;
      if ((orig.w >= targ.w || orig.h >= targ.h) && orig.h && orig.w)
        ratio = ((targ.w / orig.w) < (targ.h / orig.h)) ? targ.w / orig.w : targ.h / orig.h;
      self._expandable = (ratio < 1.0) ? true : false;
      self._anim.w = Math.floor(orig.w * ratio);
      self._anim.h = Math.floor(orig.h * ratio);
      if (self._resizable) self._expandable = true;
      if (Spica.Browser.isWinIE) self._box.style.display = "block";
      self._imgpos.x = self._pos.x + (targ.w - self._img.width) / 2;
      self._imgpos.y = self._pos.y + (targ.h - self._img.height) / 2;
      navi.y = Math.floor(self._img.height / 2) - 10;
      self._show_overall(false);
      var loading = document.getElementById('loadingImage');
      if (loading)
      {
        loading.style.left = [(self._img.width - 30) / 2,'px'].join('');
        loading.style.top  = [(self._img.height - 30) / 2,'px'].join('');
      }
    }
    else
    { // zoomed or actual sized image
      var width  = parseInt(self._imgs[self._open].w * self._level);
      var height = parseInt(self._imgs[self._open].h * self._level);
      self._minpos.x = self._pos.x + targ.w - self._img.width;
      self._minpos.y = self._pos.y + targ.h - self._img.height;
      if (self._img.width <= targ.w)
        self._imgpos.x = self._pos.x + (targ.w - self._img.width) / 2;
      else
      {
        if (self._imgpos.x > self._pos.x) self._imgpos.x = self._pos.x;
        else if (self._imgpos.x < self._minpos.x) self._imgpos.x = self._minpos.x;
        zoom.x = 15 + self._pos.x - self._imgpos.x;
        navi.p = self._pos.x - self._imgpos.x - 5;
        navi.n = self._img.width - self._page.win.w + self._imgpos.x + 25;
        if (Spica.Browser.isWinIE) navi.n -= 10;
      }
      if (self._img.height <= targ.h)
      {
        self._imgpos.y = self._pos.y + (targ.h - self._img.height) / 2;
        navi.y = Math.floor(self._img.height / 2) - 10;
      }
      else
      {
        if (self._imgpos.y > self._pos.y) self._imgpos.y = self._pos.y;
        else if (self._imgpos.y < self._minpos.y) self._imgpos.y = self._minpos.y;
        zoom.y = 15 + self._pos.y - self._imgpos.y;
        navi.y = Math.floor(targ.h / 2) - 10 + self._pos.y - self._imgpos.y;
      }
      self._anim.w = width;
      self._anim.h = height;
      self._show_overall(true);
    }
    self._box.style.left = [self._imgpos.x,'px'].join('');
    self._box.style.top  = [self._imgpos.y,'px'].join('');
    self._zoomimg.style.left = [zoom.x,'px'].join('');
    self._zoomimg.style.top  = [zoom.y,'px'].join('');
    self._wrap.style.left = self._pos.x;
    if (self._prev && self._next)
    {
      self._prev.style.left  = [navi.p,'px'].join('');
      self._next.style.right = [navi.n,'px'].join('');
      self._prev.style.top = self._next.style.top = [navi.y,'px'].join('');
    }
    self._changed = true;
  },
  _show_overall : function(visible)
  {
    var self = this;
    if (self._overall == null) return;
    if (visible)
    {
      if (self._open == -1) return;
      var base = 100;
      var outer = { w:0, h:0, x:0, y:0 };
      var inner = { w:0, h:0, x:0, y:0 };
      var orig = { w:self._img.width , h:self._img.height };
      var targ = { w:self._page.win.w - 30, h:self._page.win.h - 30 };
      var max = orig.w;
      if (max < orig.h) max = orig.h;
      if (max < targ.w) max = targ.w;
      if (max < targ.h) max = targ.h;
      if (max < 1) return;
      outer.w = parseInt(orig.w / max * base);
      outer.h = parseInt(orig.h / max * base);
      inner.w = parseInt(targ.w / max * base);
      inner.h = parseInt(targ.h / max * base);
      outer.x = self._pos.x + targ.w - base - 20;
      outer.y = self._pos.y + targ.h - base - 20;
      inner.x = outer.x - parseInt((self._imgpos.x - self._pos.x) / max * base);
      inner.y = outer.y - parseInt((self._imgpos.y - self._pos.y) / max * base);
      self._overall.style.left = [outer.x,'px'].join('');
      self._overall.style.top  = [outer.y,'px'].join('');
      self._overall.style.width  = [outer.w,'px'].join('');
      self._overall.style.height = [outer.h,'px'].join('');
      self._indicator.style.left = [inner.x,'px'].join('');
      self._indicator.style.top  = [inner.y,'px'].join('');
      self._indicator.style.width  = [inner.w,'px'].join('');
      self._indicator.style.height = [inner.h,'px'].join('');
      self._overall.style.display = 'block'
      self._indicator.style.display = 'block';
    }
    else
    {
      self._overall.style.display = 'none';
      self._indicator.style.display = 'none';
    }
  },
  _set_size : function(onResize)
  {
    var self = this;
    if (self._open == -1) return;
    if (!self._page.update() && !self._pos.update() && !self._changed) return;
    if (Spica.Browser.isWinIE)
    {
      self._wrap.style.width  = [self._page.win.w,'px'].join('');
      self._wrap.style.height = [self._page.win.h,'px'].join('');
      self._wrap.style.top = [self._pos.y,'px'].join('');
    }
    if (onResize) self._set_photo_size();
  },
  _set_cursor : function(obj)
  {
    var self = this;
    if (Spica.Browser.isWinIE && !Spica.Browser.isNewIE) return;
    obj.style.cursor = 'pointer';
  },
  _current_setindex : function()
  {
    var self = this;
    if (!self._openedset) return -1;
    var list = self._sets[self._openedset];
    for (var i=0,n=list.length;i<n;i++)
    {
      if (list[i] == self._open) return i;
    }
    return -1;
  },
  _get_setlength : function()
  {
    var self = this;
    if (!self._openedset) return -1;
    return self._sets[self._openedset].length;
  },
  _show_action : function()
  {
    var self = this;
    if (self._open == -1) return;
    var check = self._current_setindex();
    if (check > -1)
    {
      if (check > 0) self._prev.style.display = 'inline';
      if (check < self._get_setlength() - 1) self._next.style.display = 'inline';
    }
    if (!self._expandable || !self._zoomimg) return;
    self._zoomimg.src = (self._expanded) ? self._shrink : self._expand;
    self._zoomimg.style.display = 'inline';
  },
  _hide_action : function()
  {
    var self = this;
    if (self._zoomimg) self._zoomimg.style.display = 'none';
    if (self._open > -1 && self._expanded) self._dragstop(null);
    if (self._prev) self._prev.style.display = 'none';
    if (self._next) self._next.style.display = 'none';
  },
  _zoom : function()
  {
    var self = this;
    var closeBtn = document.getElementById('closeButton');
    if (self._expanded)
    {
      self._reset_func();
      self._expanded = false;
      if (closeBtn) closeBtn.style.display = 'inline';
    }
    else if (self._open > -1)
    {
      self._level = 1;
      self._imgpos.x = self._pos.x;
      self._imgpos.y = self._pos.y;
      self._expanded = true;
      self._funcs.drag  = function(evt) { self._dragstart(evt) };
      self._funcs.dbl   = function(evt) { self._close(null) };
      if (self._resizable)
      {
        self._funcs.wheel = function(evt) { self._onwheel(evt) };
        Spica.Event.register(self._box,'mousewheel',self._funcs.wheel);
      }
      Spica.Event.register(self._img,'mousedown',self._funcs.drag);
      Spica.Event.register(self._img,'dblclick',self._funcs.dbl);
      self._show_caption(false);
      if (closeBtn) closeBtn.style.display = 'none';
    }
    self._set_photo_size();
    self._show_action();
  },
  _reset_func : function()
  {
    var self = this;
    if (self._funcs.wheel != null) Spica.Event.deregister(self._box,'mousewheel',self._funcs.wheel);
    if (self._funcs.move  != null) Spica.Event.deregister(self._img,'mousemove',self._funcs.move);
    if (self._funcs.up    != null) Spica.Event.deregister(self._img,'mouseup',self._funcs.up);
    if (self._funcs.drag  != null) Spica.Event.deregister(self._img,'mousedown',self._funcs.drag);
    if (self._funcs.dbl   != null) Spica.Event.deregister(self._img,'dblclick',self._funcs.dbl);
    self._funcs = {'move':null,'up':null,'drag':null,'wheel':null,'dbl':null};
  },
  _onwheel : function(evt)
  {
    var self = this;
    var delta = 0;
    evt = Spica.Event.getEvent(evt);
    if (evt.wheelDelta)  delta = event.wheelDelta/-120;
    else if (evt.detail) delta = evt.detail/3;
    if (Spica.Browser.isOpera) delta = - delta;
    var step =
        (self._level < 1) ? 0.1
      : (self._level < 2) ? 0.25
      : (self._level < 4) ? 0.5
      : 1;
    self._level = (delta > 0) ? self._level + step : self._level - step;
    if (self._level > 8) self._level = 8;
    else if (self._level < 0.5) self._level = 0.5;
    self._set_photo_size();
    return Spica.Event.stop(evt);
  },
  _dragstart : function(evt)
  {
    var self = this;
    evt = Spica.Event.getEvent(evt);
    self._curpos.x = evt.screenX;
    self._curpos.y = evt.screenY;
    self._funcs.move = function(evnt) { self._dragging(evnt); };
    self._funcs.up   = function(evnt) { self._dragstop(evnt); };
    Spica.Event.register(self._img,'mousemove',self._funcs.move);
    Spica.Event.register(self._img,'mouseup',self._funcs.up);
    return Spica.Event.stop(evt);
  },
  _dragging : function(evt)
  {
    var self = this;
    evt = Spica.Event.getEvent(evt);
    self._imgpos.x += evt.screenX - self._curpos.x;
    self._imgpos.y += evt.screenY - self._curpos.y;
    self._curpos.x = evt.screenX;
    self._curpos.y = evt.screenY;
    self._set_photo_size();
    return Spica.Event.stop(evt);
  },
  _dragstop : function(evt)
  {
    var self = this;
    evt = Spica.Event.getEvent(evt);
    if (self._funcs.move  != null) Spica.Event.deregister(self._img,'mousemove',self._funcs.move);
    if (self._funcs.up    != null) Spica.Event.deregister(self._img,'mouseup',self._funcs.up);
    self._funcs.move = null;
    self._funcs.up   = null;
    self._set_photo_size();
    return (evt) ? Spica.Event.stop(evt) : false;
  },
  _show_caption : function(enable)
  {
    var self = this;
    var caption = document.getElementById('lightboxCaption');
    if (!caption) return;
    if (caption.innerHTML.length == 0 || !enable)
    {
      caption.style.display = 'none';
    }
    else
    { // now display caption
      caption.style.top = [self._img.height + 10,'px'].join(''); // 10 is top margin of lightbox
      caption.style.left = '0px';
      caption.style.width = [self._img.width + 20,'px'].join(''); // 20 is total side margin of lightbox
      caption.style.display = 'block';
    }
  },
  _toggle_wrap : function(flag)
  {
    var self = this;
    self._wrap.style.display = flag ? "block" : "none";
    if (self._hiding.length == 0 && !self._first)
    { // some objects may overlap on overlay, so we hide them temporarily.
      var tags = ['select','embed','object'];
      for (var i=0,n=tags.length;i<n;i++)
      {
        var elem = document.getElementsByTagName(tags[i]);
        for (var j=0,m=elem.length;j<m;j++)
        { // check the original value at first. when already hidden, dont touch them
          var check = elem[j].style.visibility;
          if (!check)
          {
            if (elem[j].currentStyle)
              check = elem[j].currentStyle['visibility'];
            else if (document.defaultView)
              check = document.defaultView.getComputedStyle(elem[j],'').getPropertyValue('visibility');
          }
          if (check == 'hidden') continue;
          self._hiding.push(elem[j]);
        }
      }
      self._first = true;
    }
    for (var i=0,n=self._hiding.length;i<n;i++)
      self._hiding[i].style.visibility = flag ? "hidden" : "visible";
    if ( flag )
      self._setOpacity(self._wrap,5);
  },
  _prepare : function(num)
  {
    var self = this;
    if (self._open == -1) return;
    self._set_size(false); // calc and set wrapper size
    self._toggle_wrap(true);
    self._box.style.display = "block";
    self._hide_action();
    self._img.src = self._blank;
    var loading = document.getElementById('loadingImage');
    if (loading) loading.style.display = 'inline';
    var objs = ['effectImage','closeButton','lightboxCaption'];
    for (var i in objs)
    {
      var obj = document.getElementById(objs[i]);
      if (obj) obj.style.display = 'none';
    }
  },
  _show : function(num)
  {
    var self = this;
    var imag = new Image;
    if (num < 0 || num >= self._imgs.length) return;
    self._open = num; // set opened image number
    self._prepare();
    self._set_photo_size();
    imag.onload = function() {
      self._expanded = false;
      if (self._imgs[self._open].w == -1)
      { // store original image width and height
        self._imgs[self._open].w = imag.width;
        self._imgs[self._open].h = imag.height;
      }
      var caption = document.getElementById('lightboxCaption');
      if (caption)
        try { caption.innerHTML = self._imgs[self._open].title; } catch(e) {}
      self._anim.t = (new Date()).getTime();
      self._timer = window.setInterval( function() { self._run() }, 20);
      self._img.setAttribute('title',self._imgs[self._open].title);
      self._anim.step = ( self._anim.f ) ? 0 : 2;
      self._set_photo_size(); // calc and set lightbox size
      if ( !self._anim.f ) // animator is disabled, so apply immediately
        self._show_image();
      if (self._imgs[self._open].set != 'lightbox')
      {
        var set = self._imgs[self._open].set;
        if (self._sets[set].length > 1) self._openedset = set;
        if (!self._prev || !self._next) self._openedset = null;
      }
    };
    self._expandable = false;
    self._expanded = false;
    self._anim.step = -1;
    imag.src = self._imgs[self._open].src;
  },
  _run : function()
  {
    var self = this;
    var t = (new Date()).getTime();
    if ( t - self._anim.t < 50 ) return;
    self._anim.t = t;
    self._set_size(true);
    if ( self._anim.step == 0 || self._anim.w != self._img.width || self._anim.h != self._img.height )
    {
      self._doResizing();
    }
    else if ( self._anim.step == 1 )
    {
      self._doFadeIn();
    }
    else if ( self._anim.step == 3 )
    {
      self._doFadeOut();
    }
  },
  _show_image : function()
  {
    var self = this;
    if (self._open == -1) return;
    self._img.src = self._imgs[self._open].src;
    var loading = document.getElementById('loadingImage');
    if (loading) loading.style.display = 'none';
    var effect = document.getElementById('effectImage');
    if (effect && (!effect.className || self._imgs[self._open].cls == effect.className))
      effect.style.display = 'block';
    var closeBtn = document.getElementById('closeButton');
    if (closeBtn) closeBtn.style.display = 'inline';
    self._show_caption(true);
  },
  _doResizing : function()
  {
    var self = this;
    var diff = {
      x: ( self._anim.f ) ? Math.floor((self._anim.w - self._img.width) / 3) : 0,
      y: ( self._anim.f ) ? Math.floor((self._anim.h - self._img.height) / 3) : 0
    };
    self._img.width += diff.x;
    self._img.height += diff.y;
    if ( Math.abs(diff.x) < 1 ) self._img.width = self._anim.w;
    if ( Math.abs(diff.y) < 1 ) self._img.height = self._anim.h;
    if ( self._anim.w == self._img.width && self._anim.h == self._img.height )
    {
      self._changed = false;
      self._set_photo_size();
      if ( self._anim.step == 0 )
      {
        self._anim.step = 1; // move on the next stage
        self._anim.a = 0;
        self._show_image();
        self._setOpacity(self._img,self._anim.a);
      }
      else if ( self._anim.step == 2 && !self._expanded)
        self._show_caption(true);
    }
  },
  _doFadeIn : function()
  {
    var self = this;
    self._anim.a += 2;
    if ( self._anim.a > 10 )
    {
      self._anim.step = 2; // move on the next stage
      self._anim.a = 9.9;
    }
    self._setOpacity(self._img,self._anim.a);
  },
  _doFadeOut : function()
  {
    var self = this;
    self._anim.a -= 1;
    if ( self._anim.a < 1 )
    {
      self._anim.step = 2; // finish
      self._anim.a = 0;
      if ( self._timer != null )
      {
        window.clearInterval(self._timer);
        self._timer = null;
      }
      self._toggle_wrap(false);
    }
    self._setOpacity(self._wrap,self._anim.a);
  },
  _setOpacity : function(elem, alpha)
  {
    if (Spica.Browser.isWinIE)
      elem.style.filter = 'alpha(opacity=' + (alpha * 10) + ')';
    else
      elem.style.opacity = alpha / 10;
  },
  _close_box : function()
  {
    var self = this;
    self._open = -1;
    self._openedset = null;
    self._hide_action();
    self._reset_func();
    self._show_overall(false);
    self._box.style.display  = "none";
    if ( !self._anim.f && self._timer != null )
    {
      window.clearInterval(self._timer);
      self._timer = null;
    }
  },
  _show_next : function(direction)
  {
    var self = this;
    if (!self._openedset) return self._close(null);
    var index = self._current_setindex() + direction;
    var targ = self._sets[self._openedset][index];
    self._close_box();
    self._show(targ);
  },
  _close : function(evt)
  {
    var self = this;
    if (evt != null)
    {
      evt = Spica.Event.getEvent(evt);
      var targ = evt.target || evt.srcElement;
      if (targ && targ.getAttribute('id') == 'lightboxImage' && self._expanded) return;
    }
    self._close_box();
    if ( self._anim.f && self._anim.step == 2 )
    {
      self._anim.step = 3;
      self._anim.a = 5;
    }
    else
    {
      self._toggle_wrap(false);
    }
  }
};
Spica.Event.run(function() { 
  var lightbox = new Lightbox({
    loadingimg:'lightbox_plus/loading.gif',
    expandimg:'lightbox_plus/expand.gif',
    shrinkimg:'lightbox_plus/shrink.gif',
    blankimg:'lightbox_plus/blank.gif',
    previmg:'lightbox_plus/prev.gif',
    nextimg:'lightbox_plus/next.gif',
    closeimg:'lightbox_plus/close.gif',
    effectimg:'lightbox_plus/zzoop.gif',
    effectpos:{x:-40,y:-20},
    effectclass:'effectable',
    resizable:true,
    animation:true
  });
});