var Lightbox={
init: function(options){this.options=$extend({resizeDuration: 400,
resizeTransition: false,
initialWidth: 250,
initialHeight: 250,
animateCaption: true,
showCounter: true
}, options ||{});
this.anchors=[];
$each(document.links, function(el){if (el.rel && el.rel.test(/^lightbox/i)){el.onclick=this.click.pass(el, this);
this.anchors.push(el);}}, this);
this.eventKeyDown=this.keyboardListener.bindAsEventListener(this);
this.eventPosition=this.position.bind(this);
this.overlay=new Element('div',{'id':'lbOverlay'}).injectInside(document.body);
this.center=new Element('div',{'id':'lbCenter', 'styles':{'width': this.options.initialWidth, 'height': this.options.initialHeight, 'marginLeft': -(this.options.initialWidth/2), 'display':'none'}}).injectInside(document.body);
this.image=new Element('div',{'id':'lbImage'}).injectInside(this.center);
this.prevLink=new Element('a',{'id':'lbPrevLink', 'href':'#', 'styles':{'display':'none'}}).injectInside(this.image);
this.nextLink=this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.image);
this.prevLink.onclick=this.previous.bind(this);
this.nextLink.onclick=this.next.bind(this);
this.bottomContainer=new Element('div',{'id':'lbBottomContainer', 'styles':{'display':'none'}}).injectInside(document.body);
this.bottom=new Element('div',{'id':'lbBottom'}).injectInside(this.bottomContainer);
new Element('a',{'id':'lbCloseLink', 'href':'#'}).injectInside(this.bottom).onclick=this.overlay.onclick=this.close.bind(this);
this.caption=new Element('div',{'id':'lbCaption'}).injectInside(this.bottom);
this.number=new Element('div',{'id':'lbNumber'}).injectInside(this.bottom);
new Element('div',{'styles':{'clear':'both'}}).injectInside(this.bottom);
var nextEffect=this.nextEffect.bind(this);
this.fx={overlay: this.overlay.effect('opacity',{duration: 500}).hide(),
resize: this.center.effects($extend({duration: this.options.resizeDuration, onComplete: nextEffect}, this.options.resizeTransition ?{transition: this.options.resizeTransition} :{})),
image: this.image.effect('opacity',{duration: 500, onComplete: nextEffect}),
bottom: this.bottom.effect('margin-top',{duration: 400, onComplete: nextEffect})
};
this.preloadPrev=new Image();
this.preloadNext=new Image();},
click: function(link){if (link.rel.length==8) return this.show(link.href, link.title);
var j, imageNum, images=[];
this.anchors.each(function(el){if (el.rel==link.rel){for (j=0;j < images.length;j++) if(images[j][0]==el.href) break;
if (j==images.length){images.push([el.href, el.title]);
if (el.href==link.href) imageNum=j;}}}, this);
return this.open(images, imageNum);},
show: function(url, title){return this.open([[url, title]], 0);},
open: function(images, imageNum){this.images=images;
this.position();
this.setup(true);
this.top=window.getScrollTop()+(window.getHeight() / 15);
this.center.setStyles({top: this.top, display:''});
this.fx.overlay.start(0.8);
return this.changeImage(imageNum);},
position: function(){this.overlay.setStyles({'top': window.getScrollTop(), 'height': window.getHeight()});},
setup: function(open){var elements=$A(document.getElementsByTagName('object'));
elements.extend(document.getElementsByTagName(window.ie ? 'select' :'embed'));
elements.each(function(el){if (open) el.lbBackupStyle=el.style.visibility;
el.style.visibility=open ? 'hidden' : el.lbBackupStyle;});
var fn=open ? 'addEvent' :'removeEvent';
window[fn]('scroll', this.eventPosition)[fn]('resize', this.eventPosition);
document[fn]('keydown', this.eventKeyDown);
this.step=0;},
keyboardListener: function(event){switch (event.keyCode){case 27: case 88: case 67: this.close();break;
case 37: case 80: this.previous();break;
case 39: case 78: this.next();}},
previous: function(){return this.changeImage(this.activeImage-1);},
next: function(){return this.changeImage(this.activeImage+1);},
changeImage: function(imageNum){if (this.step||(imageNum < 0)||(imageNum >=this.images.length)) return false;
this.step=1;
this.activeImage=imageNum;
this.center.style.backgroundColor='';
this.bottomContainer.style.display=this.prevLink.style.display=this.nextLink.style.display='none';
this.fx.image.hide();
this.center.className='lbLoading';
this.preload=new Image();
this.preload.onload=this.nextEffect.bind(this);
this.preload.src=this.images[imageNum][0];
return false;},
nextEffect: function(){switch (this.step++){case 1:
this.center.className='';
this.image.style.backgroundImage='url('+this.images[this.activeImage][0]+')';
this.image.style.width=this.bottom.style.width=this.preload.width+'px';
this.image.style.height=this.prevLink.style.height=this.nextLink.style.height=this.preload.height+'px';
this.caption.setHTML(this.images[this.activeImage][1]||'');
this.number.setHTML((!this.options.showCounter||(this.images.length==1)) ? '' :'Image '+(this.activeImage+1)+' of '+this.images.length);
if (this.activeImage) this.preloadPrev.src=this.images[this.activeImage-1][0];
if (this.activeImage !=(this.images.length - 1)) this.preloadNext.src=this.images[this.activeImage+1][0];
if (this.center.clientHeight !=this.image.offsetHeight){this.fx.resize.start({height: this.image.offsetHeight});
break;}
this.step++;
case 2:
if (this.center.clientWidth !=this.image.offsetWidth){this.fx.resize.start({width: this.image.offsetWidth, marginLeft: -this.image.offsetWidth/2});
break;}
this.step++;
case 3:
this.bottomContainer.setStyles({top: this.top+this.center.clientHeight, height: 0, marginLeft: this.center.style.marginLeft, display:''});
this.fx.image.start(1);
break;
case 4:
this.center.style.backgroundColor='#000';
if (this.options.animateCaption){this.fx.bottom.set(-this.bottom.offsetHeight);
this.bottomContainer.style.height='';
this.fx.bottom.start(0);
break;}
this.bottomContainer.style.height='';
case 5:
if (this.activeImage) this.prevLink.style.display='';
if (this.activeImage !=(this.images.length - 1)) this.nextLink.style.display='';
this.step=0;}},
close: function(){if (this.step < 0) return;
this.step=-1;
if (this.preload){this.preload.onload=Class.empty;
this.preload=null;}
for (var f in this.fx) this.fx[f].stop();
this.center.style.display=this.bottomContainer.style.display='none';
this.fx.overlay.chain(this.setup.pass(false, this)).start(0);
return false;}};
window.addEvent('domready', Lightbox.init.bind(Lightbox));