var Lightbox={maxWidth:screen.width-100,maxHeight:screen.height-100,defaultIframeWidth:screen.width-500,defaultIframeHeight:screen.height-500,init:function(options){this.options=Object.extend({resizeDuration:400,resizeTransition:Fx.Transitions.sineInOut,initialWidth:250,initialHeight:250,animateCaption: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').setProperty('id','lbOverlay').injectInside(document.body);this.center=new Element('div').setProperty('id','lbCenter').setStyles({width:this.options.initialWidth+'px',height:this.options.initialHeight+'px',marginLeft:'-'+(this.options.initialWidth/2)+'px',display:'none'}).injectInside(document.body);this.image=new Element('div').setProperty('id','lbImage').injectInside(this.center);this.prevLink=new Element('a').setProperties({id:'lbPrevLink',href:'#'}).setStyle('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').setProperty('id','lbBottomContainer').setStyle('display','none').injectInside(document.body);this.bottom=new Element('div').setProperty('id','lbBottom').injectInside(this.bottomContainer);new Element('a').setProperties({id:'lbCloseLink',href:'#'}).injectInside(this.bottom).onclick=this.overlay.onclick=this.close.bind(this);this.caption=new Element('div').setProperty('id','lbCaption').injectInside(this.bottom);this.number=new Element('div').setProperty('id','lbNumber').injectInside(this.bottom);new Element('div').setStyle('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({duration:this.options.resizeDuration,transition:this.options.resizeTransition,onComplete:nextEffect}),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+'px',display:''});this.fx.overlay.start(0.8);return this.changeImage(imageNum);},position:function(){this.overlay.setStyles({top:window.getScrollTop()+'px',height:window.getHeight()+'px'});},setup:function(open){var elements=$A(document.getElementsByTagName('object'));if(window.ie)elements.extend(document.getElementsByTagName('select'));elements.each(function(el){el.style.visibility=open?'hidden':'';});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.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(){if(this.preload.width>this.maxWidth){this.preload.width=this.maxWidth-500;}else{if(this.preload.height>this.maxHeight){this.preload.width='';}else{this.preload.width=this.preload.width;}}
if(this.preload.height>this.maxHeight){this.preload.height=this.maxHeight-500;}else{if(this.preload.width>this.maxWidth){this.preload.height='';}else{this.preload.height=this.preload.height;}}
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.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)+'px',height:'0px',marginLeft:this.center.style.marginLeft,display:''});this.fx.image.start(1);break;case 4: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));