var Lightbox={init:function(_1){this.options=Object.extend({resizeDuration:400,resizeTransition:Fx.Transitions.sineInOut,initialWidth:250,initialHeight:250,animateCaption:true},_1||{});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 _3=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:_3}),image:this.image.effect("opacity",{duration:500,onComplete:_3}),bottom:this.bottom.effect("margin-top",{duration:400,onComplete:_3})};this.preloadPrev=new Image();this.preloadNext=new Image();},click:function(_4){if(_4.rel.length==8){return this.show(_4.href,_4.title);}var j,imageNum,images=[];this.anchors.each(function(el){if(el.rel==_4.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==_4.href){imageNum=j;}}}},this);return this.open(images,imageNum);},show:function(_7,_8){return this.open([[_7,_8]],0);},open:function(_9,_a){this.images=_9;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(_a);},position:function(){this.overlay.setStyles({top:window.getScrollTop()+"px",height:window.getHeight()+"px"});},setup:function(_b){var _c=$A(document.getElementsByTagName("object"));if(window.ie){_c.extend(document.getElementsByTagName("select"));}_c.each(function(el){el.style.visibility=_b?"hidden":"";});var fn=_b?"addEvent":"removeEvent";window[fn]("scroll",this.eventPosition)[fn]("resize",this.eventPosition);document[fn]("keydown",this.eventKeyDown);this.step=0;},keyboardListener:function(_f){switch(_f.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(_10){if(this.step||(_10<0)||(_10>=this.images.length)){return false;}this.step=1;this.activeImage=_10;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[_10][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.images.length==1)?"":"Immagine "+(this.activeImage+1)+" di "+this.images.length+".<br>Per sfogliare le foto clicca in alto a destra e sinistra, oppure premi ALT+N / ALT+P.");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));