var Lightbox = {
init: function(options){
	this.options = Object.extend({
		resizeDuration: 400,
		resizeTransition: Fx.Transitions.sineInOut,
		initialWidth: 250,
		initialHeight: 250,
		animateCaption: {In:true,Out:true},
		container: document.body,
		showControls: false,
		showNumbers: true,
		descriptions: false,
		opacity: 0.8
	}, 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(this.options.container);
	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(this.options.container);
	this.image = new Element('div').setProperty('id', 'lbImage').injectInside(this.center);
	this.bottomContainer = new Element('div').setProperty('id', 'lbBottomContainer').setStyle('display', 'none').injectInside(this.options.container);
	this.bottom = new Element('div').setProperty('id', 'lbBottom').injectInside(this.bottomContainer);
	if(this.options.showControls){
		this.controlDiv = new Element('div').setProperty('id','lbControls').injectInside(this.bottom);
	}else{
		this.controlDiv = this.image;
	}
	this.prevLink = new Element('a').setProperties({id: 'lbPrevLink', href: '#'}).setStyle('display', 'none').injectInside(this.controlDiv);
	this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.controlDiv);
	this.prevLink.onclick = this.previous.bind(this);
	this.nextLink.onclick = this.next.bind(this);
	this.closeButton = new Element('a').setProperties({id: 'lbCloseLink', href: '#'}).injectInside(this.bottom)
	this.closeButton.onclick = this.overlay.onclick = this.close.bind(this);
	this.caption = new Element('div').setProperty('id', 'lbCaption').injectInside(this.bottom);
	if(this.options.descriptions != false){
		this.options.descriptions = $$(this.options.descriptions);
		this.description = new Element('div').setProperty('id', 'lbDescription').injectInside(this.bottom);
	}
	if(this.options.showNumbers){
		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){
	this.options.descriptions.each(function(el,i){
		if(el.hasClass(link.id)){ this.linkLoc = i; }
	},this);
	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.window = {};
	this.window.height = window.getScrollHeight();
	this.window.width = window.getScrollWidth();
	this.window.top = window.getScrollTop();
	this.window.left = window.getScrollLeft();
	this.center.setStyles({top: this.top+'px', display: ''});
	this.fx.overlay.start(this.options.opacity);
	return this.changeImage(imageNum);
},
position: function(){ 
	if(this.options.container == document.body){ 
		var h = window.getScrollHeight()+'px'; 
		var w = window.getScrollWidth()+'px';
		this.overlay.setStyles({top: '0px', height: h, width: w}); 
	}else{ 
		var myCoords = this.options.container.getCoordinates(); 
		this.overlay.setStyles({
			top: myCoords.top+'px', 
			height: myCoords.height+'px', 
			left: myCoords.left+'px', 
			width: myCoords.width+'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(){
	this.linkLoc --;
	return this.changeImage(this.activeImage-1);
},
next: function(){
	this.linkLoc ++;
	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;
	if(this.options.animateCaption.In && this.bottom.offsetHeight){
		this.prevLink.style.display = this.nextLink.style.display = 'none';
		this.bottom.effect('margin-top', {duration: 300, onComplete: this.loadImage.bind(this)}).start(-this.bottom.offsetHeight);
	}else{
		this.bottomContainer.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none';
		this.loadImage();
	}
	this.fx.image.hide();
	this.center.className = 'lbLoading';
	
	return false;
},
loadImage: function(){
	this.preload = new Image();
	this.preload.onload = this.nextEffect.bind(this);
	this.preload.src = this.images[this.activeImage][0];
},
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';
		if(this.options.showControls){
			this.image.style.height = this.preload.height+'px';
		}else{
			this.image.style.height = this.prevLink.style.height = this.nextLink.style.height = this.preload.height+'px';
		}
		this.caption.setHTML(this.images[this.activeImage][1] || '');
		if(this.options.descriptions != false){
			if(this.description.getFirst()){this.description.getFirst().remove()};
			var cl = this.options.descriptions[this.linkLoc].clone();
			cl.setStyle('display', 'block').injectInside(this.description);
		}
		if(this.options.showNumbers){
			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);
		var extra = this.caption.getStyle('height').toInt();
		if(this.options.descriptions != false){extra += this.description.getStyle('height').toInt()}
		if(this.options.showControls){extra += this.controlDiv.getStyle('height').toInt()}
		if(this.options.showNumbers){extra += this.number.getStyle('height').toInt()}
		var num = (extra-(this.closeButton.getStyle('height').toInt()*2));
		if(num < 0){num=0}
		this.closeButton.setStyle('marginTop', num+'px');
		if(this.activeImage != 0) this.prevLink.style.display = '';
		if(this.activeImage != (this.images.length - 1)) this.nextLink.style.display = '';
		break;
	case 4:
		if (this.options.animateCaption.Out){
			this.fx.bottom.set(-this.bottom.offsetHeight);
			this.bottomContainer.style.height = '';
			this.fx.bottom.start(0);
			break;
		}
		this.bottomContainer.style.height = '';
	case 5:
		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);
		this.overlay.setStyles({height: this.window.height+'px', width: this.window.width+'px'});
		return false;
	}
};