/*
	Slimbox v1.3 - The ultimate lightweight Lightbox clone
	by Christophe Beyls (http://www.digitalia.be) - MIT-style license.
	Inspired by the original Lightbox v2 by Lokesh Dhakar.
*/
var Lightbox = {
	init: function(options){this.options = Object.extend({rD: 400,rT: Fx.Transitions.sineInOut,iW: 250,iH: 250,aC: 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.iW+'px', height: this.options.iH+'px', marginLeft: '-'+(this.options.iW/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 nE = this.nE.bind(this);
		this.fx = {
			overlay: this.overlay.effect('opacity', {duration: 500}).hide(),
			resize: this.center.effects({duration: this.options.rD, transition: this.options.rT, onComplete: nE}),
			image: this.image.effect('opacity', {duration: 500, onComplete: nE}),
			bottom: this.bottom.effect('margin-top', {duration: 400, onComplete: nE})};
		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.nE.bind(this);
		this.preload.src = this.images[imageNum][0];
		return false;},
	nE: 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) ? '' : '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.aC){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));