var pt_cycle = Class.create({
	initialize: function(element,options) {
		this.options = Object.extend({
			prev: null,
			next: null,
			lazy: false,
			lazy_q: 2,
			speed: 1,
			timeout: 5000,
			pause: 1,
			rotate: true
		}, options || {});
		this.currSlide = 0;
		this.lastSlide = 0;
		this.nextSlide = 0;
		this.busy = false;
		this.randomIndex = 0;
		this.timer = null;
		this.container = $(element);
		this.items = this.container.childElements();
		this.total = this.items.length;
		this.set_style();
		try{this.items[0].show();}catch(e){};
		if(this.total > 1){
			if(this.lazyLoad()){
				this.buildEvents();
				this.startup();
			}
		}
		this.paused = false;
	},
	set_style: function(){
		this.items.each(function(el){
			el.setStyle({
				position: 'absolute',
				top: '0px',
				left: '0px'
			});
			el.hide();
		});
		this.container.setStyle({position: 'relative'});
	},
	buildEvents: function(){
		if(this.options.prev != null)
			$(this.options.prev).observe('click',this.prev_click.bind(this));
		if(this.options.next != null)
			$(this.options.next).observe('click',this.next_click.bind(this));
		if(this.options.pause == 1){
			this.container.observe('mouseover', this.pause.bind(this));
			this.container.observe('mouseout', this.unpause.bind(this));
		}
	},
	pause: function(e){
		this.paused = true;
		this.clearTimer();
	},
	unpause: function(e){
		this.paused = false;
		this.setTimer();		
	},
	startup: function(){
		this.setTimer();
	},
	setTimer: function(){
		if(!this.paused && this.options.rotate) {
			this.timer = setTimeout(this.nextImage.bind(this), this.options.timeout);
		}
	},
	clearTimer: function(){
		clearTimeout(this.timer);
	},
	animate: function(){
		if(this.options.lazy){
			this.lazyLoadNext(this.nextSlide); //because IE sucks
			this.lazyLoadNext(this.nextSlide + 1);
		}
		this.busy = true;
		this.clearTimer();
		this.items[this.currSlide].fade({duration: this.options.speed });
		this.items[this.nextSlide].appear({duration: this.options.speed, afterFinish:function(){this.setTimer(); this.busy = false;}.bind(this)});
	},
	prev_click: function(e){
		Event.stop(e);
		this.clearTimer();
		this.previousImage();
	},
	next_click: function(e){
		Event.stop(e);
		this.clearTimer();
		this.nextImage();
	},
	nextImage: function(){
		if(!this.busy){
			this.clearTimer();
			this.lastSlide = this.currSlide;
			var roll = (this.nextSlide + 1) == this.total;
			this.nextSlide = roll ? 0 : this.nextSlide+1;
			this.currSlide = roll ? this.total-1 : this.nextSlide-1;
			this.animate();
		}
	},
	previousImage: function(){
		if(!this.busy){
			this.clearTimer();
			this.lastSlide = this.currSlide;
			var roll = (this.nextSlide - 1) < 0;
			this.nextSlide = roll ? this.total-1 : this.nextSlide-1;
			this.currSlide = roll ? 0 : this.nextSlide+1;
			this.animate();
		}
	},
	lazyLoadNext: function(i){
		var n = null;
		try{n = this.items[i];}catch(e){n = null}
		if(n!= null && n != undefined){
			n.select('img').each(function(el){
				var att = el.readAttribute('lazy_src');
				if(att != null){
					el.src = att;
				}
			});
		}
		return;
	},
	lazyLoad: function(){
		if(this.options.lazy){
			var n = null
			for(var i=0; i < this.options.lazy_q; i++){
				try{n = this.items[i];}catch(e){n = null}
				if(n!= null || n != undefined){
					n.select('img').each(function(el){
						var att = el.readAttribute('lazy_src');
						if(att != null)
							el.src = att;
					});
				}
			}
		}
		return true;
	}
});