var Slideshow = new Class({
	initialize: function(containerId, myOptions) {
		// global vars
		this.myElements = $(containerId).getElements(myOptions.items);
		
		this.myElements.each(function(myElement) {
			myElement.setStyle('visibility', 'hidden');
		});			
		if(this.myElements.length > 0 ){		
			this.currentIndex = 0;
			this.myElements[this.currentIndex].setStyle('visibility', 'visible');
			
			($type(myOptions.frameDelay)) ? this.frameDelay = myOptions.frameDelay : this.frameDelay = 3000;
			($type(myOptions.loop)) ? this.loop = myOptions.loop : this.loop = false;
			($type(myOptions.hasFade)) ? this.hasFade = myOptions.hasFade : this.hasFade = true;
			
			if(this.hasFade){
				this.isFadeIn = false;
				this.initEffects();
				this.zIndex = this.myElements.length;
				this.initElements();
				//start slideshow
				this.goTo.delay(this.frameDelay, this, this.myElements[this.currentIndex]);
				this.currentIndex++;	
			} else {
				this.zIndex = this.myElements.length;
				this.initElements();
				this.goTo.delay(this.frameDelay, this, this.myElements[this.currentIndex]);
			}
		}
	},
	initElements: function(){
		var tmpZ = this.zIndex;
		this.myElements.each(function(myElement){
			myElement.setStyle("z-index",tmpZ);
			tmpZ--;	
		}.bind(this));			
	},
	initEffects: function(){
		this.myEffects = new Array();
		this.myElements.each(function(myElement){
		  	var newEffect = new Fx.Styles(myElement, {
		   		duration: 1000, 
				transition: Fx.Transitions.linear, 
				onComplete: this.goTo.bind(this)
			});
			this.myEffects.push(newEffect);
		}.bind(this));		
	},

	goTo: function(lastElement) {
		if(this.hasFade){
			this.zIndex++;
			if(this.loop && this.isFadeIn && this.currentIndex == (this.myEffects.length)){
				this.currentIndex = 0;
			}
			var nextEffect = this.myEffects[this.currentIndex];
			var nextElement = nextEffect.element;
			nextElement.setStyle('opacity', 0);
			nextElement.setStyle("z-index", this.zIndex);	
			this.fadeIn.delay(this.frameDelay, this, nextEffect);	
			this.currentIndex++;
		} else {
			(this.currentIndex == (this.myElements.length-1) && this.loop) ? this.currentIndex = 0 : this.currentIndex++;
			this.zIndex++;
			var nextElement = this.myElements[this.currentIndex];
			
			if($type(nextElement)){
				lastElement.setStyle('visibility', 'hidden');
				nextElement.setStyle('visibility', 'visible');
				nextElement.setStyle("z-index", this.zIndex);		
				this.goTo.delay(this.frameDelay, this, nextElement);
			}
		}

	},
	fadeIn: function(effect) {
		this.isFadeIn = true;
		effect.start({
			'opacity': [0, 1]
		});	
	},
	fadeOut: function(effect) {
		this.isFadeIn = false;
		effect.start({
			'opacity': [1, 0]
		});
	}
});