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var MDSK = {}
MDSK.Slideshow = Class.create();
MDSK.Slideshow.DefaultOptions = {
  duration: 1.0,
  seconds_per_slide: 3.0,
  pause_on_mouseover: false, // TODO: pause_on_mouseover
  onChange: function() {}
}

Object.extend(MDSK.Slideshow.prototype, {
  initialize: function(container, slide_selector, options) {
	var me = this;  
	this.options = Object.extend(Object.extend({},MDSK.Slideshow.DefaultOptions), options || {});
	this.container = $(container);
	this.slides = Selector.findChildElements(this.container, [slide_selector]);
//	this.slides.sort(function(a,b){
//			return me.rndm(-1,1);
//		});
	this.currentSlide = 0;
	this.paused = false;
	var self = this;
	var Found=false
	this.slides.each(function(slide, idx) {
	  if (idx > 0) Element.hide(slide);
	  if (self.options.pause_on_mouseover) {
		// Event.observe(slide, 'mouseover', self.pause.bind(self))
		// Event.observe(slide, 'mouseout', self.unpause.bind(self))
	  }
	})
	this.slides[0].style.display = "block";
   	
	this.start();
	this.options.onChange(this);
  },
  
  forward: function() {
	var newSlideIdx = this.currentSlide+1;
	if (newSlideIdx >= this.slides.length) newSlideIdx = 0;
	this.transition(newSlideIdx);
  },
  
  backward: function() {
	var newSlideIdx = this.currentSlide-1;
	if (newSlideIdx < 0) newSlideIdx = this.slides.length-1;
	
	var currNum = newSlideIdx+1;
	var num1 = document.getElementById("numDisp");	
	num1.src = null;
	num1.src = "" + currNum + ".jpg";

	this.transition(newSlideIdx);
  },

  jumpToSlide: function(idx) {
	if (idx < 0 || idx >= this.slides.length) return false;
	this.stop();
	if (this.interval)  this.stop();
	else				this.start();
	this.transition(idx);
	for (i = 0; i < this.slides.length; i++)
	{
		var nam = document.getElementById("showStyle"+i);
		if(idx == i)
		{
			nam.className="sel";
		}
		else
		{
			nam.className="";
		}
	}
  },
  
  start: function() {
	if (this.interval) return;
	this.interval = setInterval(this.forward.bind(this), this.options.seconds_per_slide * 1000);
	this.container.addClassName('playing');
  },
  
  stop: function() {
	if (!this.interval) return;
	clearInterval(this.interval);
	this.interval = null;
	this.container.removeClassName('playing');
  },
  
  pausePlay: function() {
	if (this.interval)  this.stop();
	else				this.start();
	},
	
  rndm : function(min, max){
		return Math.floor(Math.random() * (max - min + 1) + min);
	},			
	
  /* ========== */
  
  transition: function(newSlideIdx) {
	
	var oldSlideIdx = this.currentSlide;
	if (newSlideIdx == oldSlideIdx) return;
	if (this.fadeIn && this.fadeIn.state != 'finished') this.fadeIn.cancel();
	if (this.fadeOut && this.fadeOut.state != 'finished') {
	  this.fadeOut.cancel(); Element.hide(this.fadeOut.element);
	}
	
	this.fadeOut = new Effect.Fade(this.slides[oldSlideIdx], {duration: this.options.duration});
	this.fadeIn = new Effect.Appear(this.slides[newSlideIdx], {duration: this.options.duration});
	this.currentSlide = newSlideIdx;
	this.options.onChange(this);
	for (i = 0; i < this.slides.length; i++)
	{
		var nam = document.getElementById("showStyle"+i);
		if(newSlideIdx == i)
		{
			nam.className="sel";
		}
		else
		{
			nam.className="";
		}
	}
	
/* ------------------custom code - you can delete this if you want to customize the slideshow\s look and feel your way. this code is used to change the background color of the div's when slideshow moves from one slide to another---------------*/
	
	/*--------------------------custom code ends ----------------------*/
  } 
});