/*
  Simple slideshow using prototype and scriptaculous.
  
  Usage:
  
    <script src="prototype.js"></script>
    <script src="effects.js"></script>
    <script src="slideshow.js"></script>
    <style type="text/css">
      #slideshow { position: relative; width: 100px; height: 100px; }
      #slideshow div { position: absolute; left: 0; top: 0; }
    </style>
    <div class="slideshow" id="slideshow">
      <div class="slide"><img src="slide1.jpg"></div>
      <div class="slide"><img src="slide2.jpg"></div>
      <div class="slide"><img src="slide3.jpg"></div>
    </div>
    <script type="text/javascript">new Slideshow('slideshow', 3000);</script>
  
  See also: http://blog.remvee.net/post/17
  
  Copyright (c) 2006 - R.W. van 't Veer
*/

function Slideshow(slideshow, timeout) {
    this.slides = [];
    var nl = $(slideshow).getElementsByTagName('div');
    for (var i = 0; i < nl.length; i++) {
      if (Element.hasClassName(nl[i], 'slide')) {
        this.slides.push(nl[i]);
      }
    }
    for (var i = 0; i < this.slides.length; i++) {
      this.slides[i].style.zIndex = this.slides.length - i;
    }

//Dan wordt de next functie getimed:

    this.timeout = timeout;
    this.current = 0;

    Element.show(slideshow);
    setTimeout((function(){this.next();}).bind(this), this.timeout + 850);
  }

//Deze next functie schuift alle de z-index door:

  Slideshow.prototype = {
    next: function() {
      for (var i = 0; i < this.slides.length; i++) {
        var slide = this.slides[(this.current + i) % this.slides.length];
        slide.style.zIndex = this.slides.length - i;
      }

//Laat dan de bovenste afbeelding zachtjes verdwijnen:

      Effect.Fade(this.slides[this.current], {

//Gooit hem daarna onderop:

        afterFinish: function(effect) {
          effect.element.style.zIndex = 0;
          Element.show(effect.element);
          Element.setOpacity(effect.element, 1);
        }
      });

//En zorgt dat de volgde “slide” getimed staan:

      this.current = (this.current + 1) % this.slides.length;
      setTimeout((function(){this.next();}).bind(this), this.timeout + 850);
    }
  }