/* Slideshow using prototype and scriptaculous */
var delay = 3000;
var duration = 1.5; // fade/appear time in second

function Slideshow(slideshow) {
  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]);
    }
  }
  this.delay = delay;
  this.current = 0;

  for (var i = 0; i < this.slides.length; i++) {
    this.slides[i].style.zIndex = this.slides.length - i;
  }

  Element.show(slideshow);
  setTimeout((function(){this.next();}).bind(this), this.delay);
}

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;
    }

    Effect.Fade(this.slides[this.current], {
	  duration: duration,
      afterFinish: function(effect) {
        effect.element.style.zIndex = 0;
        Element.show(effect.element);
        Element.setOpacity(effect.element, 1);
      }
    });
    
    this.current = (this.current + 1) % this.slides.length;
    setTimeout((function(){this.next();}).bind(this), this.delay + 2500);
  }
}

/* Start commands when document is loaded */
startSlideshow = function(){
	new Slideshow('slideshow');
}
if (window.addEventListener) {
window.addEventListener("load", startSlideshow, false);
}
else if (window.attachEvent) {
window.attachEvent("onload", startSlideshow);
}