// JavaScript Document
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

var resetNecessary = true;

var Slideshow = new Class({
  Implements: [Options, Chain],

  options: {
    images:         [],   // welche Bilder sollen angezeigt werden?
    container:      null, // welche ID hat der Container-Div?
    delayNextImage: 5000, // wie lange soll ein Bild angezeigt werden?
		delayFading:    500   // Zeitabstand zwischen Fade-Out des alten und Fade-In des neuen Bildes
  },

  elements: {
    container:      null,
    images:         null
  },

  currentImage: 0,

  initialize: function(options) {
    this.setOptions(options);

		this.elements.container = $(this.options.container);
    this.elements.images = new Asset.images(this.options.images, { // Bilder laden
      onComplete: function(){
        this.elements.images.each(function(el) {
          el.fade('out').setStyle("display", "none").injectInside(this.elements.container);
        }.bind(this));
        this.elements.images[0].setStyle("display", "block").fade('in');

        this.runChain(); // Slideshow starten, wenn alles geladen ist
      }.bind(this)
    });
  },

  runChain: function() { // Slideshow-Ablauf
    this.chain(
      this.fadeOut,
      this.swapImage,
      this.fadeIn
    );
    this.callChain.delay(this.options.delayNextImage, this);
  },

  fadeOut: function() {
		this.getCurrentImage().fade('out');

		this.callChain.delay(this.options.delayFading, this);
  },

  swapImage: function() {
		this.getCurrentImage().setStyle("display", "none");
		this.getNextImage().setStyle("display", "block");

    this.callChain();
  },

  fadeIn: function() {
    this.getCurrentImage().fade('in');

		this.runChain();
  },

	getCurrentImage: function() { // Img-Element holen
    return this.elements.images[this.currentImage];
  },

  getNextImage: function() { // Img-Element holen
    this.currentImage++;
    if (this.currentImage >= this.elements.images.length) this.currentImage = 0;
    return this.getCurrentImage();
  }
});