var Rotater = new Class( 
{
   Implements : [Options, Events], options : {slideInterval : 4000, transitionDuration : 1000, startIndex : 0, autoplay : true}
   , initialize : function(B, A) {
      this.setOptions(A); this.slides = $$(B); this.createFx(); this.showSlide(this.options.startIndex); if(this.slides.length < 2) {
         this.options.autoplay = false}
      if(this.options.autoplay) {
         this.autoplay()}
      return this}
   , toElement : function() {
      return this.container}
   , createFx : function() {
      if(!this.slideFx) {
         this.slideFx = new Fx.Elements(this.slides, {
            duration : this.options.transitionDuration}
         )}
      this.slides.each(function(A) {
         A.setStyle("opacity", 0)}
      )}
   , showSlide : function(B) {
      var A = {
         }; this.slides.each(function(C, D) {
         if(D == B && D != this.currentSlide) {
            A[D.toString()] = {
               opacity : 1}
            }
         else {
            A[D.toString()] = {
               opacity : 0}
            }
         }
      , this); this.fireEvent("onShowSlide", B); this.currentSlide = B; this.slideFx.start(A); return this}
   , autoplay : function() {
      this.slideshowInt = this.rotate.periodical(this.options.slideInterval, this); this.fireEvent("onAutoPlay"); return this}
   , stop : function() {
      $clear(this.slideshowInt); this.fireEvent("onStop"); return this}
   , rotate : function() {
      current = this.currentSlide; next = (current + 1 >= this.slides.length) ? 0 : current + 1; this.showSlide(next); this.fireEvent("onRotate", next); return this}
   }
);

Rotater.implement(new Options); 
Rotater.implement(new Events);