var ImgShow=Class.create();ImgShow.prototype={initialize:function(element,options){this.element=$(element);this.options=Object.extend(options);this.images=document.getElementsByClassName(this.options.className,this.element);this.prepareimages();this.registerCallback();},prepareimages:function(){this.currentimage=this.images.first();this.element.style.position='relative';this.element.style.height=this.images.max(function(image){var visible=Element.visible(image),height;Element.setStyle(image,{position:'absolute',width:'100%',left:'0px'});if(!visible)Element.show(image);height=Element.getHeight(image);if(!visible)Element.hide(image);return height;}).toString()+'px';},nextimage:function(){return this.images[(this.images.indexOf(this.currentimage)+1)%this.images.length];},registerCallback:function(){window.setTimeout(this.tick.bind(this),this.options.duration*1000);},tick:function(){var currentimage=this.currentimage,nextimage=this.nextimage();new Effect.Parallel([new Effect.Fade(currentimage,{sync:true}),new Effect.Appear(nextimage,{sync:true})],{duration:5,afterFinish:(function(effect){this.currentimage=nextimage;this.registerCallback();}).bind(this)})}}