var SlideShow = new Class({
        Implements: Options,
        options: {
                pause: 10000,
                loop: true,
                onComplete: Class.empty,
                onStart: Class.empty
        },
        initialize: function(container,options) {
                this.setOptions(options);
                this.container = $(container);
                this.imgs = this.container.getElements('img');
                this.imgs.setStyles({
                        'position':'absolute',
                        'top':0,
                        'left':0,
                        'opacity':0
                });
                this.imgs[0].setStyle('opacity',1);
                this.el = new Element('div',{'styles': {
                        'position':'relative'
            }});
            this.el.injectInside(this.container);
            this.el.adopt(this.imgs);
                this.next = 0;
                this.start();
        },
        start: function() {
                this.show();
                this.periodical =this.show.bind(this).periodical(this.options.pause);
        },
        stop: function() {
                $clear(this.periodical);
        },
        show: function() {
                if (!this.options.loop && this.next==this.imgs.length-1)
this.stop();
                this.next = (this.next==this.imgs.length-1)?0:this.next+1;
                var prev = (this.next==0)?this.imgs.length-1:this.next-1;

                this.imgs[this.next].fade('in');
                this.imgs[prev].fade('out');
                
                
        }
});