function cambioSlide(){
    var total = $('ul.slideshow li').size();
    var visible = $('ul.slideshow li:visible');
    var numero = visible.index('ul.slideshow li');
   
    if(numero == (total-1)){
        visible.animate({opacity:0}, 'normal', 'linear', function(){
            visible.hide();
            $('ul.slideshow li:first').show().animate({opacity:1});
        });
        numero = -1;
    } else{
        visible.animate({opacity:0}, 'normal', 'linear', function(){
            visible.hide();
            visible.next('li').show().animate({opacity:1});
        });
    }

    $('ul.slideshowCtrl li.selected').removeClass('selected');
    $('ul.slideshowCtrl li:eq('+(numero+1)+')').addClass('selected');
}

$(document).ready(function(){
    var intervalo = setInterval(cambioSlide, 5000);
});