function slideshow() {
    var $active = $('#slideshow a.active');
    if ($active.length == 0) {
        $active = $('#slideshow a:last');
    }
    var $next = $active.next().length ? $active.next() : $('#slideshow a:first');
    $active.addClass('last-active');
    $next.css({
        opacity: 0.0
    }).addClass('active').animate({
        opacity: 1.0
    }, 700, function () {
        $active.removeClass('active last-active');
    });
}