function slideSwitch() {
    var $active = $('#slideshow DIV.active');
    if ($active.length == 0) $active = $('#slideshow DIV:last');
    var $next = $active.next().length ? $active.next()
        : $('#slideshow DIV:first');
    $active.addClass('last-active');
    $next.css({ opacity: 0.0 })
        .addClass('active')
        .animate({ opacity: 1.0 }, 1000, function () {
            $active.removeClass('active last-active');
        });
}

$(function () {
    setInterval("slideSwitch()", 5000);
});