function slideSwitch() {
    var $active = $("#slideshow IMG.active");

    if ($active.length == 0) $active = $("#slideshow IMG:last");

    var $next = $active.next().length ? $active.next()
            : $("#slideshow IMG:first");

    $active.addClass("last-active");

    $next.css({opacity: 0.0})
            .addClass("active")
            .animate({opacity: 1.0}, 1000, function() {
        $active.removeClass("active last-active");
    });
}

$(function() {
    if ($('#slideshow IMG').length > 1) {
        setInterval("slideSwitch()", 5000);
    }
});