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

$(function() {
    setInterval("slideSwitch()", 8000);
});