function slideSwitch(){
                var $act = $('#slideshow IMG.act');

                if ($act.length == 0)
                    $act = $('#slideshow IMG:last');

                var $next = $act.next().length ? $act.next() : $('#slideshow IMG:first');

                $act.addClass('last-act');

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

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