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