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()", 6000 );
});