function slideSwitch(switchSpeed) {
    var $active = $('#slideshow div.active');

    if ($active.length == 0) $active = $('#slideshow div:last');

    var $next = $active.next('div').length ? $active.next('div')
        : $('#slideshow div:first');

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


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

$(function() {
    setInterval("slideSwitch(1000)", 10000);
});