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

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