function slideSwitch() {
    var $active = $('#slideshow .active');
    if ($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')
    //adjust value to change the time taken to fade between images
		.animate({ opacity: 1.0 }, 3000, function () {
		    $active.removeClass('active last-active');
		});
}

$(function () {
    //adjust value to change the interval between each image change
    setInterval("slideSwitch()", 7000);
});