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')
    .fadeTo(750, 1.0, function() {
        $active.removeClass('active last-active');
      });
}

$(function () {
    setInterval("slideSwitch()", 4500 );
  });