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()", 5000 );
});