function slideshow() {
  var $active = $('#slideshow img.active');
  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( "slideshow()", 5000 );
} );