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');
    });
}
    
$(document).ready(function() {

        setInterval( "slideSwitch()", 5000 );

});