function slideSwitch() {
    var run = $('#slideshow IMG.run');

    if ( run.length == 0 ) run = $('#slideshow IMG:last');

    var next =  run.next().length ? run.next()
        : $('#slideshow IMG:first');

    run.addClass('last-run');

    next.css({opacity: 0.0})
        .addClass('run')
        .animate({opacity: 1.0}, 1000, function() {
            run.removeClass('run last-run');
        });
}

$(function() {
    setInterval( "slideSwitch()", 6000 );
});