$(function() {
    $('.diapo').cycle({
        fx:        'uncover',
       cssBefore: { opacity: 1 },
       animOut:   { opacity: 0 },
       direction: 'right', // one of up|down|left|right  default=left
       delay:    -2000,
       timeout: 4000,
       speed: 2000
    });
});