$('#s1').cycle({ fx: 'fade', timeout: 16000, delay: -12000 });
$('#s2').cycle({ fx: 'fade', timeout: 16000, delay: -8000 });
$('#s3').cycle({ fx: 'fade', timeout: 16000, delay: -4000 });
$('#s4').cycle({ fx: 'fade', timeout: 16000 });