15 Line jQuery Slideshow.js

function slideShow(elem) {
    return (function () {
        var next_elem = (elem.next().length > 0) ? elem.next() : $('#slide-images p:first');
        elem.fadeOut(1000);
        next_elem.fadeIn(1000);
        setTimeout(slideShow(next_elem), 5000);
    })
}

$(document).ready(function () {
    if ($('#slide-images').length > 0) {
        var elem = $('#slide-images p:first');
        setTimeout(slideShow(elem), 4000);
    }
});