Effeito fadein slider

Gostaria de saber como altero esse script para o efeito fadein

$(function(){
 $('#slides').slides({
 preload: true,
 preloadImage: 'img/loading.gif',
 play: 5000,
 pause: 2300,
 hoverPause: true,
 animationStart: function(current){
 $('.caption').animate({
 bottom:-35
 },100);
 if (window.console && console.log) {
 // example return of current slide number
 console.log('animationStart on slide: ', current);
 };
 },
 animationComplete: function(current){
 $('.caption').animate({
 bottom:0
 },200);
 if (window.console && console.log) {
 // example return of current slide number
 console.log('animationComplete on slide: ', current);
 };
 },
 slidesLoaded: function() {
 $('.caption').animate({
 bottom:0
 },200);
 }
 });
 });