jQuery(function(){
    jQuery('.fadein img:gt(0)').hide();
    setInterval(function(){
      jQuery('.fadein :first-child').fadeOut()
         .next('img').fadeIn()
         .end().appendTo('.fadein');}, 
      3000);
});

/* THIS IS THE CSS
.fadein { position:relative; width:500px; height:500px; }
.fadein img { position:absolute; left:0; top:0; }
*/

/* THIS IS THE HTML
<div class="fadein">
  <img src="#">
  <img src="#">
  <img src="#">
*/

Be sure to put the "THIS IS THE CSS" in your style sheet and the "THIS IS THE HTML" into your HTML file.

jQuery Slideshow

jQuery