Prova così
codice:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Documento senza titolo</title>  
<script type="text/javascript" src="jquery-1.7.min.js"></script> 
<script type="text/javascript" src="jquery.qtip.min.js"></script> 
</head>
<body>
<script type="text/javascript">// <=!=[=C=D=A=T=A=[
$(function(){
    $('.fadein img:gt(0)').hide();
    setInterval(function(){$('.fadein :first-child').fadeOut().next('img').fadeIn().end().appendTo('.fadein');}, 3000);
});
// ]=]=></script>
<div class="fadein" style="height: 156px; width: 201px;">
<img src="01.jpg" height="200" width="200" /> 
<img src="02.jpg" height="200" width="200" /> 
<img src="03.jpg" height="200" width="200" />
</div>
</body>
</html>
devi però scaricare i file jquery