dopo qualche prova cosi funziona:
codice:
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript" src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
<script type="text/javascript">
function attiva(){
var stampa = '<div id="content">ciao mondo</div>' ;
$('#profilo').append(stampa)
$('#content').fadeIn(700).delay(1000).fadeOut(700, function(){$(this).delay(1000).remove()})
}
</script>
<style type="text/css">
body {
font-family: Verdana, Geneva, sans-serif;
font-size: 12px;
color: #000;
margin: 0px;
padding: 0px;
height: 100%;
width: 100%;
background-color: #Fafafa;
}
html{width:100%; height:100%;}
#content{
height: 500px;
width: 500px;
border: 1px solid #000;
display:none;
margin-right: auto;
margin-left: auto;
}
#profilo{
width:910px;
height:610px;
margin-left:auto;
margin-right:auto;
background-color:#FFF;
}
</style>
<title>Untitled Document</title>
</head>
<div id="profilo"></div>
<input name="fade" type="button" onClick="attiva()" value="mostra div">
<body>
</body>
</html>