Ho provato a fare qualcosa.
Ho inserito i riferimenti al javasript nell'head del file index.html ma non cambia niente gli angoli non sono arrotondati.
Ecco il codice dell'index.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Lucaiafrate.it -The passion of photography-</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" >
<meta name="Keywords" CONTENT="Luca Iafrate, FotoPlayer, Free Photo Album, Jalbum, FLASH, PHP, XML, flash based photo gallery, Atina, Qtp, fotografia, paesaggi, architettura, fauna, ritratti, sport, still life, street, olympus, quattro terzi, E510, zuiko, zuiko 12 60 swd, sigma, OM, 70 300 zuiko, attrezzatura, download, downloads, download foto, downloads foto, photo, photo comment, rss, flickr, facebook, news, link" >
<link rel="stylesheet" href="layout_css.css" type="text/css" />

<link rel="alternate" type="application/rss+xml" href="rss.php" title="FotoPlayer v3.1 RSS Feed" >

<link rel="stylesheet" type="text/css" href="niftyCorners.css">
<link rel="stylesheet" type="text/css" href="niftyPrint.css" media="print">
<script type="text/javascript" src="nifty.js"></script>

<script type="text/javascript">
window.onload=function(){
if(!NiftyCheck())
return;
Rounded("div#nifty","all","#FFF","#D4DDFF","smooth ");
}
</script>



<link href="res/styles.css" rel=stylesheet>
<script type="text/javascript" src="res/javascript.js"></script>
<script type="text/vbscript" language="vbscript"> Function CheckFlash(version) on error resume next
CheckFlash= IsObject(CreateObject("ShockwaveFlash.ShockwaveFla sh." & version)) End Function </script>



<style type="text/css">
<!--
.Stile1 {
color: #CCCCCC;
font-size: 9px;
}
-->
</style>
</head>

<body>


<div id="nifty">
<div id="testa">




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</p>
</div></div>