***** CSS *****
#box {width:18em; margin:0 auto; padding:20px; background:#E6E6E6; color:#000}

***** JAVASCRIPT *****
<script type="text/javascript" src="js/niftycube.js"></script>
<script type="text/javascript">window.onload=function(){Nifty("div#box","big")}</script>

***** HTML *****
<div id="box">
  <h1>Nifty Corners Cubeâ„¢</h1>
  <p>One call. Two parameters. Three sizes.</p>
</div>

http://www.html.it/articoli/niftycube/index.html

Esquinas redondeadas / Nifty corners

JavaScript