<script type="text/javascript"> $(document).ready(function(){ $(".rounded").corner("cc:#009 55px"); }); </script>
espero ter ajudado,

o script completo esta aqui esse:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> <script type="text/javascript" src="http://github.com/malsup/corner/raw/master/jquery.corner.js?v2.09"></script> <script type="text/javascript"> $(document).ready(function(){ $(".rounded").corner("cc:#ccc 55px"); }); <div id="box4" class="rounded">kkkk<br/></div>
qualquer coisa podem mandar um e-mail =D