background: #000;
border: 4px solid #66f;
border-radius: 20px;
-moz-border-radius: 20px;
-webkit-border-radius: 20px;
behavior: url(border-radius.htc);

background: #000 url(border-radius.png);
border: 4px solid #66f;
border-radius: 20px;
-moz-border-radius: 20px;
-webkit-border-radius: 20px;
behavior: url(border-radius.htc);