note that for the corners to work in IE, you need to install the htc code from http://code.google.com/p/curved-corner/

.curved {
-moz-border-radius:10px; /* Firefox */
-webkit-border-radius:10px; /* Safari and chrome */
-khtml-border-radius:10px; /* Linux browsers */
border-radius:10px; /* CSS3 */
behavior:url(border-radius.htc); /* make IE use properties of border-radius */
}