YinMengWu

.rounded-corners { -moz-border-radius: 10px; /* Firefox */ -webkit-border-radius: 10px; /* Safari, Chrome */ -khtml-border-radius: 10px; /* Konqueror */ border-radius: 10px; /* Opera 10.50 and later (CSS3 standard) */ behavior: url(border-radius.htc); /* IE6, IE7, IE8 */ } 
-moz-border-radius:  5px 10px 15px 20px ; /* Firefox */
-webkit-border-radius: 0px 0px 20px 20px ; /* Safari, Chrome */
-khtml-border-radius:  10px ; /* Konqueror */
border-radius:  10px ; /* Opera 10.50 and later (CSS3 standard) */
behavior: url(border-radius.htc); /* IE6, IE7, IE8 */

參考網站: 
http://mepopedia.com/forum/read.php?804,15393 
http://www.css3.info/preview/rounded-border/ 
http://blog.mukispace.com/css-border-radius/ 
http://wordpress.play-learn.net/wordpress/themes/theme-hack/css_border-radius.html