类型	Internet Explorer	Firefox	Chrome	Opera	Safari
版本	(×)IE6	(×)Firefox 2.0	(√)Chrome 1.0.x	(×)Opera 9.64	(√)Safari 3.1
	(×)IE7	(√)Firefox 3.0	(√)Chrome 2.0.x
	(×)IE8	(√)Firefox 3.5

border-radius:25px;
-moz-border-radius:25px; /* 老的 Firefox */

border-bottom-left-radius: 6px;
border-bottom-right-radius: 66px;