CSS3 box-shadow/-moz-box-shadow/-webkit-box-shadow:

浏览器参照基准：Firefox3.6 and Later, Chrome5 and Later, Safari5 and Later, Opera10.53 and Later, IE系列不做参考

圆角+阴影效果：

#box-shadow{
	-moz-box-shadow:5px 5px 5px #444;               /* For Firefox3.6+ */
	-webkit-box-shadow:5px 5px 5px #444;            /* For Chrome5+, Safari5+ */
	box-shadow:5px 5px 5px #444;                    /* For Latest Opera */
}

圆角+半透明+阴影效果：

#box-shadow2{
	-moz-box-shadow:5px 5px 5px rgba(0,0,0,.4);               /* For Firefox3.6+ */
	-webkit-box-shadow:5px 5px 5px rgba(0,0,0,.4);            /* For Chrome5+, Safari5+ */
	box-shadow:5px 5px 5px rgba(0,0,0,.4);                    /* For Latest Opera */
}