<title>变亮效果的CSS按钮</title><style type="text/css">.aaa {    height: 22px;    width: 72px;    background-image: url(http://www.codefans.net/jscss/demoimg/201105/chakan_btn_bg.gif);    font-size: 12px;    line-height: 22px;    text-align: center;    display: block;    text-decoration: none;    background-repeat: no-repeat;    background-position: 0px 0px;}.aaa a:link {    height: 22px;    width: 72px;    background-image: url(http://www.codefans.net/jscss/demoimg/201105/chakan_btn_bg.gif);    font-size: 12px;    line-height: 22px;    text-align: center;    display: block;    text-decoration: none;    background-repeat: no-repeat;    background-position: 0px 0px;}.aaa a:hover {    height: 22px;    width: 72px;    font-size: 12px;    line-height: 22px;    text-align: center;    background-image: url(http://www.codefans.net/jscss/demoimg/201105/chakan_btn_bg.gif);    background-position: 0px -22px;    display: block;    background-repeat: no-repeat;}</style>