复制代码代码如下:
*{ margin:0; padding:0;}
ul li{ list-style:none;}
.nav{ width:800px; height:40px; margin:150px auto;}
.nav ul li{ float:left; width:200px;}
.nav ul li a:link,a:visited{ display:block; width:190px; height:40px; background:url(/jscss/demoimg/wall_s1.jpg);}
.nav ul li a:hover{background:url(/jscss/demoimg/wall_s2.jpg);}
.nav ul li a:active{background:url(/jscss/demoimg/wall_s3.jpg);}
