.bgtop1{background:url(http://sd.laohu.com/_s/zthf6/bg_top1_20161031.jpg) no-repeat center 0;}
.bgtop2{background:url(http://sd.laohu.com/_s/zthf6/bg_top2_20161031.jpg) no-repeat center 0;}
.bgtop3{background:url(http://sd.laohu.com/_s/zthf6/bg_top3_20161031.jpg) no-repeat center 0;}
.bgfot1, .bgfot2, .bgfot3{ background: none;}

.nav a{ width: auto; padding-right: 12px;}
.nav a.n3{ background: url(http://sd.laohu.com/_s/zthf4/nav_3_20161031.png) no-repeat 9px 12px;}
.nav a.n3:hover{color: #7f0a70; border-bottom: 4px solid #7f0a70; background-position:9px -49px;}
.nav a.n4{ background: url(http://sd.laohu.com/_s/zthf4/nav_4_20161031.png) no-repeat 9px 12px;}
.nav a.n4:hover{color: #cb9f30; border-bottom: 4px solid #cb9f30; background-position:9px -52px;}