.navs {
	width: 1280px;
	height: 150px;
	left:50%;
	margin-left: -550px;
	top: 900px;
	z-index: 99;
}
.nav1,.nav2,.nav3,.nav4 {
	width: 290px;
	height: 84px;
	margin-right:20px;
}

.nav1 {
	margin-left:90px;
	background:url(../images/xz.png) no-repeat;
}
.nav1:hover,.nav2:hover，.nav3:hover，.nav4:hover{cursor: pointer;}
.nav1:hover,.nav2:hover,.nav3:hover,.nav4:hover {
	margin-top:-10px;	
}

.nav2 {
	background:url(../images/cz.png) no-repeat;
}

.nav3 {
	background:url(../images/kf.png) no-repeat;
}