.wraper{ width:1003px; margin:0 auto}
.nav{
	position:relative;
	width:1003px;
	height:40px;
	overflow:hidden;
	background-color: #2b2b2b;
	float: left;
}
.nav-item{ position:relative; float:left; width:120px; height:40px; line-height:40px; text-align:center; font-size:14px; z-index:1}
.nav-item a{ display:block; height:40px; color:#fff; }
.nav-item a:hover{ color:#fff}
.move-bg{
	display:none;
	position:absolute;
	left:0;
	top:0;
	width:120px;
	height:40px;
	z-index:0;
	background-color: #1b1b1b;
}