@media only screen and (min-width: 1020px){
	#navdu{display: none}
}
.nav_up{
	padding:8px;
	border: 1px solid #333;
	position: fixed;
	background:url(../images/nav.png) no-repeat;
	background-position: bottom;
	width:34px;
	height:26px;
	bottom:100px;
	right: 5px;
	z-index: 999;
	white-space:nowrap;
	cursor: pointer;
}
.nav_down{
	padding:8px;
	border: 1px solid #fff;
	position: fixed;
	background: url(../images/nav.png) no-repeat;
	background-position: top;
	width:34px;
	height:26px;
	bottom:50px;
	right:5px;
	z-index: 999;
	white-space:nowrap;
	cursor: pointer;
}