.nav_up{
	padding:7px;
	background-color:white;
	position:fixed;
	background:transparent url(../images/arrow_up.png) no-repeat top left;
	background-position:50% 50%;
	width:30px;
	height:30px;
	bottom:20px;	
	right:30px;
	white-space:nowrap;
	cursor: pointer;
	z-index: 11111111;
	filter:progid:DXImageTransform.Microsoft.Alpha(opacity=70);
}
.nav_down{
	padding:7px;
	background-color:white;
	position:fixed;
	background:transparent url(../images/arrow_down.png) no-repeat top left;
	background-position:50% 50%;
	width:30px;
	height:30px;
	bottom:20px;	
	right:70px;
	white-space:nowrap;
	cursor: pointer;
	z-index: 11111111;
	filter:progid:DXImageTransform.Microsoft.Alpha(opacity=70);
}