.nav_up{
	padding: 7px;
	background-color: white;
	border: 1px solid #00BFFF;
	position: fixed;
	background: transparent url(../images/arrow_up.png) no-repeat top right;
	background-position: 50% 50%;
	width: 40px;
	height: 60px;
	bottom: 20px;
	opacity: 0.5;
	right: 1600px;
top: 840px;
	white-space: nowrap;
	cursor: pointer;
	-moz-border-radius: 3px 3px 3px 3px;
    -webkit-border-top-right-radius: 3px;
	-webkit-border-top-right-radius: 3px;
    -khtml-border-top-right-radius: 3px;
	-khtml-border-top-right-radius: 3px;
	filter:progid:DXImageTransform.Microsoft.Alpha(opacity=70);
}
.nav_down{
	padding: 7px;
	background-color: white;
	border: 0px solid #00BFFF;
	position: fixed;
/*---
	background:transparent url(../images/arrow_down.png) no-repeat top right;
*/-------
	background-position: 50% 50%;
	width: 20px;
	height: 20px;
	bottom: 10px;
	opacity: 0.7;
	right: 70px;
	white-space: nowrap;
	cursor: pointer;
	-moz-border-radius: 3px 3px 3px 3px;
    -webkit-border-top-right-radius: 3px;
	-webkit-border-top-right-radius: 3px;
    -khtml-border-top-right-radius: 3px;
	-khtml-border-top-right-radius: 3px;
	filter:progid:DXImageTransform.Microsoft.Alpha(opacity=70);
}