.nav_up{
	padding:7px;
	background-color:white;
	border:1px solid #CCC;
	position:fixed;
	background:transparent url(../images/arrow_up.png) no-repeat top left;
	background-position:50% 50%;
	width:20px;
	height:20px;
	bottom:10px;
	opacity:0.7;
	left:30px;
	white-space:nowrap;
	cursor: pointer;
	-moz-border-radius: 3px 3px 3px 3px;
    -webkit-border-top-left-radius:3px;
	-webkit-border-top-right-radius:3px;
    -khtml-border-top-left-radius:3px;
	-khtml-border-top-right-radius:3px;
	filter:progid:DXImageTransform.Microsoft.Alpha(opacity=70);
}
.nav_down{
	padding:7px;
	background-color:white;
	border:1px solid #CCC;
	position:fixed;
	background:transparent url(../images/arrow_down.png) no-repeat top left;
	background-position:50% 50%;
	width:20px;
	height:20px;
	bottom:10px;
	opacity:0.7;
	left:70px;
	white-space:nowrap;
	cursor: pointer;
	-moz-border-radius: 3px 3px 3px 3px;
    -webkit-border-top-left-radius:3px;
	-webkit-border-top-right-radius:3px;
    -khtml-border-top-left-radius:3px;
	-khtml-border-top-right-radius:3px;
	filter:progid:DXImageTransform.Microsoft.Alpha(opacity=70);
}#back-top {
	position: fixed;
	margin-left: -150px;
        bottom: 0;
        right: 0;
}
#back-top a {
	width: 108px;
	display: block;
	text-align: center;
	font: 11px/100% Arial, Helvetica, sans-serif;
	text-transform: uppercase;
	text-decoration: none;
	/*color: #bbb;*/
	/* background color transition */
	/*-webkit-transition: 1s;
	-moz-transition: 1s;
	transition: 1s;*/
}
#back-top a:hover {
	color: #000;
}
/* arrow icon (span tag) */
#back-top span {
	width: 108px;
	height: 108px;
	display: block;
	margin-bottom: 7px;
	background:url(../images/up-arrow.png) no-repeat center center;
	/* rounded corners */
	-webkit-border-radius: 15px;
	-moz-border-radius: 15px;
	border-radius: 15px;
	/* background color transition */
	-webkit-transition: 1s;
	-moz-transition: 1s;
	transition: 1s;
}
#back-top a:hover span {
	/*background-color: #777;*/
}