.nav_back{
    float: left;
	padding:7px;
    margin-right: 7px;
	background-color:white;
	border:1px solid #CCC;
	background:transparent url(../images/arrow_back.png) no-repeat top left;
	background-position:50% 50%;
	width:20px;
	height:20px;
	opacity:0.7;
	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_up{
    float: left;
	padding:7px;
    margin-right: 7px;
	background-color:white;
	border:1px solid #CCC;
	background:transparent url(../images/arrow_up.png) no-repeat top left;
	background-position:50% 50%;
	width:20px;
	height:20px;
	opacity:0.7;
	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{
    float: left;
	padding:7px;
	background-color:white;
	border:1px solid #CCC;
	background:transparent url(../images/arrow_down.png) no-repeat top left;
	background-position:50% 50%;
	width:20px;
	height:20px;
	opacity:0.7;
	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);
}