nav_up{
padding:7px;
background-color:white;
border:1px solid #CCC;
position:fixed;
background:transparent url(http://lh6.googleusercontent.com/-7zE5N9GdDUk/T6rH17KE6II/AAAAAAAACeQ/aEcKRyEhxsE/s16/arrow_up.png) no-repeat top left;
background-position:50% 50%;
width:20px;
height:20px;
bottom:10px;
left:30px;
white-space:nowrap;
cursor: pointer;
border-radius: 3px 3px 3px 3px;
opacity:0.7;
filter:progid:DXImageTransform.Microsoft.Alpha(opacity=70);
}
.nav_down{
padding:7px;
background-color:white;
border:1px solid #CCC;
position:fixed;
background:transparent url(http://lh6.googleusercontent.com/-sukwuViZaYY/T6rH15A8niI/AAAAAAAACeM/YErd0S8lPGA/s16/arrow_down.png) no-repeat top left;
background-position:50% 50%;
width:20px;
height:20px;
bottom:10px;
left:70px;
white-space:nowrap;
cursor: pointer;
border-radius: 3px 3px 3px 3px;
opacity:0.7;
filter:progid:DXImageTransform.Microsoft.Alpha(opacity=70);
}
-->