#nav_up, #nav_up ul{
font-family:"Tw Cen MT";
font-size:14px;
text-align:center;
margin:0;
padding:0;
list-style-type:none;
list-style-position:outside;
position:relative;
line-height:1.5em; 
}

#nav_up a{
display:block;
height:27px;
width:118px;
padding-right:5px;
padding-left:5px;
color:#fff;
text-decoration:none;
background:url(../img/bottonup.png);
background-position:0 54;
}

#nav_up a:hover{
background-position:0 27;
}

#nav_up li{
float:left;
position:relative;
}

#nav_up ul {
position:absolute;
display:none;
width:12em;
top:1.5em;
}