CSS: Links in Navigatin zentral

h1#title, h2#title span, div.header
{
display: none;
}

li.nav_element
{
list-style-type: none;
}

body
{
background-image:url(http://img191.imageshack.us/img191/6022/hintq.jpg);
}
a, a:hover, a:link, a:active, a:visited
{
color:#000080;
font-size: 15px;
text-decoration:
none;
}

i.nav_element a
{
color:#FFFFFF;
display: block;
margin: 5px;
padding-left: 10px;
text-decoration: none;
width: 120px;
height: 20px;
background-image:url();
background-color:#FDC600;
}

li.nav_element a:hover
{
color:#000000;
display: block;
margin: 5px;
padding-left: 10px;
text-decoration: none;
width: 120px;
height: 20px;
background-image:url();
background-color:#F3EA8F}
* { padding: 0; margin: 0;
}

img { border:none }

#Testdesign2 {
margin: 0 auto;
width: 910px;}

#Header_oben {
color: #333;
width: 910px;
height: 240px;
float: left;
padding: 0px;
border: 0;
margin: 0px 0px 0px 0px;
background-image: url(http://s13.directupload.net/images/110115/42nq5b7u.jpg);}

#content {
background-image:url(http://s10.directupload.net/images/100607/fnf8722i.jpg);
color: #333;
border: 0;
margin: 0px 0px 0px 0px;
padding: 0px;
height: 442px;
width: 584px;
float: left;
overflow:auto;}

#nav_container {
float: left;
color: #333;
border: 0;
margin: 0px 0px 0px 0px;
padding: 0px;
height: 500px;
width: 210px;
display: inline;
background-image: url(http://s3.directupload.net/images/110115/zhcuv8fq.jpg);
}

#Streifen_unten {
width: 910px;
height: 113px;
clear: both;
color: #333;
border: 0;
background: #66FF00;
margin: 0px 0px 10px 0px;
padding: 0px;}

center

/center

text-align: center;