Lücke zwischen Content und Navi

/* Nullformatierung für alle Browser */
*{padding: 0px; margin: 0px; }

/* Werbung mittig */
table[height="102"] { margin: auto; }

/* Hintergrund hinter Design */
body {
background-color: #000000;
background-image: url();
font-family: arial;
font-size: 14px;
color: #000000; }


/* Design-Container */
#container {
margin: 0px auto;
width: 962px;
overflow: hidden; }

/* Headerfeld 960 x 120 */
#header_container {
width: 960px;
height: 200px;
margin-bottom: 10px;
background-color: #FFFFFF;
background-image: url(http://i41.tinypic.com/t4zqit.png);
border: 0px solid #c9c9c9; }

/* Titel im Headerfeld entfernt */
h1#header {display: none; }

/* Feld der Navigation */
#nav_container {
width: 142px;
float: right;
margin-bottom: 10px;
margin-left: 0px;
overflow: hidden;
border: 1px solid #A90000;
min-height: 600px; }

/* Titel über Navigation entfernt */
#nav_heading {display: none; }

/* Aufzählungspunkte in Navi entfernt */
ul#nav {
list-style-type: none; }

/* Navi-Buttons */
li.nav_element {
width: 130px;
height: 30px;
padding-left: 10px;
margin-bottom: 0px;
border-bottom: 1px solid #A90000;
background-color: #000000;
background-image: url(); }

/* Hover Navi-Button */
li.nav_element:hover { background-color: #000000; }

/* Linktexte in Navigation */
li.nav_element a {
display: block;
font-size: 13px;
color: #A90000;
line-height: 30px;
text-decoration: none; }

/* Hover Linktexte Navigation */
li.nav_element a:hover { color: #A90000; }

/* aktuell offene Seite */
li.checked_menu {background-color: #000000; }

/* Feld um Seiteninhalt + Box */
#content_container {
width: 800px;
float: left;
overflow: hidden; }

/* Seiteninhalt */
#content {
margin-left: 0px;
margin-right: 0px;
float: right;
width: 556px;
color: #A90000;
min-height: 562px;
max-height: 562px;
padding: 20px 20px 20px 20px;
background-color: #000000;
background-image: url();
border-top: 1px solid #A90000;
border-bottom: 1px solid #A90000;
overflow: auto;}

/* Titel Seiteninhalt + Titel über Box */
h2#title , #sidebar_heading {display: none; }

/* Linktexte Inhalt + Box */
#content a, #sidebar_content a {color: #A90000; }

/* Hover Linktexte Inhalt + Box */
#content a:hover, #sidebar_content a:hover {color: #A90000; }

/* Rechte Box */
#sidebar_container {
float: left;
width: 160px;
max-height: 562px;
min-height: 562px;
color: #A90000;
padding: 20px 20px 20px 20px;
background-color: #000000;
background-image: url();
border: 1px solid #A90000;
overflow: hidden; }

/* unnötige Felder im Design entfernt */
#pre_header {display:none;}
#post_header {display:none;}
#post_content {display:none;}
#below_content{display:none;}
#counter{display:none;}

#test {
margin: auto;
background-image: url(http://i41.tinypic.com/15gti7k.png);
height: 192px;
width: 960px;
border-left: 1px solid #A90000;
border-right: 1px solid #A90000;
margin-top: -10px;
}

#nav_container {
    border: 1px solid #A90000;
    float: right;
    margin-bottom: 10px;
    margin-right: 15px;
    min-height: 600px;
    overflow: hidden;
    width: 142px;
}