Versuche den mal
<style type="text/css">
<!--
/* Nullformatierung für alle Browser */
*{margin:0px; padding:0px;}
/* Hintergrund hinter Design */
body {
background-color:#000033;
background-image:url();
background-repeat:repeat-x; }
/* Container Hintergrund */
#container {
width:980px;
margin: auto;
background-color:#0000FF;
border: 2px solid #c9c9c9;
overflow: hidden; }
/* Header oben */
#header_container {
margin-top:10px;
width:940px;
height:148px;
background-image: url(http://img.webme.com/pic/s/schweden-hemsidan/header7ab.jpg);
border: 1px solid #ffffff;}
/* Feld der Navigation */
#nav_container {
width:940px;
text-align: center;
margin-top:10px;
margin-bottom:10px;
border: 0px solid #c9c9c9; }
/* Navi-Buttons */
li.nav_element {
list-style-type: none;
display: inline-block;
text-align: center;
margin-left:10px; /*Button-Abstand nach Links */
margin-right:10px; /* Button-Abstand nach Rechts */
width:90px !important;
padding:5px;
background-color: ;
background-image:url();
border: 0px solid #898989; }
/* Navi Buttons Hover-Effekt */
li.nav_element:hover {
background-color: ;
background-image: url(http://img.webme.com/pic/s/schweden-hemsidan/bution3.jpg); }
/* Navi Textlinks */
li.nav_element a {
font-size:12px;
color: #FFFFFF;
font-family: arial;
text-decoration: none;}
/* aktuell besuchte Seite */
li.checked menu {
background-color:;
background-image: url();}
#content {
margin-top: 10px;
margin-bottom: 20px;
width:900px;
padding: 20px;
color: #000000;
font-size:14px;
font-family: arial;
text-align: left;
background-color:#CADBEB;
border: 1px solid #c9c9c9; }
/* Linkfarbe + Linkgröße im Textfeld */
#content a {
color: #000080;
font-size: 14px;
font-family: arial; }
/* nicht verwendete Box entfernt mit */
#sidebar_container {display: none; }
/* Balken unten (Footer) */
#unten {
width: 960px;
color: #FFFFFF;
font-size: 14px;
padding: 10px;
margin-top: 10px;
margin-bottom: 50px;
background-color: #0000FF;
border: 2px solid #c9c9c9; }
/*unnötige Elemente entfernt */
#pre_content {display:none;}
#pre_header {display:none;}
div.header{display: none;}
#post_header {display:none;}
#post_content {display:none;}
#below_content {display:none;}
#extraDiv1 {display:none;}
#extraDiv2 {display:none;}
#extraDiv3 {display:none;}
#extraDiv4 {display:none;}
#extraDiv5 {display:none;}
#extraDiv6 {display:none;}
#counter {display:none;}
h1#header {display:none;}
h2#title {display:none;}
#nav_heading {display:none;}
#sidebar_heading {display:none;}
-->
</style>[/code]
Also wo ich es getestet habe gings. Hier kannst es sehen.
http://test-webseite.de.tl/G.ae.stebuch.htm