@Beat Darum geht es mir ja garnicht.
Hier mein Code:~~~css
<html>
<head>
<title>Dreispaltiges Layout mit Kopf- und Fußzeile</title>
<style type="text/css">
#Header_oben {
position: absolute;
left: 105px;
top: 40px;
height: 145px;
width: 800px;
background-color: #ffffff;
background-image:url();
color: #EBB000;
border: 1px solid #888888;
margin: 0px 0px 0px 0px;
padding: 0px;
float: left;}
body {background-color: #dddddd;background-image:url();}
a{color:#ff00cc; font-size: 15px; text-decoration: none;}
a:hover {color: #ff99ff; font-size: 15px; text-decoration: none;}
a:link {color: #ff00ff; font-size: 15px; text-decoration: none;}
a:active {color: #cc00cc; font-size: 15px; text-decoration: none;}
a:visited {color: #9900cc; font-size: 15px; text-decoration: none;}
#nav_container {
position: absolute;
left: 105px;
top: 186px;
width: 800px;
height: 52px;
background-color: #xxx;
color: #ff00cc;
border: 0px solid #888888;
margin: 0px 0px 0px 0px;
padding: 0px 0px 0px 0px;
float: left;overflow:auto;
background-image: url();}
#Textfeld {
position: absolute;
left: 105px;
top: 200px;
width: 610px;
background-color: #ffffff;
color: #ff00cc;
background-image: url();
border: 1px solid #888888;
margin-bottom: 50px;
padding: 10px 10px 0px 10px;
display: inline;
float: left;}
#sidebar_container {position: absolute;
left: 752px;
top: 200px;
width: 143px;
height: 450px;
background-color: #ffffff;
color: #ff00cc;
border: 1px solid #888888;
margin-bottom: 50px;
padding: 0px 0px 0px 0px;
float: left;overflow:auto;
background-image: url();}
#Feld_unten {
width: 780px;
background-color: #ffffff;
color: #ff00cc;
clear: both;
border: 1px solid #888888;
padding: 10px;}
</style>
</head>
<body>
<div id="Header_oben">Der Header</div>
<div id="nav_container"></div>
<div id="sidebar_container">Hier die rechten Boxen</div>
<div id="Textfeld">Lorem ipsum</div>
<div id="Feld_unten">Hier die Fußzeile</div>
</body>
</html>