Split header in a 3 column layout

Hey guys,

 I'm trying to accomplish a layout with a 160 x 160 div at the top left for a flash spinning logo. the layout is centered in the middle of page and is a three column layout. Here is a picture of what I'm trying to accomplish [www.3danomaly.com/css/layout.html](http://www.3danomaly.com/css/layout.html) 

Thats also the page I’m working on.

Here is my code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Delineations</title>

<style type="text/css">
<!--
body {
    width: 950px;
    margin-top: 0px;
    margin-right: auto;
    margin-bottom: 0px;
    margin-left: auto;
    background-image: url(images/scanlines5.gif);
    background-color: #000000;
}
.header {
    background-color: #CCCCCC;
    width: 950px;
    height: 160px;
    padding: 0px;
    margin: 0px;
}
.left_column {
    width: 155px;
    height: 610px;
    float: left;
    background-color: #232323;
    padding: 5px;
    background-image: url(images/left_sidebar.jpg);
}
.right_column {
    width: 155px;
    height: 610px;
    float: right;
    background-color: #FFFFCC;
    padding: 5px;
    background-image: url(images/right_sidebar.jpg);
}
.main_content {
    width: 610px;
    height: 610px;
    float: right;
    background-color: #232323;
    padding: 5px;
}
.footer {
    width: 950px;
    height: 94px;
    background-color: #000000;
    clear: right;
    padding: 0px;
}

-->
</style>
</head>
<body>
<div class="header"><img src="images/header.jpg" alt="Header" width="950" height="160" /></div>

<div class="left_column">left column
</div>

    
<div class="right_column">
        right column
    </div>
    <div class="main_content">
      <img src="images/layout.jpg" alt="Layout" width="600" height="600" />
</div>
        
<div class="footer">
        <img src="images/footer.jpg" alt="footer" width="950" height="94" />    </div>
    
    
</body>
</html>

Any help would be appreciated,

Nuvis