probá así:
Código HTML:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<style>
body {
margin:auto;
padding: 0 0 0 0;
font-size:80%;
text-align:center;
}
#content {
text-align:left;
background-color:#ff0;
width:800px;
height:800px;
}
#cabecera {
width: 800px;
height:100px;
margin:auto;
background-color:#f00;
}
#menu {
width:150px;
height:650px;
float:left;
background-color:#888;
}
#contenido {
width:650px;
height:650px;
float:left;
background-color:#ccc;
}
#pie {
clear:both;
width:800px;
height:50px;
background-color:#0f0;
}
</style>
<html>
<head>
<title>Prueba</title>
</head>
<body>
<div id="content">
<div id="cabecera"></div>
<div id="menu"></div>
<div id="contenido"></div>
<div id="pie"></div>
</div>
</body>
</html> 
DX