Sådan noget som dette ?-)
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 strict//EN" "
http://www.w3.org/TR/html401/strict.dtd"><html>
<head>
<title>Fuld højde centreret simpelt</title>
<meta name="keywords" content="roenving,
http://www.eksperten.dk/spm/520876"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css">
html,body{height:100%;margin:0px;padding:0px;text-align:center;}
#container{position:relative;height:100%;width:512px;margin:0px auto;text-align:left;}
#banner{position:absolute;height:125px;width:100%;background:yellow;z-index:1;}
#top1{width:100%;height:50px;background:#770;}
#top2{width:100%;height:75px;background:#707;}
#main{height:100%;background:green;}
#spacer{height:125px;}
#bottom{position:absolute;left:0px;bottom:0px;height:125px;width:100%;background:yellow;z-index:1;}
#bund1{width:100%;height:25px;background:#770;}
#bund2{width:100%;height:100px;background:#707;}
</style>
</head>
<body>
<div id="container">
<div id="banner">
<div id="top1">top1</div>
<div id="top2">top2</div>
</div>
<div id="main">
<div id="spacer">Usynligt</div>
Hovedside</div>
<div id="bottom">
<div id="bund1">bund1</div>
<div id="bund2">bund2</div>
</div>
</div>
</body>
</html>