Hallo
Versuchs doch mal damit, evtl. ist das ein Ansatz. (position: absolute;)
<html>
<head>
<title>Unbenanntes Dokument</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css">
<!--
#Layer1 {
background-color: #000000;
}
#Layer3 {
background-color: #FF0000;
}
#Layer4 {
background-color: green;
}
-->
</style>
</head>
<body>
<div id="Layer1" style="position:absolute; width:526px; height:115px; z-index:1">header
<div id="Layer3" style="position:absolute; width:331px; height:57px; z-index:1; top: 58px; left: 0px;">main</div>
<div id="Layer4" style="position:absolute; width:196px; height:57px; z-index:2; left: 330px; top: 58px;">right</div>
</div>
</body>
</html>