codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>superpelo</title>
<style type="text/css">
#head, #footer {clear:both;width:700px;height:100px;border:1px solid green;}
#sinistro, #destro {float:left;width:150px;height:250px;border:1px solid green;}
#centrale {float:left;width:396px;height:250px;border:1px solid green;text}
#intSX, #intDX {float:left;width:170px;height:150px;border:1px solid red;margin-top:20px;}
#intUnder {clear:both;width:342px;height:50px;border:1px solid red;}
</style>
</head>
<body>
<div id="head"></div>
<div id="sinistro"></div>
<div id="centrale">
<div id="intSX"></div>
<div id="intDX"></div>
<div id="intUnder"></div>
</div>
<div id="destro"></div>
<div id="footer"></div>
</body>
</html>
Con beneficio d'inventario, ovvero poi dipende da cosa e come è strutturato il tuo lavoro