Più o meno dovrebbe andare...
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>quadro 1</title>
<style>
#quadrosinistra{
width: 600px;
float: left;
background-color: #f00;
}
#quadrodestra{
background-color: #dd0;
float: right;
}
#uno{
width:448px;
\width:438px;
w\idth:448px;
height: 130px;
margin:4px;
}
#due{
float:left;
width:220px;
\width:210px;
w\idth:220px;
margin-right:4px;
height: 130px;
}
#tre{
width:220px;
\width:210px;
w\idth:220px;
height: 130px;
}
#quattro{
width:448px;
\width:438px;
w\idth:448px;
height: 130px;
margin-top:4px;
}
#cinque{
float:right;
width:400px;
\width:400px;
w\idth:400px;
height: 270px;
margin-right: 30px;
}
#sei{
float:right;
width:400px;
\width:400px;
w\idth:400px;
height: 130px;
margin-right: 30px;
}
.generale{
background-color: #f3d;
border: 1px solid #DCDCDC;
padding: 2px;
}
</style>
</head>
<body>
<div>
<div id="quadrosinistra">
<div id="uno" class="generale">quadro 1</div>
<div id="due" class="generale">quadro 2</div>
<div id="tre" class="generale">quadro 3</div>
<div id="quattro" class="generale">quadro 4</div>
</div>
<div id="quadrodestra">
<div id="cinque" class="generale">quadro 5</div>
<div id="sei" class="generale">quadro 6</div>
</div>
</div>
</body>
</html>
CIao