.top{height:100px;background:blue;}
.main{width:800px;height:600px;background:#ccc;margin:0 auto;}
.left{width:200px;height:600px;background:green;float:left;}
.right{width:600px;height:600px;background:#CCC;float:right;}
.1{width:200px;height:600px;background:yellow;float:left;}
.2{right:400px;height:600px;background:blue;float:right;}
</style>
</head>
<body>
<div class="top"></div>
<div class="main">
<div class="left">
</div>
<div class="right">
<div class="1"></div>
<div class="2"></div>
</div>
stone310