2 lefti

<div id="head"></div>

<div id="right1"></div>

<div id="right2"></div>

<div id="left">

  <div id="left2"></div>

</div>

#head{height:200px;background:blue;}

#right1,#right2{float:right;width:200px;height:300px;}

#right1{background:red;}

#right2{background:green;}

#left{background:orange;overflow:hidden;}

#left2{height:400px;background:orange}