SOURCE

<div id="a">
  <div id="b">这里是页头</div>
    <div id="c">
      <div id="d">mainbox</div>
      <div id="e">cebiankuang</div>
   </div>
  <div id="oip">yejiao</div>
</div>

body{
  font-size:20px;
}
#a{
  margin:0 auto;
  width:800px;
}
#b{
  height:50px;
  width:800px;
  background:#f96;
  margin-bottom:5px;
}
#c{
  width:800px;
  height:200px;
  margin-bottom:5px;
}
#d{
  float:left;
  height:200px;
  width:595px;
 
  background-color:wheat;
}
#e{
  float:right;
  width:200px;
  height:200px;
  background:#fc6;
}
#oip{
  width:900px;
  height:50px;
  background-color:powderblue;

}