<div style="float:left; border:1px solid Wheat; 200px; height:500px; margin-right:10px;">左</div>
<div style="float:left; border:1px solid Wheat; 200px; height:300px; margin-right:10px;">中</div>
<div style="float:left; border:1px solid Wheat; 200px; height:400px; margin-right:10px;">右</div>