.content.itemDiv{ display: table-cell;width: 171px;height: 133px;text-align: center; vertical-align: middle; background:url(../images/itembg2.png) no-repeat center;padding: 11px;}
<div class="content">
<div class="itemDiv">
<img src="images/item1.png">
</div>
<div class="itemDiv">
<img src="images/item4.png">
</div>
<div class="itemDiv">
<img src="images/item2.png">
</div>
<div class="itemDiv">
<img src="images/item3.png">
</div>
<div class="itemDiv">
<img src="images/item5.png">
</div>
</div>
原文：http://www.cnblogs.com/as3lib/p/4610212.html