div布局整理
======================上下两行四个区域布局=====================
其中:div{border:0px;margin:0px;}<div style="clear:both;width:100%;"> <div style="width:50%;float:left;">left1</div> <div style="width:50%;float:right;">right1</div></div><div style="clear:both;width:100%;"> <div style="width:50%;float:left;">left2</div> <div style="width:50%;float:right;">right2</div></div>