-----------------------方法1--------------------------------------------------------------
<table border="0" cellpadding="0" style="border-collapse: collapse" width="100%">
         <tr>
                 <td>广告代码1</td>
                 <td>广告代码2</td>
         </tr>
</table>

-----------------------方法2------------------------------------------------------------------

<table border="0" width="100%">
         <tr>
                 <td>广告1</td>
                 <td>广告1</td>
         </tr>
</table>

-----------------------广告居左-------------------------------------------------------------
<p align="left">广告代码</p>

-----------------------方法3------------------------------------------------------------------
<div style="height:250px; width:480px; background-color:#EEF5F4; margin-bottom:5px; padding:8px; text-align:center;">
   <!-- 左边文字广告开始 -->
   <div style="width:250px; height:250px; float:left; padding:10px 0 0 10px; line-height:22px; text-align:left; background-color:#FFFFFF;">

   广告代码1
                     </div>
   <!-- 左边文字广告结束 -->
   <!-- 右边文字广告开始 -->
   <div style="width:120px; height:250px; float:right; text-align:center;">
   广告代码2
   </div></div>
   <!-- 右边文字广告结束 -->