定义两个不同的样式控制如下所示:

<style>

.newsListWTD{ background:#ffffff; height:30px; width:auto;}
.newsListBTD{ background:#f5f5f5; height:30px; width:auto;}

</style>

把下面代码放到标签循环体

<tr>
      <td class="newsListBTD">&nbsp;</td>
      <td  class="newsListBTD"><a target="_blank" href='ShowNews-42|58|68-19428.html'><span class="font12B">文章标题文章标题文章标题文章标题文章标题文章标题文章标题</span></a></td>
      <td  align="center" class="newsListBTD"><span class="fontC1c1c1">2010-4-8 16:00:09</span></td>
    </tr>
   
     <tr>
      <td class="newsListWTD">&nbsp;</td>
      <td  class="newsListWTD"><a target="_blank" href='ShowNews-42|58|68-18961.html'><span class="font12B">文章标题文章标题文章标题文章标题文章标题文章标题</span></a></td>
      <td  align="center" class="newsListWTD"><span class="fontC1c1c1">2010-3-24 16:14:32</span></td>
    </tr>