产品列表改变行数，大小问题，代码以列出，高手看看，谢谢

代码如下： 现在是五列，图片有点小，    高手帮看看，怎么改，改成四列，图片大些。谢谢<?php include_once("head.php");?>
   <script type="text/javascript" src="../../jquery.js"></script>
 <SCRIPT src="../../js/base.js" type=text/javascript></SCRIPT>
<body>
<div align="center">
  <table width="985" border="0" cellspacing="0" cellpadding="0">
    <tr>
      <td bgcolor="#F6F2E7"><?php include_once("top.php");?></td>
    </tr>
    <tr>
      <td height="413" valign="top" bgcolor="#F6F2E7"><table width="985" border="0" cellspacing="0" cellpadding="0">
        <tr>
          <td width="243" height="555" valign="top"><?php include_once("left.php");?></td>
          <td align="center" valign="top"><table width="719" border="0" cellspacing="0" cellpadding="0">
            <tr>
              <td height="26" background="images/pro.jpg"><table width="719" border="0" cellspacing="0" cellpadding="0">
                <tr>
                  <td width="82" align="center" class="zi12">产品展示</td>
                  <td width="637" align="right">&nbsp;</td>
                </tr>
              </table></td>
            </tr>
            <tr>
              <td height="522" align="center" valign="top"><br />
                <table width="100%" border="0" cellspacing="0" cellpadding="0">
                <tr>
                  <td height="70" colspan="2" align="left" valign="top" class="zi4"><?=cp_show(base64_decode($_GET["temp_cpid"]))?></td>
                  </tr>
              </table>
                  <br /></td>
            </tr>
          </table></td>
        </tr>
      </table></td>
    </tr>
    <tr>
      <td height="98" align="center" background="images/bottom_bg.jpg" bgcolor="#F6F2E7"><?php include_once("bottom.php");?></td>
    </tr>
  </table>
</div>
</body>
</html>