4行五列的窗体TABLE布局

四行顶五列
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<table width="90%" border="1" align="center">
  <tr>
    <th width="50%" scope="col">&nbsp;</th>
    <th width="50%" scope="col">&nbsp;</th>
    <th width="100%" scope="col">&nbsp;</th>
    <th width="100%" scope="col">&nbsp;</th>
    <th width="100%" scope="col">&nbsp;</th>
  </tr>
  <tr>
    <td colspan="5">&nbsp;</td>
  </tr>
  <tr>
    <td colspan="5">&nbsp;</td>
  </tr>
  <tr>
    <td colspan="5">&nbsp;</td>
  </tr>
</table>
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