th="100%">
      <tbody>
        <tr valign="top">
          <td width="50%" id="vc">
            Vertical container example:
          </td>
          <td width="50%" id="hc">
            Horizontal container example:
          </td>
        </tr>
        <tr valign="top">
          <td>
            <label>
              Show vertical container:
              <input type="checkbox" id="show_vc" checked>
            </label>
            &nbsp;
            <label>
              Enable vertical container:
   