横向添充,够N列换行

<table width="500" border="1" cellspacing="0" cellpadding="3">
    <tr>
    <{section name=sec1 loop=$my_array}>
        <td><{$my_array[sec1].value}></td>
    <{if $smarty.section.sec1.rownum is div by 2}>
    </tr>
    <tr>
    <{/if}>
    <{/section}>
    </tr>
</table>