penjumlahan

    <table>
      <tr>
        <td>
          <input id='harga_1' />
        </td>
        <td>
          <input id='jml_1' />
        </td>
        <td>
          <input id='tot_1' />
        </td>
      </tr>
      <tr>
        <td>
          <input id='harga_2' />
        </td>
        <td>
          <input id='jml_2' />
        </td>
        <td>
          <input id='tot_2' />
        </td>
      </tr>
    </table>
<input id='total_all' >