var cell_2 = row.insertCell(1);
        var el = document.createElement('select');
        el.setAttribute('lenght', '2');
        el.setAttribute('name', 'thema_aktion' + rowNum);
        el.setAttribute('id', 'row_name_id' + rowNum);
        el.setAttribute('size', '1');
        var opt = document.createElement('option');
        opt.setAttribute('option', 'I');
        cell_2.appendChild(el);
        cell_2.appendChild(opt);