Given the following HTML form (fragment):

<fieldset id="timesheet-rows">
    <legend>Add Entries</legend>

    <div id="timesheetrow-0" class="timesheet-row">
      <label for="project-0">Project</label>
      <select id="project-0" name="project-0" required>
        <option value="" />
      </select>

      <label for="department-0">Department</label>
      <select id="department-0" name="department-0" required>
        <option value="" />
      </select>

      <label for="task-0">Task: </label>
      <select id="task-0" name="task-0" required>
        <option value="" />
      </select>

      <label for="hours-0">Hours: </label>
      <input type="number" step="0.25" id="hours-0" name="hours-0" width="1" placeholder="2.0" required />

      <label for="comment-0">Comment: </label>
      <input type="text" id="comment-0" name="comment-0" width="50" />
    </div>

    <input type="button" id="add-row" name="add-row" value="Add row" />

  </fieldset>

I have implemented the following jQuery (fragment) to clone each 'timesheet row' <div /> along with the <label /> tags, which are not caught by $(':input'):

$(document).ready(function() {

  var current_id = 0;
  $('#add-row').click(function(){
    next_element($('#timesheetrow-0'));
  })

  function next_element(element){
    var new_element = element.clone(),
        id = current_id + 1;
    current_id = id;
    new_element.attr("id",element.attr("id").split("-")[0]+"-"+id);

    // Ajuster les `id` et `name` dans les <input />s et <select />s
    $(':input', new_element).each(function(){
      var field_id = $(this).attr("id"),
          field_name = $(this).attr("name");
      $(this).attr("id", field_id.split("-")[0]+"-"+id );
      $(this).attr("name", field_name.split("-")[0]+"-"+id );
    });

    // Ajuster le for="" dans les <label />s
    $('label', new_element).each(function(){
      field_for = $(this).attr("for");
      $(this).attr("for", field_for.split("-")[0]+"-"+id );
    });
    new_element.appendTo($("#timesheet-rows"));
  };
});

(Above jQuery was inspired by http://jsfiddle.net/32RgL/ ).

Is there a more elegant or complete way of doing this?