rails form formatting for twitter bootstrap #1

bootstrap_style.html

<!-- without error -->
<div class="clearfix">
  <label for="bar">Bar</label>
  <div class="input">
    <input id="foo_bar" name="foo[bar]" size="30" type="text">
  </div>
</div>

<!-- with error -->
<div class="field">
  <div class="field_with_errors">
    <label for="foo_bar">Bar</label>
  </div><br>
  <div class="field_with_errors">
    <input id="foo_bar" name="foo[bar]" size="30" value="" type="text">
  </div>
</div>