When a drupal form fails validation, it is redrawn with the elements that failed validation surrounded in a red border. Drupal does this by adding the error class to the input elements, and specifing a 2px red border on input.error elements in system.css.
Without modifying this stylesheet, how can I remove the red border on a specific form only, while using the default behavior on the rest of the site?
I believe the solution might require using a custom theme_form_element, but I can't figure out how to customize a single form only.
Note that I would like to do this without having to resort to this jQuery trick (which does work):
$("#edit-name").removeClass('error');
You will need to remove the error class from the form items. This can be done by overwriting the theme functions, in theme_textfield, theme_textarea ... (there is one for each type)
Take a look at $element['#attributes']['class'] which contains the error class.
EDIT
To do it for a specific form element or form you can use the #theme attribute or either form or element you want to change the theming function for.