Confirmation form to revert a database style to its default.
function image_style_revert_form($form, &$form_state, $style) {
$form_state['image_style'] = $style;
return confirm_form($form, t('Revert the %style style?', array(
'%style' => $style['label'],
)), 'admin/config/media/image-styles', t('Reverting this style will delete the customized settings and restore the defaults provided by the @module module.', array(
'@module' => $style['module'],
)), t('Revert'), t('Cancel'));
}