drupal: remove system css files

gistfile1.php

<?php 

/* Add this to themes template.php */

function THEME_NAME_css_alter(&$css)
{
    unset($css[drupal_get_path('module', 'system').'/system.theme.css']);
    unset($css[drupal_get_path('module','system').'/system.base.css']);
    unset($css[drupal_get_path('module', 'system').'/system.messages.css']);
    unset($css[drupal_get_path('module', 'comment').'/comment.css']);
    unset($css[drupal_get_path('module', 'field').'/theme/field.css']);
    unset($css[drupal_get_path('module', 'mollom').'/mollom.css']);
    unset($css[drupal_get_path('module', 'node').'/node.css']);
    unset($css[drupal_get_path('module', 'search').'/search.css']);
    unset($css[drupal_get_path('module', 'user').'/user.css']);
    unset($css[drupal_get_path('module', 'views').'/css/views.css']);
    unset($css[drupal_get_path('module', 'ctools').'/css/ctools.css']);
    unset($css[drupal_get_path('module', 'panels').'/css/panels.css']);
}