add tags and categories to pages like with posts

Hi I would like to add the same tags and categories to my pages like I have on my posts. Then on my main menu I use the categories and both my page/posts that relate to that category automatically show when a user clicks on the category listing in the menu. This is what i tried. 1) add to functions.php 2) added custom field to page. Neither tag nor category is associated to pages yet. // add tag support to pages function tags_support_all() { register_taxonomy_for_object_type('post_tag', 'page'); } // ensure all tags are included in queries function tags_support_query($wp_query) { if ($wp_query->get('tag')) $wp_query->set('post_type', 'any'); } // tag hooks add_action('init', 'tags_support_all'); add_action('pre_get_posts', 'tags_support_query'); On each page added query_args (custom field name) cat=id of category (argument) so if category is "great stuff" and id is 3 i added cat="3" Appreciate any assistance. Thanks. Martha