highlighting parent of current_page_parent in 4-level menu list

Hello hello.

Had a good thorough search in the Codex and on Google for a solution to this, but not seen a squeak on it.

Is there a technique to make the PARENT of the CURRENT PAGE’S PARENT highlighted in a 4-level page menu? I’m talking grand-parents and great-grand-parents. I want the page item to hover red before being selected, stay red when selected, and stay red when its child and child’s child are selected.

Currently I have my css in this format (it is very unwieldy, and I’ve stripped out the non-relevant code):

/*sidebar list level1 */
#sidebar ul {}
#sidebar ul li {}

/*sidebar list level2 */
#sidebar ul li ul {}
#sidebar ul li ul li {}

#sidebar ul li ul li.current_page_item a, #sidebar ul li ul li.current_page_parent a {
color:red
}

/*sidebar list level3 */
#sidebar ul li ul li ul {}
#sidebar ul li ul li ul li.page_item a {}

#sidebar ul li ul li ul li.page_item a:hover, #sidebar ul li ul li ul li.current_page_item a, #sidebar ul li ul li ul li.current_page_parent a {
color:red
}

/*sidebar list level4 */
#sidebar ul li ul li ul li ul {}
#sidebar ul li ul li ul li ul li.page_item a {}

#sidebar ul li ul li ul li ul li.page_item a:hover, #sidebar ul li ul li ul li ul li.current_page_item a, #sidebar ul li ul li ul li ul li.current_page_parent_parent a {
color:red
}

—

The highlighting of current page parents works for two levels, but not three or four. I’ve tried many permutations of current_page_parent, page_parent etc, but none of it reaches back far enough.

The html/php is:

<?php
global $notfound;
if (is_page() and ($notfound != ‘1’)) {
$current_page = $post->ID;
while($current_page) {
$page_query = $wpdb->get_row(“SELECT ID, post_title, post_status, post_parent FROM $wpdb->posts WHERE ID = ‘$current_page'”);
$current_page = $page_query->post_parent;
}
$parent_id = $page_query->ID;
$parent_title = $page_query->post_title;

// if ($wpdb->get_results(“SELECT * FROM $wpdb->posts WHERE post_parent = ‘$parent_id’ AND post_status != ‘attachment'”)) {
if ($wpdb->get_results(“SELECT * FROM $wpdb->posts WHERE post_parent = ‘$parent_id’ AND post_type != ‘attachment'”)) {
?>

• <h4 class=”sidebartitle”><?php _e(‘PAGES MENU/LIST’); ?></h4>
  <ul class=”list-page”>
  <?php wp_list_pages(‘sort_column=menu_order&title_li=&child_of=’. $parent_id); ?>

<?php comments_template(); ?>
<?php } } ?>

Any ideas, anyone?