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function make_cat_nav_tree($cur, $pgm='', $nav_class='nav', $topic_title='', $forum_id=0)
{
	global $phpbb_root_path, $phpEx, $db;
	global $global_orig_word, $global_replacement_word;
	global $nav_separator;
	global $tree;

	// get topic or post level
	$type = substr($cur, 0, 1);
	$id = intval(substr($cur,1));
	$fcur = '';
	switch ($type)
	{
		case POST_TOPIC_URL:
			if ( empty($forum_id) || empty($topic_title) )
			{
				$sql = "SELECT forum_id, topic_title
							FROM " . TOPICS_TABLE . " WHERE topic_id = $id";
				if ( !$result = $db->sql_query($sql) )
				{
					message_die(GENERAL_ERROR, 'Could not query topics information', '', __LINE__, __FILE__, $sql);
				}
				if ( $row = $db->sql_fetchrow($result) )
				{
					$topic_title = $row['topic_title'];
					$forum_id = $row['forum_id'];
				}
			}
			else
			{
				$row = array();
				$row['topic_title'] = $topic_title;
				$row['forum_id'] = $forum_id;
			}
			if ( !empty($forum_id) )
			{
				$fcur = POST_FORUM_URL . $row['forum_id'];
				$topic_title = $row['topic_title'];
				$orig_word = array();
				$remplacement_word = array();
				obtain_word_list($orig_word, $replacement_word);
				if ( count($orig_word) )
				{
					$topic_title = preg_replace($orig_word, $replacement_word, $topic_title);
				}
			}
			break;
		case POST_POST_URL:
			if ( empty($forum_id) || empty($topic_title) )
			{
				$sql = "SELECT t.forum_id, t.topic_title
							FROM " . POSTS_TABLE . " p, " . TOPICS_TABLE . " t
							WHERE t.topic_id=p.topic_id AND post_id = $id";
				if ( !($result = $db->sql_query($sql)) ) message_die(GENERAL_ERROR, 'Could not query posts information', '', __LINE__, __FILE__, $sql);
				if ( !$row = $db->sql_fetchrow($result) )
				{
					$row['forum_id'] = 0;
					$row['topic_title'] = '';
				}
			}
			else
			{
				$row['forum_id'] = $forum_id;
				$row['topic_title'] = $topic_title;
			}
			if ( !empty($forum_id) && !empty($topic_title) )
			{
				$fcur = POST_FORUM_URL . $row['forum_id'];
				$topic_title = $row['topic_title'];
				$orig_word = array();
				$remplacement_word = array();
				obtain_word_list($orig_word, $replacement_word);
				if ( count($orig_word) )
				{
					$topic_title = preg_replace($orig_word, $replacement_word, $topic_title);
				}
			}
			break;
	}

	// keep the compliancy with prec versions
	if (!isset($tree['keys'][$cur]))
	{
		$cur = isset($tree['keys'][POST_CAT_URL . $cur]) ? POST_CAT_URL . $cur : $cur;
	}

	// find the object
	$this = isset($tree['keys'][$cur]) ? $tree['keys'][$cur] : -1;

	$res = '';
	while (($this >= 0) || ($fcur != ''))
	{
		$type = (substr($fcur, 0, 1) != '') ? substr($cur, 0, 1) : $tree['type'][$this];
		switch($type)
		{
			case POST_CAT_URL:
				$field_name		= get_object_lang($cur, 'name');
				$param_type		= POST_CAT_URL;
				$param_value	= $tree['id'][$this];
				$pgm_name		= "index.$phpEx";
				break;
			case POST_FORUM_URL:
				$field_name		= get_object_lang($cur, 'name');
				$param_type		= POST_FORUM_URL;
				$param_value	= $tree['id'][$this];
				$pgm_name		= "viewforum.$phpEx";
				break;
			case POST_TOPIC_URL:
				$field_name		= $topic_title;
				$param_type		= POST_TOPIC_URL;
				$param_value	= $id;
				$pgm_name		= "viewtopic.$phpEx";
				break;
			case POST_POST_URL:
				$field_name		= $topic_title;
				$param_type		= POST_POST_URL;
				$param_value	= $id . '#' . $id;
				$pgm_name		= "viewtopic.$phpEx";
				break;
			default :
				$field_name		= '';
				$param_type		= '';
				$param_value	= '';
				$pgm_name		= "index.$phpEx";
				break;
		}
		if ($pgm != '') $pgm_name = "$pgm.$phpEx";

		if (!empty($field_name)) $res = '<a href="' . append_sid('./' . $pgm_name . (($field_name != '') ? "?$param_type=$param_value" : '')) . '" class="' . $nav_class . '">' . $field_name . '</a>' . (($res != '') ? $nav_separator . $res : '');

		// find parent object
		if ($fcur != '')
		{
			$cur	= $fcur;
			$pgm	= '';
			$fcur	= '';
			$topic_title = '';
		}
		else
		{
			$cur = $tree['main'][$this];
		}
		$this = isset($tree['keys'][$cur]) ? $tree['keys'][$cur] : -1;
	}

	return $res;
}