I am building a navigation menu which lists all my categories and subcategories. The problem is it returns only one of these and not all. I have the categories echoed inside the while loop so I'm not sure why it's only showing one result and not all:

<?php

$query = mysql_query("SELECT * FROM categories_parent");

while ($row = mysql_fetch_assoc($query)) {

    $id = $row['id'];
    $name = $row['name'];
    $slug = $row['slug'];
    $childStatus = $row['child_status'];

    // if has child categories
    if ($childStatus == "1") {
        echo "<li class='dir'><a href='category.php?slug=$slug'>$name</a>";
        echo "<ul id='dropdown'>";

            $query = mysql_query("SELECT * FROM categories_child WHERE parent=$id");
            while ($row = mysql_fetch_assoc($query)) {
                $id   = $row['id'];
                $name = $row['name'];
                $slug = $row['slug'];

                echo "<li><a href='category.php?slug=$slug'>$name</a></li>";
            }

        echo "</ul>";
        echo "</li>";
    }
    // if singular parent
    else {
        echo "<li><a href='category.php?slug=$slug'>$name</a></li>";
    }

}

?>

My database tables:

--
-- Table structure for table `categories_child`
--

CREATE TABLE IF NOT EXISTS `categories_child` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(1000) NOT NULL,
  `slug` varchar(1000) NOT NULL,
  `parent` int(11) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=139 ;

--
-- Dumping data for table `categories_child`
--

INSERT INTO `categories_child` (`id`, `name`, `slug`, `parent`) VALUES
(138, 'Britney Spears', 'category/celiberties/britney-spears/', 137),
(136, 'Tigers', 'category/animals/tigers/', 136),
(137, 'Horses', 'category/animals/horses/', 136),
(135, 'Lions', 'category/animals/lions/', 136);

--
-- Table structure for table `categories_parent`
--

CREATE TABLE IF NOT EXISTS `categories_parent` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(1000) NOT NULL,
  `slug` varchar(1000) NOT NULL,
  `child_status` int(1) NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=139 ;

--
-- Dumping data for table `categories_parent`
--

INSERT INTO `categories_parent` (`id`, `name`, `slug`, `child_status`) VALUES
(137, 'Celiberties', 'category/celiberties/', 1),
(138, 'TV Shows', 'category/tv-shows/', 0),
(136, 'Animals', 'category/animals/', 1);