create dynamic main menu and sub menu using php and mysql

<?php
CREATE TABLE `menu` (
  `id` int(11) NOT NULL auto_increment,
  `label` varchar(50) NOT NULL default '',
  `link` varchar(100) NOT NULL default '#',
  `parent` int(11) NOT NULL default '0',
  `sort` int(11) default NULL,
  PRIMARY KEY  (`id`))
------------------------------------------------------------------------------------------------------
$mysql=mysql_connect('127.0.0.1','root','');
mysql_select_db('test',$mysql);
function display_menu($parent, $level) {
    $result = mysql_query("SELECT a.id, a.label, a.link, Deriv1.Count FROM `menu` a  LEFT OUTER JOIN (SELECT parent, COUNT(*) AS Count FROM `menu` GROUP BY parent) Deriv1 ON a.id = Deriv1.parent WHERE a.parent=" . $parent);
    echo "<ul>";
    while ($row = mysql_fetch_assoc($result)) {
        if ($row['Count'] > 0) {
            echo "<li><a href='" . $row['link'] . "'>" . $row['label'] . "</a>";
            display_menu($row['id'], $level + 1);
            echo "</li>";
        } elseif ($row['Count']==0) {
            echo "<li><a href='" . $row['link'] . "'>" . $row['label'] . "</a></li>";
        } else;
    }
    echo "</ul>";
}
display_menu(0, 1);
?>

how to set custom page title in wordpress

 how to set custom page title in wordpress
<?php
function add_custom_title() {


         <title>call bikash page title</title>


}
add_action('wp_head','add_custom_title');
?>