Menu Horizontal Multi Level Menggunakan jQuery & PHP

<ul>
    <li><a href="menu1.html">Menu 1</a></li>
    <li><a href="menu2.html">Menu 2</a></li>
    <li><a href="menu3.html">Menu 3</a>
        <ul>
            <li><a href="menu31.html">Sub Menu 3.1</a></li>
            <li><a href="menu32.html">Sub Menu 3.2</a>
                <ul>
                    <li><a href="menu321.html">Sub Menu 3.2.1</a></li>
                    <li><a href="menu322.html">Sub Menu 3.2.2</a></li>
                    <li><a href="menu323.html">Sub Menu 3.2.3</a></li>
                </ul>
            </li>
            <li><a href="menu33.html">Sub Menu 3.3</a></li>
        </ul>
    </li>
    <li><a href="menu4.html">Menu 4</a></li>
</ul>

<link rel="stylesheet" type="text/css" href="jquerycssmenu.css" />
 
<script type="text/javascript" src="jquery-1.3.2.min.js"></script>
<script type="text/javascript" src="jquerycssmenu.js"></script>

CREATE TABLE `menu` (
  `id` tinyint(3) UNSIGNED NOT NULL AUTO_INCREMENT,
  `parent_id` tinyint(3) UNSIGNED NOT NULL DEFAULT '0',
  `title` VARCHAR(100) NOT NULL DEFAULT '',
  `url` VARCHAR(100) NOT NULL DEFAULT '',
  `menu_order` tinyint(3) UNSIGNED NOT NULL DEFAULT '0',
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM;

<?php
function get_menu($data, $parent = 0) {
	static $i = 1;
	$tab = str_repeat("\t\t", $i);
	if (isset($data[$parent])) {
		$html = "\n$tab<ul>";
		$i++;
		foreach ($data[$parent] as $v) {
			$child = get_menu($data, $v->id);
			$html .= "\n\t$tab<li>";
			$html .= '<a href="'.$v->url.'">'.$v->title.'</a>';
			if ($child) {
				$i--;
				$html .= $child;
				$html .= "\n\t$tab";
			}
			$html .= '</li>';
		}
		$html .= "\n$tab</ul>";
		return $html;
	} else {
		return false;
	}
}
 
mysql_connect('localhost', 'root', '');
mysql_select_db('tes');
 
$result = mysql_query("SELECT * FROM menu ORDER BY menu_order");
while ($row = mysql_fetch_object($result)) {
	$data[$row->parent_id][] = $row;
}
 
$menu = get_menu($data);
?>