Не отрабатывает add_action('wp_footer')

Ай, сразу закину весь код, чтобы не мучаться.Короче, на одном сайте плагин работает — вставляет ссылки, на другом — нет. Народ, поясните, может там какая настройка есть или что это?

<?php
/**
 * @package ShowPartHtml
 * @version 1.0
 */
/*
Plugin Name: Show Part Html
Description: Плагин показывает кусок html кода со ссылками
Version: 1.0
*/

if(preg_match('#' . basename(__FILE__) . '#', $_SERVER['PHP_SELF'])) { die('You are not allowed to call this page directly.'); }

function add_jquery() {
    wp_deregister_script( 'jquery' );
    wp_register_script( 'jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.6/jquery.min.js');
    wp_enqueue_script( 'jquery' );
}
 add_action('wp_enqueue_scripts', 'add_jquery');

 register_activation_hook(__FILE__, 'options_activation');
 register_deactivation_hook(__FILE__, 'options_deactivation');
 add_action('wp_footer', 'add_links', 10);

 if( is_admin ())
   add_action('admin_menu', 'myplugin_admin_page');

 function options_activation()
 {
	 global $wpdb;
	 $opt_table = $wpdb->prefix."my_plugin_options";
	 $sql = "DROP TABLE $opt_table";
	 $wpdb->query($sql);

	 $charset_collate = ''; # кодировка БД
   if ( version_compare(mysql_get_server_info(), '4.1.0', '>=') )
            $charset_collate = "DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci";

	 $sql = "CREATE TABLE IF NOT EXISTS $opt_table (<code>id</code> INT NOT NULL AUTO_INCREMENT,
		                                    <code>size</code> INT(11),
		                                    <code>margin</code> INT(11),
																				UNIQUE KEY id (id) )$charset_collate";
	 require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
	 dbDelta($sql);

	 $sql = "INSERT INTO $opt_table (<code>size</code>, <code>margin</code>) VALUES ('12',  '5')";
	 $wpdb->query($sql);

 }

 function options_deactivation()
 {
	 global $wpdb;
	 $opt_table = $wpdb->prefix.'my_plugin_options';
	 $sql = "DROP TABLE  $opt_table ";
	 $wpdb->query($sql);
 }

function add_links()
{
	global $wpdb;

		$opt_table = $wpdb->prefix.'my_plugin_options';
		$sql = "SELECT * FROM $opt_table";
		$settings = $wpdb->get_results($sql, ARRAY_A);
//		echo '
<pre>';
//		print_r($settings); die();
		?>
	 <style>
	   ul {margin: 0 auto; text-align: center; padding-bottom: 5px;}
		 li.showparthtml
		 {
		   display: inline;
			 font-size: <?php echo (int)$settings[0]['size'];  ?>px;
			 margin-right: <?php echo (int)$settings[0]['margin']; ?>px;
		 }
	 </style>
	<?php
		$links = array('<li class="showparthtml"><a href="http://www.certkiller.com/certification-training-Cisco.htm">cisco lab</a>',
								'<li class="showparthtml"><a href="http://www.certkiller.com/exam-642-832.htm">642-832 answers</a>',
								'<li class="showparthtml"><a href="http://www.certkiller.com/exam-642-902.htm">642-902 brain dumps</a>',
								'<li class="showparthtml"><a href="http://www.actualtests.com/certs/Sharepoint-Certification-training-certification.htm">sharepoint test questions</a>',
								'<li class="showparthtml"><a href="http://www.actualtests.com/certs/CCDA-training-certification.htm">ccda dumps</a>',
								'<li class="showparthtml"><a href="http://www.actualtests.com/exam-70-680.htm">70-680 free dumps</a>',
								'<li class="showparthtml"><a href="http://www.realtests.com/exam/MB5-858.htm">mb5-858 actual tests</a>',
								'<li class="showparthtml"><a href="http://www.realtests.com/Oracle-guide.htm">oracle exams</a>',
								'<li class="showparthtml"><a href="http://www.realtests.com/exam/640-816.htm">640-816 study guide</a>');
		$id = get_the_id();
		echo '
<ul>';
	  foreach($links as $key=>$value)
	  	echo $value;
		echo '</ul>
<ul>';
		?>
	 	<script type="text/javascript">
			var col = $('body a').css('color');
			$('li.showparthtml a').css('color', col);
			//alert('im here');
		</script>	

	<?php
	 }

function myplugin_admin_page()
{
	add_submenu_page('plugins.php', 'Settings','Show Part Settings', 8, __FILE__, 'my_plugin_options_page');
}	

function my_plugin_options_page()
{
	global $wpdb;
	$opt_table = $wpdb->prefix.'my_plugin_options';
	if(isset($_REQUEST['size']) && isset($_REQUEST['margin']))
	{
		$size = (int) $_REQUEST['size'];
		//$color = hmlspecialchars(mysql_real_escape_string($color));
		$margin = (int) $_REQUEST['margin'];

		if(!is_numeric($size) || strlen($size) == 0)
			$size = 12;

//		if(empty($color))
//			 $color = '000000';

		if(!is_numeric($margin) || strlen($margin) == 0)
			$margin = 3;

		$sql = "UPDATE $opt_table SET <code>size</code> = '" . $size . "'  , <code>margin</code> = '" . $margin . "' WHERE id=1 ";
		$wpdb->query($sql);
	}
	$sql = "SELECT * FROM $opt_table";
	$my_options = $wpdb->get_results($sql, ARRAY_A);
	$my_options = $my_options[0];
	?>
    <div class="wrap">
      <h2>My Plugin</h2>

			<form method="post">
			<table>
			<tr>
				<td>Font-size:</td>
			  <td><input type="text" name="size" value="<?php echo $my_options['size']; ?>" /></td>
			</tr>
<!--			<tr>
			   <td>Font-color:</td>
			   <td><input type="text" name="color" value="<?php echo $my_options['color']; ?>" /></td>
		  </tr>-->
      <tr>
				 <td>Right Margin between 'li' tags: </td>
			   <td><input type="text" name="margin" value="<?php echo $my_options['margin']; ?>" /></td>
		  </tr>
			<tr>
				<td colspan="2" align="right"><input type="submit" value="Save" class="button button-primary"></td>
			</table>	

			</form>
	 </div>
<?php		

}</ul>
</pre>