Ошибка Notice: Undefined index: Itemid in - Joomla 1.0: Общие вопросы

Notice: Undefined index: Itemid in \templates\123\menu.php on line 8

<div id="menucenter">
      <table cellpadding="0" cellspacing="0" style="margin:0 auto;">
         <tr>
               <td class="menu_m">
                  <div id="topnavi">
                     <ul>
                     <?php
                        $item_id = mysql_escape_string( $_GET['Itemid'] );
                        $qry = "SELECT id, name, link FROM #__menu WHERE menutype='mainmenu' and parent='0' AND access<='$gid' AND sublevel='0' AND published='1' ORDER BY ordering LIMIT 5";
                        $database->setQuery($qry);
                        $rows = $database->loadObjectList();
                        foreach($rows as $row) {
                           echo "<li><a href='$row->link&Itemid=$row->id' ".( $row->id == $item_id ? "class='current'" : "" )." ><span>$row->name</span></a></li>";
                        }
                     ?>         
                     </ul>
                  </div>               
               </td>         
         </tr>
      </table>   
</div>

$item_id = mysql_escape_string( $_GET['Itemid'] );

$item_id = $GLOBALS['Itemid'];