Php code in the html

In the file page.tpl.php, line 22, 37, 41 and 44 some php line are wrongly commented, so the site don't pass the w3c validation.

<?//php if ($main_menu): ?>
      <div id="navigation">
              </div>
<?//php endif; ?>
      
      
                      
   <?//php if ($header || $search_box): ?>