Some piece of script is missing

In head is:

  <title><?php print $head_title ?></title>
  <meta http-equiv="Content-Style-Type" content="text/css" />
  <?php print $head ?>
  <?php print $styles ?>
  <script type="text/javascript"> </script>

and should be

  <title><?php print $head_title; ?></title>
  <?php print $head; ?>
  <?php print $styles; ?>
  <?php print $scripts; ?>