Skin PHP

<?php
  header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); #Data Passata
  header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); #Sempre Modificato
  header("Cache-Control: no-store, no-cache, must-revalidate"); #HTTP/1.1
  header("Cache-Control: post-check=0, pre-check=0", false);
  header("Pragma: no-cache"); #HTTP/1.0
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>
  <meta http-equiv="content-type" content="text/html;charset=utf-8">
  <meta name="author" content="Alessandro Marinuzzi [Alecos]">
  <meta name="generator" content="Notepad2">
  <meta name="pragma" content="no-cache">
  <meta name="robots" content="noindex, nofollow">
  <title>CSS Skin</title>
<?php
  if (isset($_POST['change'])) {
    switch ($_POST['skin']) {
      case 'colorato.css':
      setcookie('skin', 'colorato.css', time()+31556926 ,'/');
      $_COOKIE['skin'] = 'colorato.css';
      break;
      case 'riposante.css':
      setcookie('skin', 'riposante.css', time()+31556926 ,'/');
      $_COOKIE['skin'] = 'riposante.css';
      break;
      case 'matrix.css':
      setcookie('skin', 'matrix.css', time()+31556926 ,'/');
      $_COOKIE['skin'] = 'matrix.css';
      break;
      case 'verde.css':
      setcookie('skin', 'verde.css', time()+31556926 ,'/');
      $_COOKIE['skin'] = 'verde.css';
      break;
      default:
      setcookie('skin', 'default.css', time()+31556926 ,'/');
      $_COOKIE['skin'] = 'default.css';
    }
  }
  if (isset($_COOKIE['skin'])) {
    $my_skin = htmlspecialchars($_COOKIE['skin'], ENT_QUOTES, 'ISO-8859-1');
    echo "  <link rel=\"stylesheet\" type=\"text/css\" media=\"screen\" href=\"$my_skin\">\r\n";
  } else {
    echo "  <link rel=\"stylesheet\" type=\"text/css\" media=\"screen\" href=\"dafault.css\">\r\n";
  }
?>
</head>

<body>

<form name="skin" action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<select name="skin" class="skin">
<option class="option_skin" value="colorato.css"<?php if (isset($_COOKIE['skin']) && $_COOKIE['skin'] == 'colorato.css') { echo ' selected'; } ?>>Colorato</option>
<option class="option_skin" value="riposante.css"<?php if (isset($_COOKIE['skin']) && $_COOKIE['skin'] == 'riposante.css') { echo ' selected'; } ?>>Riposante</option>
<option class="option_skin" value="matrix.css"<?php if (isset($_COOKIE['skin']) && $_COOKIE['skin'] == 'matrix.css') { echo ' selected'; } ?>>Matrix</option>
<option class="option_skin" value="verde.css"<?php if (isset($_COOKIE['skin']) && $_COOKIE['skin'] == 'verde.css') { echo ' selected'; } ?>>Verde</option>
</select>
<input class="button" type="submit" name="change" value="Cambia Skin">
</form>

</body>

</html>