Php časovač

<?php
header("Content-Type: text/css");
$browser = $_SERVER['HTTP_USER_AGENT'];
if (stristr($browser, "MSIE") || stristr($browser, "Internet Explorer")) {
  /* browser is Internet Explorer */
?&gt;

body {background-color: white; }
p {font-family: arial, sans, sans-serif;
   font-size: 10pt; 
   font-color: blue; }

&lt;?php
  } else
  if (stristr($browser, "Opera")) {

    /* browser is Opera */
?&gt;

body {background-color: lightyellow; }
p {font-family: courier, monospaced;
   font-size: 10pt;
   font-color: darkgreen; }

&lt;?php
  } else
  if (stristr($browser, "Mozilla")) {
    /* Mozilla browser not specified above so default to NN or Mozilla */
?&gt;

body {background-color: aliceblue; }
p {font-family: arial, sans, sans-serif;
   font-size: 12pt;
   font-color: darkblue; }

&lt;?php
  } else {
    /* default catch-all */
?&gt;

body {background-color: white; }
p {font-family: arial, sans, sans-serif;
   font-size: 10pt;
   font-color: black; }

&lt;?php
}
?>

link rel="stylesheet" href="styles-css.php"  type="text/css" 

<?php 
if (date('d.m') > '29.11' && date('d.m')  < '29.2') { 
$cssFile = '1'; 
} else {
$cssFile = '2'; 
} 
?>

<link rel="stylesheet" type="text/css" href="css.php?type=<?php echo $css_file; ?>">

<?php
header('Content-type: text/css');
?>
body {
background-image: url('<?php $_GET['type'] === '1' ? 'obrazek1.jpg' : 'obrazek2.jpg'; ?>');
}

$od = mktime(0, 0, 0, 11, 29, (int) date('Y)); 
$do = mktime(0, 0, 0, 2, 29, (int) date('Y')+1);

if ($od >= time() && $do <= time())
{
  $css_file = 1;
}
else
{
  $css_file = 2;
}