The code of this page :<?
$hr=$_SERVER['HTTP_REFERER'];
echo"
<center><big>\$_SERVER['HTTP_REFERER'];<br>
$hr</center>
<div align=right>
<a href=http:/extra/f_unblocked.htm>/extra/f_unblocked.htm</a> &nbsp;
<a href=$hr>back</a> <!-- back=<?=$hr?> -->
</div>
";
?>