<?PHP

if ($_SERVER['HTTP_REFERER'] == "www.aaaa.com")
{

header ("Location: http://www.bbb.com");

}

else if ($_SERVER['HTTP_REFERER'] == "www.bbb.com")

{

header ("Location: http://www.aaa.com");

}

else

{

header("Location: http://www.deneme.com");

}

?>