Redirect user to index.php

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PHP

i have an site.php page with the following
header (location: "http://www.external site.co.za");
?>

In my index.php page

i have a link Selection

If user click on link he wil be directed to site.php within fancybox and he wont know the exterior url and he wont have to leave my page.

But if user types in http://www.mysitename/site.php it open the external site. I cannot protect the site.php page because you dont have to log in . It is just an information he needs and then back to my side.

Is it possible that if a user does this it must redirect site.php to my index.php

Thank you