Code:
<?php
$mov = $_GET['x'];
$mov = strip_tags($mov);
$url = "http://yoursite.com/header.html";
$html = file_get_contents($url);
echo "$html<br><center><embed src=$mov.mpg></embed>";
?>
heres a better version .. this way you can just add a header to every video , put whatever html you want in the header page and it will be put above the video.. so you can customize the output page a little better