decript injected script

[saltedm8]

hi, someone has injected some code into a friends site, and I was wondering if anyone would know how to decript this

 

<?php ob_start() ?>
<?php
if ($_GET['randomId'] != "X0aqNsHDBAkLs4111Ran0TNFVTBk9TxSEtG8BRkxDkrp4_CVz4nbugcM85ZGhicl_dgtDBMUdpIq5D7uINd1y3CLMgyVkn0BSHsDeoYDqkzXrHh2nrN6AdnolNlXkaJjuRLSURWj6ld7GgWFl0dL629rMdIkSKzc7IusXNZ6mDHpUmMnTl9MvTZ51wzms3cjopN2eiGfOVxKoxX_oTQXjKM3cUarcYlK7Ym0qvUnYVUv_4qNq_prgVg6LfNoGVpv") {
    echo "Access Denied";
    exit();
}
?>

 

it probably resolves to javascript as that is the output, but since its within the php I was not sure where to put it.. if I have put it in the wrong place, please be my guest and move it

 

thanks