It's easy. When you send the call to the page just do this:
"jax.php?level=" & level & "&score=" & score
On your php page just call them like:
<?php
$level = $_GET['level'].
$score = $_GET['score'].
?>
I replaced the semicolons with periods because they won't show when I post this. And make sure there is a semicolon at the end of line 2 and 3. Then from there you can save to your database and call it back say when a user is logged in or something. If you can't figure it out I will repost a working demo when I get off work.