It's not hard to hack a score post to PHP. If you're posting the data, player = "Mark" and score = "50" so you can show the top 10 scores on your site, who's to stop someone from changing the posting data from 50 to 10000000000000? One system that I'd recomend as a quick fix is a secret password encrypted with your post. Then, when they check what data is posted they will see a bunch of numbers, that they can't change without your password. By Iconoclast
This tutorial will gide you, to make two Flash movies that are running (One proyector & one in the player, or player/browser, or browser/browser, etc..) To comunicate with each other. By Dragnovich