Remember, when testing insertScore.php on its own, it uses sample values. When you come to use the highscores.swf file, you will need to comment out these lines:
// temporary data - comment out when using SWF //
$scoreOutput = 1500;
$playerOutput = "Eric";
...like so...
// temporary data - comment out when using SWF //
// $scoreOutput = 1500;
// $playerOutput = "Eric";