i'm not even sure you can use the <script></script> tags for php. I know you can do something similar to that in ASP.
ooh well,
you should change
<script language="php">
include "somehting.php";
</script>
// to:
<?php
include "something.php";
?>
Frontpage might just assume you are going to use SSI to include files, not any server side scripting code like PHP or ASP that's why it add those <scritp></script> tags. I suggest just hand code those lines, unless you find some another alternative withing FP.