Submtting Score

I have forumhome page defined as forum.php and i have index.php as portal page. I was editing index.php and adding some code to the start of the page but unfortunately my new server doesn't like this at all. Is there any way to handle this via a plugin ? The code i was adding to index.php was

// ibProArcade
if($_POST['module'] == "pnFlashGames")
{
        require_once('./global.php');

        switch($_POST['func'])
        {
                case "storeScore":
                $_GET['act'] = "Arcade";
                $_GET['module'] = "arcade";


                $_GET['do'] = "pnFStoreScore";
                break;

                case "saveGame":
                $_GET['do'] = "pnFSaveGame";
                break;

                case "loadGame":
                $_GET['do'] = "pnFLoadGame";
                break;

                case "loadGameScores":
                $gid = $vbulletin->input->clean_gpc('p', 'gid', TYPE_NOHTML);
                $uid= $vbulletin->userinfo['userid'];
                $game = $db->query_first("SELECT * FROM " . TABLE_PREFIX . "games_scores WHERE mid=$uid AND gid = $gid ORDER BY score DESC LIMIT 0,1");
                $scores = $game[score];

                if($scores != false)
                {
                        //Return true
                        print "&opSuccess=true&gameScores=$scores&endvar=1"; //send endvar to keep opSuccess separate from all other output from PostNuke
                }
                else
                {
                        print "&opSuccess=false&error=Error&endvar=1";
                }
                break;
        }
}

$act = $_GET[act];
$autocom = $_GET[autocom];
$showuser= $_GET[showuser];
if($act == "Arcade" || $autocom=="arcade") {
include "arcade.php";
exit();
}
if(!empty($showuser) && $showuser >= 1) {
$u = $showuser;
$_GET[u] = $showuser;
include "member.php";
exit();
}

// end of ibProArcade