Probleme avec mon script php

<?php

if (!isset($act)){

$act="1";

}

 
if ($act == "2"){

include('sql_setup.php');

$db = mysql_connect($sql_host,$sql_user,$sql_pass);

mysql_select_db('highscore',$db);

$sql = "INSERT INTO scores (name, score) VALUES ('$name', '$score')";

mysql_query($sql, $db);

mysql_close($db);

header("Location:view_highscore.php");

}else{

echo 'Add Score<br><form action="highscore.php" method="POST"><input type=hidden name="act" value="2">Name: <input type=text name="name"><br>Score: <input type=text name="score"><br><input type=submit value="add"></form>';

}

?>

<?php

$sql_host = 'localhost';

$sql_user = 'Mon pseudo';

$sql_pass = 'Mon mot de passe';

?>

<?php

include('sql_setup.php');

$db = mysql_connect($sql_host,$sql_user,$sql_pass);

mysql_select_db('highscore',$db);

$sql = 'SELECT * FROM `scores` ORDER BY `score` ASC LIMIT 0, 30';

$result = mysql_query($sql, $db);

echo 'High-Score List:<br>';

while ($row = mysql_fetch_row($result)){

echo $row[0].': '.$row[1].'<br>';

}

mysql_close($db);

?>