Using PHP to retrieve and display file from MySQL database

I am trying to download a file from MySQL and display it using the
following PHP script,
but it isn't displaying the file just a list of files in the database.
Please help.

---- Code Begin ----
<?
if(isset($_GET['id']))
{
include 'library/config.php';
include 'library/opendb.php';

$id = $_GET['id'];
$query = "SELECT name, type, size, content FROM upload WHERE id = '$id'";
$result = mysql_query($query) or die('Error, query failed');
list($name, $type, $size, $content) = mysql_fetch_array($result);

header("Content-Disposition: attachment; filename=$name");
header("Content-length: $size");
header("Content-type: $type");
echo $content;

include 'library/closedb.php';
exit;
}

?>
<html>
<head>
<title>Download File From MySQL</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>

<body>
<?
include 'library/config.php';
include 'library/opendb.php';

$query = "SELECT id, name FROM upload";
$result = mysql_query($query) or die('Error, query failed');
if(mysql_num_rows($result) == 0)
{
echo "Database is empty <br>";
}
else
{
while(list($id, $name) = mysql_fetch_array($result))
{
?>
<a href="download.php?id=<?=$id;?>"><?=$name;?></a> <br>
<?
}
}
include 'library/closedb.php';
?>
</body>
</html>

---- Code End ----