Session management and include files

[jeff_borden]

Can I manage my sessions through an include file? Example, can I put the following code into an include file:

session_start();
$time = $SESSION['Time'];
$user = $SESSION['User'];
$now = time();
echo $now;
echo "<BR>$time";
if($now > ($time + 1200))
{
$query2 = "UPDATE users SET online = 'n' WHERE username = '$user'";
$result2 = mysql_query($query2);
session_destroy();
?>
<script language=javascript>
window.parent.location.href = "index.php";
</script>
<?
}

Then call it from a normal file like so:

include "./sess_mgmt.inc";

Also, can I have an include file inside an include file?

Thanks in advance for any help offered.......