Useronline script, hvilke værdier skal MySQL'en have?

Hej, jeg har fundet et script på nettet, men der står ikke hvilke navne mine kollonder i tabellen skal have..

scriptet:

<?php
/*
####################################
#
#  File name            : useronline.php
#  Version              : 1.0
#  Created By              : TeeJay
#  Created on            : 07 Jan 2003
#  e-mail                : teejay@webdesigning.demon.co.uk
#  Copyright            : 2003 by Webdesigning Templates & Scripts
#  Website                : http://webdesigning.demon.co.uk
#  Description:
#    It stores the user's IP and the page he/she is browsing and counts how
#    many visitors are currently visiting that page, displaying the number...
#
####################################

#  Start of Configuration  #
#################################### */
$sql_host        = "localhost";        //#    The sql server hostname, usualy "localhost"
$sql_username    = "username";            //#    The username to the sql server
$sql_password    = "password";            //#    The password to the sql server
$sql_dbName    = "databse_name";            //# The database in question

// CONNECT TO DATABASE //
    $db_con = mysql_connect($sql_host, $sql_username, $sql_password)   
                OR die("<b><font color=\"red\">Could not connect to MySQL server ($sql_host)...</b>\n<br>" . mysql_error() . "<br>Error @ line: " . __line__ . "</font>");
    $db_select = mysql_select_db($sql_dbName)   
                OR die("<b><font color=\"red\">Could not connect to the DATABASE ($sql_dbName)...</b>\n<br>" . mysql_error() . "<br>Error @ line: " . __line__ . "</font>");
// END OF DATABASE CONNECTION //
//===============================================//

$timeoutseconds    = 300;            //# Timeout value in seconds

//#  End of Configuration  #
//####################################

$timestamp = time();
$timeout = ($timestamp-$timeoutseconds);
    mysql_query("INSERT INTO useronline VALUES('$timestamp', '".$_SERVER['REMOTE_ADDR']."', '".$_SERVER['PHP_SELF']."')") or die("Useronline Database INSERT Error");   
    mysql_query("DELETE FROM useronline WHERE timestamp<$timeout") or die("Useronline Database DELETE Error");
    $result = mysql_query("SELECT DISTINCT ip FROM useronline WHERE file='$_SERVER[PHP_SELF]'") or die("Useronline Database SELECT Error");
    $user = mysql_num_rows($result);
mysql_close();
if ($user==1) {
    echo "$user User online";
}else {
    echo "$user Users online";
}
?>