อยากสอบถามเรื่องการจะแยกสมาชิก กับ บุคคลทั่วไป ที่กำลังออนไลน์อะครับ

<?php
$Session_name = "default";
$host = "localhost"; // Server
$username = ""; // User Mysql
$password = ""; // Password Mysql
$database = ""; // ชื่อฐานข้อมูล
$table = "useronline"; // ชื่อ Table



if ($Session_name == "default") {
session_start();
}
else {
session_name("$Session_name");
session_start("$Session_name");
}
$mem_status=$_SESSION[mem_status];
$UID=$_SESSION[mem_id];
$SID = session_id();
$time = time();
$dag = date("z");
$nu = time()-600; // Keep for 15 mins


mysql_connect ($host, $username, $password) OR DIE ("Could not connect to MySQL");
mysql_select_db($database) OR DIE ("Can't select database.");

$sidcheck = mysql_query("SELECT count(*) FROM $table WHERE SID='$SID'");
$sid_check = mysql_result($sidcheck,0);
if ($sid_check == "0"){

mysql_query("INSERT INTO $table (SID,time,day,UID,status) VALUES ('$SID','$time','$dag','$UID','$mem_status')");
} else {

mysql_query("UPDATE $table SET time='$time',UID='$UID',status='$mem_status' WHERE SID='$SID'");
}




$count_users = mysql_query("SELECT count(*) FROM $table WHERE time>$nu AND day=$dag");
$users_online = mysql_result($count_users,0);
echo "<div align='center'><img src='icon/user_online.gif' width='20' height='20'/>&nbspจำนวนผู้ออนไลน์ $users_online คน<br><br></div>"; // echo จำนวนผู้ online ออกมาก

mysql_query("DELETE FROM $table WHERE time<$nu");
mysql_query("DELETE FROM $table WHERE day != $dag");

mysql_close();
?>
<table width="100%" border="0">
<?php
include('config.inc.php');
$sql = "SELECT * FROM useronline,member WHERE mem_id=UID and mem_status=status";
$result = mysql_query($sql);
while($data = mysql_fetch_array($result)){
?>
<tr><td>
<?php
if($data[status]=="member"){
echo "<font size=1px><img src='icon/check-user-icon.jpeg' width='20' height='20'/>&nbsp&nbsp;<font color='#000000'>$data[mem_fullname] ('สมาชิกทั่วไป')</font></font>";
}else if($data[status]=="bit51"){
echo "<font size=1px><img src='icon/check-user-icon.jpeg' width='20' height='20'/>&nbsp&nbsp;<font color='#0000FF'>$data[mem_fullname] (สมาชิก 'BIT51')</font></font>";
}else if($data[status]=="admin"){
echo "<font size=1px><img src='icon/check-user-icon.jpeg' width='20' height='20'/>&nbsp&nbsp;<font color='#FF0000'>$data[mem_fullname] ('ผู้ดูแลระบบ')</font></font>";
}
?>
</td></tr>
<? } ?>
</table>