ทำยังไงให้หน้า main ของสมาชิก แสดงชื่อว่า สมาชิกล็อคอินเข้ามาแล้วและอยู่ในระบบคะ

<div id="Layer8">
  <form id="form1" name="form1" method="post" action="logincheck.php">
    <table width="366" height="144" border="0">
      <tr>
        <td width="98" height="48"> <span class="style39">username</span><span class="style31">&nbsp;&nbsp;</span></td>
        <td width="46"><span class="style40">:</span></td>
        <td width="208"><span class="style31">
          <input name="username" type="text" id="username" />
        </span></td>
      </tr>
      <tr>
        <td height="44"><span class="style39">password&nbsp;</span></td>
        <td><span class="style40">:&nbsp;</span></td>
        <td><span class="style31">
          <input name="password" type="password" id="password" />
        </span></td>
      </tr>
      <tr>
        <td>&nbsp;</td>
        <td><p class="style31">&nbsp;</p>        </td>
        <td><p class="style31"> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
            <input name="login" type="submit" id="login" value="login" />
          </p>          </td>
      </tr>
    </table>
  </form>
</div>

<meta http-equiv= "content-Type" content="Text/html; charset=utf-8" />
<?

	$_SESSION["user_id"]= $user_id;
$_SESSION["username"]= $username;

include("connect.php");
$username	= $_POST['username'];
$password	= $_POST['password'];
$sql	 = "select * from member where username='$username' and password='$password'";
$query	 = mysql_db_query($db,$sql);
$num	 = mysql_num_rows($query);

if ($num == 0)
{
echo "<script> alert (' กรุณาตรวจสอบ username หรือ password ') ; history.back();</script>";
exit();
}

else
{
$r = mysql_fetch_array($query);
$_SESSION["user_id"]= $r["user_id"];
$_SESSION["status"]= $r["status"];


 if ($_SESSION["status"]== 0)
{
echo "<script> alert ('ยินดีต้อนรับ ADMIN เข้าสู่ระบบ') ; window.location='homeadmin.php';</script>";

}

else
{
echo "<script> alert ('ยินดีต้อนรับสมาชิกเข้าสู่ระบบ') ; window.location='home.php';</script>";

}
}
?>