ช่วยหน่อยครับ session มันไม่บันทึกค่าขอผู้มีประสบการณ์ ช่วยหน่อยนะคับ

<?
session_start();
include('connect.php');
		
		$username=$_POST['username'];
		$password=$_POST['password'];
		
		if($username=="" or $password==""){
			alert("กรุณากรอกข้อมูลก่อนเข้าสู่ระบบ");
		}
		
		$SQL= "select  * from Member where M_user='$username'";
		$result= mysql_query($SQL)or die (error_msg(mysql_error(), $SQL));
		$number= mysql_num_rows($result);
		$arr= mysql_fetch_array($result);
		
		if($username==$arr['M_user'] and $password==$arr['M_pass']){
			
		//$SQLud="UPDATE `Member` SET `M_active` = '1' WHERE `M_user`='$username'";
		//$resultud = mysql_query($SQLud)or die(error_msg(mysql_error(),$SQLud));
		  session_regenerate_id(); 
	    $_SESSION['USERID'] = $username; 
    	$_SESSION['LOGGEDIN'] = true; 
		
			alert("การเข้าระบบถูกต้อง","index.php");
		}else{
			alert("ข้อมูลไม่ถูกต้อง");
		}
?>

<? 
include("connect.php");


 
if($_SESSION["LOGGEDIN"]==true){
?>
<table width="918" border="0" cellspacing="0" cellpadding="0" bordercolor="#131110">
    <tr>
      <td width="250"bgcolor="#131110"><img src="images/t_1.jpg" width="250" height="50" /></td>
      <td width="448" bgcolor="#131110">ยินดีต้อนรับ <font color="#FF3300"><b><?=$_SESSION['USERID'];?></b>| <a href="logout.php">LOGOUT</a></font></td>
      <td width="200"bgcolor="#131110"><a href="register.php"><img src="images/t_2.jpg" width="113" height="50" /></a></td>
    </tr>
  </table>

<? }else{
	 ?>
       <table width="918" border="0" cellspacing="0" cellpadding="0" bordercolor="#131110">
    <tr>
      <td width="250"bgcolor="#131110"><img src="images/t_1.jpg" width="250" height="50" /></td>
      <td width="448" bgcolor="#131110">
  <form name="form1" method="post" action="takelogin.php">
    <table width="448" border="0" cellspacing="0" cellpadding="0">
        <tr>
          <td><b>USERNAME</b></td>
          <td><label for="username"></label>
            <input name="username" type="text" id="username" size="15" /></td>
          <td><b>PASSWORD</b></td>
          <td><label for="password"></label>
            <input name="password" type="password" id="password" size="15" /></td>
          <td><input type="image" name="submit" value="send" src="images/bt_login.jpg" /></td>
        </tr>
      </table>
      </form>
      </td>
      <td width="200"bgcolor="#131110"><a href="register.php"><img src="images/t_2.jpg" width="113" height="50" /></a></td>
    </tr>
  </table>

  <? } ?>