ช่วยด้วย!! Session php ไม่เก็บค่า หาทางแก้ไม่ได้ [มือใหม่]

<form action="login2.php" method="post" enctype="multipart/form-data" name="form1" id="form1"><table width="437" border="0" align="center" cellpadding="5" cellspacing="0">
        <tr>
          <td width="427" colspan="2" bgcolor="#FFFFFF"><div align="center">
            <table width="548" border="1" align="center" cellpadding="5" cellspacing="0">
              <tr>
                <td colspan="2" bgcolor="#88DDBB"><div align="center" class="green">
                  <div align="center" class="Btext">เข้าสู่ระบบ</div>
                  </div></td>
              </tr>
              <tr>
                <td width="235" bgcolor="#FFFFCC"><div align="center">E-mail</div></td>
                <td width="287" bgcolor="#FFFFFF"><p>
                  <label for="txtUsername"></label>
                  <input type="text" name="txtUsername" id="txtUsername" />
                  </p></td>
              </tr>
              <tr>
                <td bgcolor="#FFFFCC"><div align="center">Password</div></td>
                <td bgcolor="#FFFFFF"><input type="text" name="txtPassword" id="txtPassword" /></td>
              </tr>
              <tr>
                <td colspan="2"><div align="center">
                  <p>&nbsp;                    </p>
                  <p>
                    <input class="button_example" type="submit" name="button" id="button" value="เข้าสู่ระบบ" />
                    <input class="button_red" type="button" onclick="window.history.back()" name="button2" id="button2" value="ยกเลิก" />
                    </p>
                  </div></td>
              </tr>
            </table>
          </div></td>
        </tr>
      </table>
      </form>

<?php session_start();
	include "connect.php";
	$strSQL = "SELECT * FROM member WHERE m_email = '".mysql_real_escape_string($_POST['txtUsername'])."' 
	and m_password = '".mysql_real_escape_string($_POST['txtPassword'])."'";
	$objQuery = mysql_query($strSQL);
	$objResult = mysql_fetch_array($objQuery);
	if(!$objResult)
	{
			?>
            
			<script language="javascript">
		alert("E-mail หรือ Password ผิด กรุณาลองอีกครั้ง");
		 window.history.go(-1);
			</script>
            <?
	}
	else
	{
			$_SESSION["m_email"] = $objResult["m_email"];
			session_write_close();
			?>
            
			<script language="javascript">
		alert("ยินดีต้อนรับ");
		window.location = 'index.php';
			</script>
            <?
			
				
	}
	mysql_close();
?>

<?php session_start();
if($_SESSION['m_email'] =="")
{
	header("location:frm_login.php");
	exit();
}

   include "connect.php";
		 ?>

<?