ขอถามอะไรหน่อยน่ะครับเกี่ยว กับ การใช่ if else เพื่อ ให้เกิด กรอปที่ ดต้ ตอบคำถามอ่ะครับ

<?
session_start();
include "./include/connect1.php";
session_register("sess_id");

 
?>


<style type="text/css">
<!--
a:link {
	color: #FFFFFF;
	text-decoration: none;
}
a:visited {
	text-decoration: none;
}
a:hover {
	text-decoration: none;
}
a:active {
	text-decoration: none;
}
.style1{
font-size:15px;
font-weight:bold;
}
.style2 {
	font-size: 16px;
	font-weight:bold;
	color: #4A2616;
}
.style26 {font-family: "Angsana New", Batang, "Bodoni MT", Calibri; font-size: 20px; font-weight: bold; }
.style28 {font-family: "Angsana New", Batang, "Bodoni MT", Calibri; font-size: 20px; }
-->
</style>
  <table align="right" width="80%" border="0" cellpadding="4" cellspacing="0">
  <tr>
   
    <td align="center"><form  action="" method="post"><table width="100%" border="0" cellspacing="0">
      <tr>
        <td background="image/bgu.jpg" height="100">&nbsp;</td>
      </tr>
      <tr>
        <td background="image/bgm.jpg" align="center"><table width="80%" border="0" align="center">
          
          <tr>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
          </tr>
          	<?
$id=$_GET['id'];
$sql="select *,
					DATE_FORMAT(n_timein,'%H:%i') as ntimein,
					DATE_FORMAT(n_timeout,'%H:%i')as ntimeout,
					DATE_FORMAT(n_timein,'%Y-%m-%d') As n_date,
					DATE_FORMAT(s_timein,'%Y-%m-%d') As s_date_timein,
					DATE_FORMAT(s_timeout,'%Y-%m-%d') As s_date_out,
					DATE_FORMAT(s_timein,'%H:%i') as stimein,
					DATE_FORMAT(s_timeout,'%H:%i') as stimeout
					from time_sheet_table
					 where id = '$id' ";
$a=mysql_query($sql);
$read=mysql_fetch_array($a);
?>
          <tr>
            <td>&nbsp;</td>
            <td>รหัส :</td>
            <td><span class="style26"><? echo $read['id']; ?>
                <input type="hidden" name="P_id"  value="<?=$read['id'] ?>"/>
            </span></td>
            <td>&nbsp;</td>
          </tr>
          
          <tr>
            <td width="20%">&nbsp;</td>
            <td width="20%" class="style2">Day : </td>
            <td width="40%"><input type="text" name="day"  value="<?=$read['day']?>"/></td>
            <td width="20%">&nbsp;</td>
          </tr>
          <tr>
            <td>&nbsp;</td>
            <td class="style2">Nomal date : </td>
            <td><input type="text" name="n_date"  value="<?=$read['n_date']?>"/></td>
            <td>&nbsp;</td>
          </tr>
          <tr>
            <td>&nbsp;</td>
            <td class="style2">Nomal Time in :</td>
            <td><input type="text" name="ntimein"  value="<?=$read['ntimein']?>"/></td>
            <td>&nbsp;</td>
          </tr>
          <tr>
            <td>&nbsp;</td>
            <td class="style2"><p>Nomal Time out :</p></td>
            <td><input type="text" name="ntimeout"  value="<?=$read['ntimeout']?>"/></td>
            <td>&nbsp;</td>
          </tr>
          <tr>
            <td>&nbsp;</td>
            <td class="style2">Shift date in :</td>
            <td><input type="text" name="s_date_timein"  value="<?=$read['s_date_timein']?>"/></td>
            <td>&nbsp;</td>
          </tr>
          <tr>
            <td>&nbsp;</td>
            <td valign="top" class="style2"> Shift timein :</td>
            <td><input type="text" name="stimein"  value="<?=$read['stimein']?>"/></td>
            <td>&nbsp;</td>
          </tr>
          <tr>
            <td>&nbsp;</td>
            <td class="style2">Shift date out :</td>
            <td><input type="text" name="s_date_out"  value="<?=$read['s_date_out']?>"/></td>
            <td>&nbsp;</td>
          </tr>
          <tr>
            <td>&nbsp;</td>
            <td>Shift Time out :</td>
            <td><input type="text" name="stimeout"  value="<?=$read['stimeout']?>"/></td>
            <td>&nbsp;</td>
          </tr>
          
          <tr>
            <td>&nbsp;</td>
            <td class="style2">Detail :</td>
            <td><textarea name="detail" cols="45" id="detail"><?=$read['detail']?>
            </textarea></td>
            <td>&nbsp;</td>
          </tr>
          <tr>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td><input type="submit" name="ok" value="แก้ไข"  style="background-color:#7B533A; color:#FFFFFF"/>              &nbsp;&nbsp;&nbsp;<span class="style28">
              <? 
			  $id =$read['id'];
	  $day=$_REQUEST['day'];
	  $n_date=$_REQUEST['n_date'];
	  $ntimein=$_REQUEST['ntimein'];
	  $ntimeout=$_REQUEST['ntimeout'];
	  $s_date_timein=$_REQUEST['s_date_timein'];
	  $stimein=$_REQUEST['stimein'];
	   $s_date_out=$_REQUEST['s_date_out'];
	  $stimeout=$_REQUEST['stimeout'];
	  $detail=$_REQUEST['detail'];
	    ?>
            </span></td>
            <td><h><?= $test['id'] ?></h></td>           
          </tr>
        </table>
          <p>
		<?
		echo $id ;
		echo $day . "\n";
		echo $n_date; 
		echo "\n";
		$sql = "UPDATE time_sheet_table SET detail = '$detail'
						where id = '$id' ";
		mysql_query($sql) ; 
//ตรงนี้อ่ะครับ ผมควรจะเขียน if else ยังไงดีครับให้มันบอกว่าถ้าเสร็จ แล้วให้ ขึ้นว่าเสร็จถ้ายังให้ขึ้นว่าไม่เสร็จอ่ะครับ
		
	echo "<script>alert('com....');window.location='edit.php'</script>";
	
		?>          
          </p></td>
      </tr>
      <tr>
        
      </tr>
    </table></form></td></tr>
    
</table>