ปัญหาการอัพเดทค่ะ...ปัญหาคือว่า หน้า editQuestion สามารถ query ข้อมูลของคำถามขึ้นมาได้ถูกต้องทุกอย่าง

<?php
//////////////////////////////////////////////////////////editQuestion.php/////////////////////////////////////////////////////////////

ob_start();
include "connect.php";
?>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css">
<!--
.style1 {
	font: Tahoma;
	color: #FFFFFF;
	font-weight: bold;
	font-size:18px;
}
-->
</style>

<?
$ex_id = $_GET['ex_id'];
$ques_id = $_GET['ques_id'];

$sql = "select * from question where ex_id = '$ex_id' and ques_id = '$ques_id'";
$db_query = mysql_query($sql) or die ("Select error");
$result = mysql_fetch_array($db_query);

$ques = $result[question];
$c1 = $result[choice1];
$c2 = $result[choice2];
$c3 = $result[choice3];
$c4 = $result[choice4];
$ans = $result[answer];
$sc = $result[score];
?>

<form id="form1" name="form1" method="post" action="editQuestionSave.php">
  <table width="580" border="0" align="center">
    <tr>
      <td colspan="2" bgcolor="#000099"><div align="center" class="style1">แก้ไขคำถาม</div></td>
    </tr>
    <tr>
      <td width="30%" bgcolor='#AEFFFF'>คำถาม</td>
      <td width="70%"><textarea name="ques" cols="50" rows="5" id="ques"> <? echo $ques;?></textarea></td>
    </tr>
    <tr>
      <td width="30%" bgcolor='#AEFFFF'>ตัวเลือกที่ 1</td>
      <td width="70%"><input name="ch1" type="text" id="ch1" size="30" value="<? echo $c1;?>"/>      </td>
    </tr>
    <tr>
      <td width="30%" bgcolor='#AEFFFF'>ตัวเลือกที่ 2</td>
      <td width="70%"><input name="ch2" type="text" id="ch2" size="30" value="<? echo $c2;?>"/>      </td>
    </tr>
    <tr>
      <td width="30%" bgcolor='#AEFFFF'>ตัวเลือกที่ 3</td>
      <td width="70%"><input name="ch3" type="text" id="ch3" size="30" value="<? echo $c3;?>"/></td>
    </tr>
    <tr>
      <td width="30%" bgcolor='#AEFFFF'>ตัวเลือกที่ 4</td>
      <td width="70%"><input name="ch4" type="text" id="ch4" size="30" value="<? echo $c4;?>"/></td>
    </tr>
    <tr>
      <td width="30%" bgcolor='#AEFFFF'>คำตอบ</td>
      <td width="70%"><input name="ans" type="text" id="ans" size="2" maxlength="1" value="<? echo $ans;?>"/></td>
    </tr>
    <tr>
      <td width="30%" bgcolor='#AEFFFF'>คะแนน</td>
      <td><input name="score" type="text" id="score" size="2" maxlength="2" value="<? echo $sc;?>"/></td>
    </tr>
    <tr>
      <td width="30%">&nbsp;</td>
      <td width="70%">&nbsp;</td>
    </tr>
    <tr>
      <td colspan="2"><div align="center">
          <input name="Submit" type="submit" value="แก้ไข" />
        &nbsp;&nbsp;&nbsp;
        <input type="reset" name="Submit2" value="ยกเลิก" onClick="history.back();" />
      </div></td>
    </tr>
  </table>
  	<INPUT type="hidden" VALUE="<?=$ex_id;?>" name="ex_id">
	<INPUT type="hidden" VALUE="<?=$ques_id;?>" name="ques_id">
</form>
<?
ob_end_flush();
mysql_close();
?>

<?php
///////////////////////////////////////////////////////editQuestionSave.php//////////////////////////////////////////////////////
ob_start();
include ("connect.php");
?>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<?
//$qid = $_POST["quesID"];
$ex_id = $_POST["ex_id"];
$ques_id = $_POST["ques_id"];
$ques = $_POST["ques"];
$ch1 = $_POST["ch1"];
$ch2 = $_POST["ch2"];
$ch3 = $_POST["ch3"];
$ch4 = $_POST["ch4"];
$ans = $_POST["ans"];
$scr = $_POST["score"];

if(($ques=="")||($ch1=="")||($ch2=="")||($ch3=="")||($ch4=="")||($ans=="")||($scr==""))
{
	echo "<script>alert('กรอกข้อมูลไม่ครบ');history.back();</script>";
}
else if(!is_numeric($ans))
{
	echo "<script>alert('คำตอบต้องเป็นตัวเลขเท่านั้น');history.back();</script>";
}
else if(($ans=="0")||($ans=="5")||($ans=="6")||($ans=="7")||($ans=="8")||($ans=="9"))
{
	echo "<script>alert('คำตอบต้องเป็นตัวเลข 1-4 เท่านั้น');history.back();</script>";
}
else if(!is_numeric($scr))
{
	echo "<script>alert('คะแนนต้องเป็นตัวเลขเท่านั้น');history.back();</script>";
}
$sql = "select * from question where ex_id='$ex_id' and ques_id='$ques_id'";
$db_query = mysql_query($sql) or die ("Select error");
$count = mysql_num_rows($db_query);
if($count==0)
{
	echo "<script>alert('ไม่มีข้อมูลนี้');history.back();</script>";
}
else
{
	$sql = "update question set question='$ques',choice1='$ch1',choice2='$ch2',choice3='$ch3',choice4='$ch4',answer='$ans',score='$scr'";
	$result = mysql_query($sql) or die("Update error");
	echo "<script>alert('แก้ไขแบบทดสอบเรียบร้อยแล้ว');history.back();</script>";		
}

ob_end_flush();
mysql_close();
?>