php+sql server 2008 ไม่สามารถแก้ไขข้อมูลได้ครับ ช่วยแก้ทีครับ

<form method="POST" action="user_update.php">
<?
$objConnect = mssql_connect("TOPVIEWPOINT-PC","sa","1234") or die("Error Connect to Database");
$strSQL = "SELECT * FROM member WHERE id = '".$_GET["Mem_1"]."' ";
$objDB = mssql_select_db("callcenter");
$objQuery = mssql_query($strSQL);
$objResult = mssql_fetch_array($objQuery);
if(!$objResult)
{
	echo "Not found id=".$_GET["Mem_1"];
}
else
{
?>
<center><table border="1" bordercolor="blue" cellspacing="0">
<tr><td colspan="2" bgcolor="blue"><center><b>แก้ไขข้อมูลสมาชิก</b></center></td></tr>
<tr>
<td width="150">ชื่อ (ไทย)</td><td><input type="text" name="text_thname" value="<?=$objResult["mem_thname"];?>"></td>
</tr>
<tr>
<td width="150">นามสกุล (ไทย)</td><td><input type="text" name="text_thsurname" value="<?=$objResult["mem_thsurname"];?>"></td>
</tr>
<tr>
<td width="150">ชื่อ (อังกฤษ)</td><td><input type="text" name="text_enname" value="<?=$objResult["mem_enname"];?>"></td>
</tr>
<tr>
<td width="150">นามสกุล (อังกฤษ)</td><td><input type="text" name="text_ensurname" value="<?=$objResult["mem_ensurname"];?>"></td>
</tr>
<tr>
<td width="150">Username</td><td><input type="text" name="text_username" value="<?=$objResult["mem_username"];?>"></td>
</tr>
<tr>
<td width="150">Password</td><td><input type="password" name="text_password" value="<?=$objResult["mem_password"];?>"></td>
</tr>
<tr>
<td width="100">Telephone</td><td><input type="text" name="text_tel" value="<?=$objResult["mem_tel"];?>"></td>
</tr>
<tr>
<td>หน่วยงาน</td>
<td><select name="department">
<option value="โครงการ1799">โครงการ1799</option>
</select></td></tr>
<tr>
<td>สิทธิการใช้งาน</td>
<td><select name="level">
<option value="1">admin</option>
<option value="2">admincontent</option>
<option value="3">content</option>
<option value="4">callcenter</option>
</select></td></tr>
<td>แผนก</td>
<td><select name="emp">
<option value="1799">1799</option>
</select></td></tr>
<tr>
<td colspan="2"><center><input type="submit" name="submit" value="เพิ่มข้อมูล">&nbsp<input type="reset" name="reset" value="ยกเลิก"></td></center>
</tr>
</table></center>
<?
}
mssql_close($objConnect);
?>
</form>

<?
$objConnect = mssql_connect("TOPVIEWPOINT-PC","sa","1234") or die("Error Connect to Database");
$objDB = mssql_select_db("callcenter");
$strSQL = "UPDATE member SET ";
$strSQL .="mem_thname = '".$_POST["text_thname"]."' ";
$strSQL .=",mem_thsurname = '".$_POST["text_thsurname"]."' ";
$strSQL .=",mem_enname = '".$_POST["text_enname"]."' "; 
$strSQL .=",mem_ensurname = '".$_POST["text_ensurname"]."' ";
$strSQL .=",mem_username = '".$_POST["text_username"]."' ";
$strSQL .=",mem_password = '".$_POST["text_password"]."' ";
$strSQL .=",mem_tel = '".$_POST["text_tel"]."' ";
$strSQL .=",depart = '".$_POST["department"]."' ";
$strSQL .=",level_id = '".$_POST["level"]."' ";
$strSQL .=",emp_code = '".$_POST["emp"]."' ";
$strSQL .="WHERE id = '".$_GET["Mem_1"]."' ";
$objQuery = mssql_query($strSQL);
if($objQuery)
{
echo "<script>window.location.href='user.php'</script>";
}
else
{
echo "Error Save [".$strSQL."]";
}
mssql_close($objConnect);
?>