การ Select Data แล้วข้อมูลไม่ขึ้น ไม่รู้ว่าเกิดจากอะไร รบกวนช่วยดูโค้ดหน่อยครับ

<?
header( "Expires: Sat, 1 Jan 2005 00:00:00 GMT" );
header( "Last-Modified: ".gmdate( "D, d M Y H:i:s" )."GMT" );
header( "Cache-Control: no-cache, must-revalidate" );
header( "Pragma: no-cache" );
header( "content-type: application/x-javascript; charset=UTF-8" );

$province = $_POST[province];
$amphur = $_POST[amphur];
$tumbon = $_POST[tumbon];
$postcode = $_POST[postcode];

$hostname_conn = "localhost";
$username_conn = "root";
$password_conn = "431320436";//
$database_conn = "judgement";
mysql_connect( $hostname_conn , $username_conn , $password_conn ) or die( "เชื่อมต่อฐานข้อมูลไม่ได้" );
mysql_select_db( $database_conn ) or die( "เลือกฐานข้อมูลไม่ได้" ); // เลือกฐานข้อมูล
mysql_query("SET character_set_results=utf8");
mysql_query("SET character_set_client='utf8'");
mysql_query("SET character_set_connection='utf8'");
mysql_query("collation_connection = utf8_unicode_ci");
mysql_query("collation_database = utf8_unicode_ci");
mysql_query("collation_server = utf8_unicode_ci");

//ให้คืนค่าจังหวัดไว้เป็นอันดับแรก
$sql = "SELECT Province_Id,Province_Name FROM province";
$result = mysql_query( $sql );
echo "[{\"province\":\"";
echo "<label for='province'>".iconv("tis-620", "UTF-8", "จังหวัด") ." :</label>";
echo "<select name='province' id='province' onchange='dochange(this)'>";
echo "<option value=''>--".iconv("tis-620", "UTF-8", "กรุณาเลือกจังหวัด") ."--</option>";
while( $fetcharr = mysql_fetch_array( $result ) )
{
$id = $fetcharr[Province_Id];
$name = $fetcharr[Province_Name];
echo "<option value='$id'";
if ( $province == $id ) //เลือกจังหวัดที่เลือกไว้
{
echo " selected='selected'";
};
echo ">$name</option>";
};
echo "</select>\",\"amphur\":\"";
$_SESSION['amphur'] =$_GET["amphur"];

echo "<label for='amphur'>".iconv("tis-620", "UTF-8", "อำเภอ/เขต") ." :</label>";
echo "<select name='amphur' id='amphur' onchange='dochange(this)'>";

//ถ้ามีการเลือกจังหวัดมาแล้วให้แสดงอำเภอต่อ
if ( $province != "0" && $province != "" )
{
echo "<option value=''>--".iconv("tis-620", "UTF-8", "กรุณาเลือกอำเภอ") ." --</option>";
$sql = "SELECT amphur_id, amphur_name FROM amphur WHERE provinceID='$province'";
$result = mysql_query( $sql );
while( $fetcharr = mysql_fetch_array( $result ) )
{
$id = $fetcharr[amphur_id];
$name = $fetcharr[amphur_name];
echo "<option value='$id'";
if ( $amphur == $id ) //เลือกอำเภอที่เลือกไว้
{
echo " selected='selected'";
};
echo ">$name</option>";
};
}
else
{
echo "<option value=''>--------------</option>";
};

echo "</select>\",\"tumbon\":\"";

echo "<label for='tumbon'>".iconv("tis-620", "UTF-8", "ตำบล/แขวง") ." :</label>";
echo "<select name='tumbon' id='tumbon'>";

//ถ้ามีการเลือกอำเภอมาแล้วให้แสดงตำบลต่อ
if ( $amphur != "0" && $amphur != "" )
{
echo "<option value=''>--".iconv("tis-620", "UTF-8", "กรุณาเลือกตำบล") ."--</option>";
$sql = "SELECT tumbon_id, tumbon_name FROM tumbon WHERE amphurID=$amphur";
$result = mysql_query( $sql );
while( $fetcharr = mysql_fetch_array( $result ) )
{
$id = $fetcharr[tumbon_id];
$name = $fetcharr[tumbon_name];
echo "<option value='$id'";
if ( $tumbon == $id ) //เลือกตำบลที่เลือกไว้
{
echo " selected='selected'";
};
echo ">$name</option>";
};
}
else
{
echo "<option value=''>--------------</option>";
};

//echo "</select>\",\"postcode\":\"";

echo "<label for='postcode'>".iconv("tis-620", "UTF-8", "รหัสไปรษณีย์") ." :</label>";
echo "<select name='postcode' id='postcode'>";

//ถ้ามีการเลือกอำเภอมาแล้วให้แสดงรหัสไปรษณีย์
if ( $amphur != "0" && $amphur != "" )
{
echo "<option value=''>--".iconv("tis-620", "UTF-8", "กรุณาเลือกรหัสไปรษณีย์") ."--</option>";
$sql = "SELECT amphur_id,postcode FROM amphur WHERE amphur_id=$amphur";
$result = mysql_query( $sql );
while( $fetcharr = mysql_fetch_array( $result ) )
{
$id = $fetcharr[amphur_id];
$name = $fetcharr[postcode];
echo "<option value='$id'";
if ( $postcode == $id ) //เลือกรหัสไปรษณีย์ที่เลือกไว้
{
echo " selected='selected'";
};
echo ">$name</option>";
};
}
else
{
echo "<option value=''>--------------</option>";
};
echo "</select>\"}]";

mysql_close();
?>

$id = $fetcharr[amphur_id];