Thai characters not displayed correctly in cms

[thongchart]

I made a custom defined tag for translating words from French to Thai and vice versa. While my code works fine on a standalone php page, once the code is run on cms page the Thai characters are replaced by funky characters.

My data is stored in the cms database that I changed to tis620 (table and column as well that stores the Thai script). I set on the global metadata charset=TIS-620 as well... still the Thai characters are not displayed properly. I tried many settings combination without success, don't know anymore where to look at given my poor knowledge.

For info the code:

If ($_POST['cboSearchType'] == 'ThaiWord')
$WordToShow = 'FrenchWord';
else $WordToShow = 'ThaiWord';

include("CustomPages/variables.inc.php");
mysql_connect($MySqlServer, $MySqlLogin, $MySqlPassword) or die(mysql_error());
mysql_select_db($MySqlDb) or die(mysql_error());
$charset="SET NAMES 'tis620'";
mysql_query($charset) or die('Invalid query: ' . mysql_error());
$Sql = "SELECT * FROM tblj_dic WHERE " . $_POST['cboSearchType'] . " = '" . $_POST['txtSearchCriteria'] . "'";
$SqlResult = mysql_query($Sql);

$Row = mysql_fetch_array($SqlResult);

mysql_close();
if ($Row[$WordToShow] == '')
echo 'Pas de resultat pour "' . $_POST['txtSearchCriteria'] . '"';
echo $Row[$WordToShow] . '' . $Row['Tone1'];

Help would be greatly appreciated!

[thongchart]

Found a solution... after changing in config.php the encoding to tis620, it was working, but then any Thai language stored in content_xx tables (even set as tis620 as well) was not displayed properly.

So what I did is restore utf8 as encoding everywhere (db, site settings). When querying the database from my custom page, I have to run this little query in order to get the correct encoding:

$charset="SET NAMES 'utf8'";
mysql_query($charset) or die('Invalid query: ' . mysql_error());

Now my Thai characters are displayed properly and can be queried in cms pages and custom pages.