Oracle Database Discussions

hi,

i trying to specify charset in my pdo db connection beacause results of my request doesn't show accents (éàèô->eaeo).
Request is done in a php sript.

Is it possible to specify charset during connection establisment?
I can't change oracle configuration, I have only permission to read.
My connection sript is below.

$tns = "
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = ip)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = dbname)
)
)
";

try{
$dbo = new PDO("oci:dbname=".$tns,user,pass);
}catch(PDOException $e){
echo ($e->getMessage());
}

Oracle settings

-------------------
SELECT * FROM sys.props$ WHERE name LIKE 'NLS%' ;

NAME VALUE$ COMMENT$
NLS_LANGUAGE AMERICAN Language
NLS_TERRITORY AMERICA Territory
NLS_CURRENCY $ Local currency
NLS_ISO_CURRENCY AMERICA ISO currency
NLS_NUMERIC_CHARACTERS ., Numeric characters
NLS_CHARACTERSET WE8MSWIN1252 Character set
NLS_CALENDAR GREGORIAN Calendar system
NLS_DATE_FORMAT DD-MON-RR Date format
NLS_DATE_LANGUAGE AMERICAN Date language
NLS_SORT BINARY Linguistic definition
NLS_TIME_FORMAT HH.MI.SSXFF AM Time format
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM Time stamp format
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZR Time with timezone format
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR Timestamp with timezone format
NLS_DUAL_CURRENCY $ Dual currency symbol
NLS_COMP BINARY NLS comparison
NLS_LENGTH_SEMANTICS BYTE NLS length semantics
NLS_NCHAR_CONV_EXCP FALSE NLS conversion exception
NLS_NCHAR_CHARACTERSET AL16UTF16 NCHAR Character set
NLS_RDBMS_VERSION 9.2.0.1.0 RDBMS version for NLS parameters
--------------------

lot of thanks for your help.

waiter