SQL & PL/SQL

Example:
CREATE TABLE TEMP(
TEMP_ID INTEGER;
TEMP_DATA DECIMAL(9,6)
)

File with data (for example temp.dat):
“1”,”34,67”
“2”,”56,87”

Control file for sql*loader(for example temp.ctl)
LOAD DATA
INFILE temp.dat
INTO TABLE TEMP
FIELDS TERMINATED BY ","
OPTIONALLY ENCLOSED BY '"'
(TEMP_ID INTEGER EXTERNAL;
TEMP_DATA DECIMAL EXTERNAL)

This example is working very well.
If I change loaded data and replace comma for dot(I have data like this, look below)
“1”,”34.67”
“2”,”56.87”
I can not load those to table temp, for example.
How can I force sql*loader to load decimal data with dot?

Thank you.
(Win xp with oracle 10g)