SQL & PL/SQL

Dear Members,

How do we pass parameters to the control file using sql*loader. Suppose i have a control file like this :

LOAD DATA
CHARACTERSET WE8ISO8859P1
INFILE 'San Nicolas Weekly 20080117.csv'
APPEND
INTO TABLE hrconv.xcel_person_mx_s2
FIELDS TERMINATED BY ',' optionally enclosed by '"'
trailing nullcols
(legacy_id,
employee_number,
first_name,
middle_names,
last_name,
per_information1,
per_information2,
ppos_attribute1,
date_of_birth2,
ppos_attribute2,
per_information3,
cost_center,
original_date_of_hire,
person_type,
salary_hour,
probation_period_date,
probation_period_end,
probation_period_end2,
sex,
account_number1,
bank_card_number,
national_identifier,
leaving_reason,
company,
marital_status,
actual_termination_date,
ppos_attribute3,
per_information4)

I want the File Name in the INFILE clause to be passed dynamically. i.e for example in the above control file i want 'San Nicolas Weekly 20080117.csv' to be passed dynamically, so that i can have one control file for several data files.

I should do this as a concurrent request . How can we do this. It would be great if any body helps me.

Thanks
Sandeep