EXHIBIT (a)(1)(F)
            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9

GUIDELINES FOR DETERMINING THE PROPER IDENTIFICATION NUMBER TO GIVE THE
PAYER -- Social Security numbers have nine digits separated by two hyphens:
i.e., 000-00-0000. Employer identification numbers have nine digits separated by
only one hyphen: i.e., 00-0000000. The table below will help determine the
number to give the payer.

       ------------------------------------------------------------------

<Table>
                                    
                                          GIVE THE SOCIAL SECURITY
FOR THIS TYPE OF ACCOUNT:                 NUMBER OF --
- ----------------------------------------------------------------------
 1.  An individual's account.             The individual.
 2.  Two or more individuals (joint       The actual owner of the ac-
     account).                            count or, if combined funds,
                                          any one of the
                                          individuals(1).
 3.  Custodian account of a minor         The minor(2).
     (Uniform Gift to Minors Act).
 4.  a. The usual revocable savings       The grantor-trustee(1).
     trust account (grantor is also
        trustee).
     b. So-called trust account that      The actual owner(1).
     is not a legal or valid trust
        under State law.
 5.  Sole proprietorship account.         The owner(3).
 6.  A valid trust, estate, or pension    Legal entity (Do not furnish
     fund.                                the identifying number of
                                          the personal representative
                                          or trustee unless the legal
                                          entity itself is not
                                          designated in the account
                                          title)(4).
 7.  Corporate account.                   The corporation.
 8.  Partnership account held in the      The partnership.
     name of the business.
 9.  Association, club, or other          The organization.
     tax-exempt organization.
10.  A broker or registered nominee.      The broker or nominee.
11.  Account with the Department of       The public entity.
     Agriculture in the name of a
     public entity (such as a State or
     local government, school
     district, or prison) that
     receives agricultural program
     payments.
</Table>

- ------------------------------------------------------------------

(1) List first and circle the name of the person whose number you furnish.
(2) Circle the minor's name and furnish the minor's social security number.
(3) Show the name of the owner. The name of the business or the "doing business
    as" name may also be entered. Either the social security number or the
    employer identification number may be used.
(4) List first and circle the name of the legal trust, estate or pension trust.

NOTE: If no name is circled when there is more than one name, the number will be
      considered to be that of the first name listed.

OBTAINING A NUMBER

If you don't have a taxpayer identification number ("TIN") or you don't know
your number, obtain Form SS-5, Application for a Social Security Number Card, or
Form SS-4, Application for Employer Identification Number, at the local office
of Social Security Administration or the Internal Revenue Service ("IRS") and
apply for a number.

PAYEES EXEMPT FROM BACKUP WITHHOLDING

Payees specifically exempted from backup withholding on all dividend and
interest payments and on broker transactions include the following:

- - A corporation.
- - A financial institution.
- - An organization exempt from tax under section 501(a), or an individual
  retirement plan, or a custodial account under section 403(b)(7).
- - The United States or any agency or instrumentality thereof.
- - A State, the District of Columbia, a possession of the United States, or any
  subdivision or instrumentality thereof.
- - A foreign government, a political subdivision of a foreign government, or
  agency or instrumentality thereof.
- - An international organization or any agency or instrumentality thereof.
- - A registered dealer in securities or commodities registered in the U.S. or a
  possession of the U.S.
- - A real estate investment trust.
- - A common trust fund operated by a bank under section 584(a).
- - An exempt charitable remainder trust or a non-exempt trust described in
  section 4947(a)(1).
- - An entity registered at all times under the Investment Company Act of 1940.
- - A foreign central bank of issue.

  Payments of dividends and patronage dividends not generally subject to backup
withholding include the following:
- - Payments to nonresident aliens subject to withholding under section 1441.
- - Payments to partnerships not engaged in a trade or business in the U.S. and
  which have at least one nonresident partner.
- - Payments of patronage dividends where the amount received is not paid in
  money.
- - Payments made by certain foreign organizations.
- - Payments made to a nominee.

  Payments of interest not generally subject to backup withholding include the
following:
- - Payments of interest on obligations issued by individuals.

NOTE: You may be subject to backup withholding if this interest is $600 or more
and is paid in the course of the payer's trade or business and you have not
provided your correct taxpayer identification number to the payer.
- - Payments of tax-exempt interest (including exempt-interest dividends under
  section 852).
- - Payments described in section 6049(b)(5) to nonresident aliens.
- - Payments on tax-free covenant bonds under section 1451.
- - Payments made by certain foreign organizations.
- - Payments made to a nominee.

Exempt payees described above nevertheless should file the Substitute Form W-9
to avoid possible erroneous backup withholding. Complete the substitute Form W-9
as follows: FURNISH YOUR TIN, WRITE "EXEMPT" ACROSS THE FACE OF THE FORM, AND
RETURN THE FORM TO THE PAYER.

  Certain payments other than interest, dividends, and patronage dividends that
are not subject to information reporting are also not subject to backup
withholding. For details, see the Treasury regulations under sections 6041,
6041A(a), 6045, 6050A. (All "section" references herein are to the Internal
Revenue Code of 1986).

PRIVACY ACT NOTICE -- Section 6109 requires you to furnish your correct TIN to
persons who must file information returns with the IRS to report interest,
dividends, and certain other income paid to you, mortgage interest you paid, the
acquisition or abandonment of secured property, or contributions you made to an
IRA. The IRS uses the numbers for identification purposes and to help verify the
accuracy of your tax return. Payers must generally withhold 30% of taxable
interest, dividend, and certain other payments to a payee who does not furnish a
TIN to a payer. Certain penalties may also apply.

PENALTIES

(1) PENALTY FOR FAILURE TO FURNISH TIN -- If you fail to furnish your TIN to a
payer, you are subject to a penalty of $50 for each such failure unless your
failure is due to reasonable cause and not to willful neglect.

(2) CIVIL PENALTY FOR FALSE INFORMATION WITH RESPECT TO WITHHOLDING -- If you
make a false statement with no reasonable basis which results in no imposition
of backup withholding, you are subject to a penalty of $500.

(3) CRIMINAL PENALTY FOR FALSIFYING INFORMATION -- Willfully falsifying
certifications or affirmations may subject you to criminal penalties including
fines and/or imprisonment.

(4) MISUSE OF TAXPAYER IDENTIFICATION NUMBERS -- If the payer discloses or uses
taxpayer identification numbers in violation of Federal law, the payer may be
subject to civil and criminal penalties.

                  FOR ADDITIONAL INFORMATION CONTACT YOUR TAX
                             CONSULTANT OR THE IRS.