1
                                                                  EXHIBIT (a)(6)
            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.
- ---------------------------------------------------------
                       ---------------------------------------------------------



    FOR THIS TYPE OF ACCOUNT:             GIVE THE
                                           SOCIAL
                                          SECURITY
                                        NUMBER OF --
- ---------------------------------------------------------
        FOR THIS TYPE OF ACCOUNT:  GIVE THE EMPLOYER
                                   IDENTIFICATION
                                   NUMBER OF --
- ---------------------------------------------------------
                             
 1.  An individual's account       The individual
 2.  Two or more individuals       The actual owner of
     (joint account)               the account or, if
                                   combined funds, any
                                   one of the
                                   individuals(1)
 3.  Husband and wife (joint       The actual owner of
     account)                      the account or, if
                                   joint funds, either
                                   person(1)
 4.  Custodian account of a minor  The minor(2)
     (Uniform Gift to Minors Act)
 5.  Adult and minor (joint        The adult or, if the
     account)                      minor is the only
                                   contributor, the
                                   minor(1)
 6.  Account in the name of        The ward, minor, or
     guardian or committee for a   incompetent person(3)
     designated ward, minor, or
     incompetent person
 7.  a. A revocable savings trust  The grantor-
        account (in which grantor  trustee(1)
        is also trustee)
     b. Any "trust" account that   The actual owner(1)
        is not a legal or valid
        trust under State Law
 8.  Sole proprietorship account   The owner(4)
 9.  A valid trust, estate, or     The legal entity (Do
     pension                       not furnish the
                                   identifying number of
                                   the personal
                                   representative or
                                   trustee unless the
                                   legal entity itself is
                                   not designated in the
                                   account title.)(5)
10.  Corporate account             The corporation
11.  Religious, charitable, or     The organization
     educational organization
     account
12.  Partnership account held in   The partnership
     the name of the business
13.  Association, club, or other   The organization
     tax-exempt organization
14.  A broker or registered        The broker or nominee
     nominee
15.  Account with the Department   The public entity
     of Agriculture in the name
     of a public entity (such as
     a State or local government,
     school district, or prison)
     that receives agricultural
     program payments


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

(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) Circle the ward's, minor's or incompetent person's name and furnish such
    person's social security number.
(4) Show the name of the owner.
(5) 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.
   2

            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9

                                     PAGE 2

OBTAINING A NUMBER

If you do not have a taxpayer identification number or you do not know your
number, obtain Form SS-5, Application for a Social Security Number Card (for
resident individuals), Form SS-4, Application for Employer Identification Number
(for businesses and all other entities), or Form W-7 for International Taxpayer
Identification Number (for alien individuals required to file U.S. Tax returns),
at an office of the Social Security Administration or the Internal Revenue
Service.

To complete the Substitute Form W-9, if you do not have a taxpayer
identification number, write "Applied For" in the space for the taxpayer
identification number in Part 1, sign and date the Form, and give it to the
requester. Generally, you will then have 60 days to obtain a taxpayer
identification number and furnish it to the requester. If the requester does not
receive your taxpayer identification number within 60 days, backup withholding,
if applicable, will begin and will continue until you furnish your taxpayer
identification number to the requester.

PAYEES EXEMPT FROM BACKUP WITHHOLDING

Payees specifically exempted from backup withholding on ALL payments 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, or a political subdivision, 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 nonexempt 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 non-resident 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 should file a Substitute Form W-9 to avoid
possible erroneous backup withholding. FILE THIS FORM WITH THE PAYER, FURNISH
YOUR TAXPAYER IDENTIFICATION NUMBER, WRITE "EXEMPT" ON THE FACE OF THE FORM, AND
RETURN IT TO THE PAYER. IF THE PAYMENTS ARE INTEREST, DIVIDENDS, OR PATRONAGE
DIVIDENDS, ALSO SIGN AND DATE THE FORM.

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 regulations under sections 6041, 6041A(a),
6045, and 6050A.

PRIVACY ACT NOTICE. -- Section 6109 requires most recipients of dividend,
interest, or other payments to give taxpayer identification numbers to payers
who must report the payments to the IRS. The IRS uses the numbers for
identification purposes. Payers must be given the numbers whether or not
recipients are required to file tax returns. Payers must generally withhold 31%
of taxable interest, dividends, and certain other payments to a payee who does
not furnish a taxpayer identification number to a payer. Certain penalties may
also apply.

PENALTIES

(1) PENALTY FOR FAILURE TO FURNISH TAXPAYER IDENTIFICATION NUMBER. -- If you
fail to furnish your taxpayer identification number 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) FAILURE TO REPORT CERTAIN DIVIDEND AND INTEREST PAYMENTS. -- If you fail to
include any portion of an includible payment for interest, dividends, or
patronage dividends in gross income, such failure will be treated as being due
to negligence and will be subject to a penalty of 5% on any portion of an
under-payment attributable to that failure unless there is clear and convincing
evidence to the contrary.

(3) 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.

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

                  FOR ADDITIONAL INFORMATION CONTACT YOUR TAX
                   CONSULTANT OR THE INTERNAL REVENUE SERVICE