<PAGE>
Exhibit (a)(4)
GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
NUMBER ON SUBSTITUTE FORM W-9
Guidelines for Determining the Proper Identification Number for the Payee
(You) 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. All "Section" references are to
the Internal Revenue Code of 1986, as amended. "IRS" is the Internal Revenue
Service.
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<TABLE>
<CAPTION>
Give the
For this type of SOCIAL SECURITY
account: number of--
--------------------------------------------
<S> <C>
1. Individual The individual
2. Two or more The actual owner of
individuals (joint the account or, if
account) combined funds, the
first individual on
the account(1)
3. Custodian account of The minor(2)
a minor (Uniform
Gift to Minors Act)
4.a. The usual The grantor-
revocable savings trustee(1)
trust account
(grantor is also
trustee)
b. So-called trust The actual owner(1)
account that is not
a legal or valid
trust under state
law
5. Sole proprietorship The owner(3)
</TABLE>
<TABLE>
<CAPTION>
Give the EMPLOYER
For this type of IDENTIFICATION
account: number of--
--
<S> <C>
6.Sole proprietorship The owner(3)
7. A valid trust, The legal entity(4)
estate, or pension
trust
8. Corporate The corporation
9. Association, club, The organization
religious,
charitable,
educational, or
other tax-exempt
organization
10. Partnership The partnership
11. A broker or The broker or
registered nominee nominee
12. Account with the The public entity
Department 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
-------------------------------------------
--
</TABLE>
(1) List first and circle the name of the person whose number you furnish. If
only one person on a joint account has a social security number, that
person's number must be furnished.
(2) Circle the minor's name and furnish the minor's social security number.
(3) You must show your individual name, but you may also enter your business
or "doing business as" name. You may use either your social security
number or your employer identification number (if you have one).
(4) List first and circle the name of the legal trust, estate, or pension
trust. (Do not furnish the taxpayer identification number of the personal
representative or trustee unless the legal entity itself is not designated
in the account title).
Note: If no name is circled when there is more than one name listed, the
number will be considered to be that of the first name listed.
<PAGE>
GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
NUMBER ON SUBSTITUTE FORM W-9
Page 2
Obtaining a Number
If you don't have a taxpayer identification number or you don't know your
number, obtain Internal Revenue Service Form SS-5, Application for a Social
Security Administration office, or Form SS-4, Application for Employer
Identification Number, by calling 1 (800) TAX-FORM, and apply for a number.
Payees Exempt from Backup Withholding
Payees specifically exempted from the withholding include
. An organization exempt from tax under Section 501(a), an individual
retirement account (IRA), or a custodial account under Section 403(b)(7),
if the account satisfies the requirements of Section 401(f)(2).
. The United States or a state thereof, the District of Columbia, a
possession of the United States, or a political subdivision or wholly
owned agency or instrumentality of any of the foregoing.
. An international organization or any agency or instrumentality thereof.
. A foreign government and any political subdivision, agency or
instrumentality thereof.
Payees that may be exempt from backup withholding include:
. A corporation.
. A financial institution.
. A dealer of securities or commodities required to register in the United
States, the District of Columbia, a possession of the United States.
. A real estate investment trust.
. A common trust fund operated by a bank under Section 584(a).
. An entity registered at all times during the tax year under the Investment
Company Act of 1940.
. A middleman known in the investment community as a nominee or who is
listed in the most recent publication of the American Society of Corporate
Secretaries, Inc. Nominee List.
. A futures commission merchant registered with the Commodity Futures
Trading Commission.
. A foreign central bank.
Payees of dividends and patronage dividends generally exempt from backup
withholding include:
. Payments to nonresident aliens subject to withholding under Section 1441.
. Payments to partnerships not engaged in a trade or business in the United
States and that have at least one nonresident alien partner.
. Payments of patronage dividends not paid in money.
. Payments made by certain foreign organizations.
. Section 404(k) payments made by an ESOP.
Payees of interest generally exempt from backup withholding include:
. 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.
Certain payments, other than payments of interest, dividends, and patronage
dividends, that are exempt from information reporting are also exempt from
backup withholding. For details, see Sections 6041, 6041A, 6042, 6044, 6045,
60499, 6050A and 6050N and the regulations thereunder.
Exempt payees should complete a substitute Form W-9 to avoid possible
erroneous backup withholding. Furnish your taxpayer identification number,
write "EXEMPT" on the form, sign and date the form and return it to the payer.
Privacy Act Notice.--Section 6019 requires you to provide your correct
taxpayer identification number to payers, who must report the payments to the
IRS. The IRS uses the numbers for identification purposes and to help verify
the accuracy of your return and may also provide this information to various
government agencies for tax enforcement or litigation 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, dividend, 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) 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 willful neglect.
(2) Civil Penalty for False Information With Respect to Withholding.--If you
make a false statement with no reasonable basis that results in no backup
withholding, you are subject to a $500 penalty.
(3) Criminal Penalty for Falsifying Information.--Willfully 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.
