EXHIBIT 99.6
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 type of
number to give the payer.
<Table>
<Caption>
- ------------------------------------------------------------
GIVE THE NAME AND
SOCIAL SECURITY
FOR THIS TYPE OF ACCOUNT: NUMBER OF --
- ------------------------------------------------------------
1. Individual The individual
2. Two or more individuals (joint The actual owner of
account) the account or, if
combined funds, the
first individual on
the account(1)
3. Custodian account of a minor The minor(2)
(Uniform Gift to Minors Act)
4. a. The usual revocable savings The grantor-
trust (grantor is also trustee) trustee(1)
b. So-called trust account that is The actual owner(1)
not a legal or valid trust
under state law
5. Sole proprietorship The owner(3)
- ------------------------------------------------------------
</Table>
<Table>
<Caption>
- ------------------------------------------------------------
GIVE THE NAME AND
EMPLOYER
IDENTIFICATION
FOR THIS TYPE OF ACCOUNT: NUMBER OF --
- ------------------------------------------------------------
6. Sole proprietorship The owner(3)
7. A valid trust, estate, or pension The legal entity
trust (Do not furnish the
identifying number
of the personal
representative or
trustee unless the
legal entity itself
is not designated
in the account
title.)(4)
8. Corporate The corporation
9. Association, club, religious, The organization
charitable, educational or other
tax-exempt organization
10. Partnership The partnership
11. A broker or registered nominee The broker or
nominee
12. 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
agriculture 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.
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 if you do not know your
number, obtain Form SS-5, Application for Social Security Number Card (for
individuals), or Form SS-4, Application for Employer Identification Number, at
the local office of the Social Security Administration or the Internal Revenue
Service (the "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 a tax under Section 501(a), or an individual
retirement plan or a custodial account under Section 403(b)(7) if the
account satisfies the requirements of Section 401(f)(2).
- 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
any 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 entity registered at all times during the tax year under the Investment
Company Act of 1940.
- A foreign central bank of issue.
PAYMENTS EXEMPT FROM BACKUP WITHHOLDING
Payments that are not subject to information reporting also are not subject to
backup withholding. For details, see sections 6041, 6041A, 6042, 6045, 6049,
6050A, and 6050N, and the regulations thereunder.
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.
- Section 404(k) distributions made by an ESOP.
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.
- Mortgage or student loan interest paid by you.
Exempt payees described above should file Form W-9 to avoid possible erroneous
backup withholding. FILE THIS FORM WITH THE PAYER, FURNISH YOUR TAXPAYER
IDENTIFICATION NUMBER, CHECK "EXEMPT" IN PART 2 OF THE FORM, SIGN AND DATE THE
FORM AND RETURN IT TO THE PAYER.
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 and to help
verify the accuracy of tax returns. Payers must be given the numbers whether or
not recipients are required to file tax returns. Payers must generally withhold
at the applicable rate with respect to 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) PENALTY FOR FAILURE TO FURNISH TAXPAYER IDENTIFICATION NUMBER.
If you fail to furnish your correct 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) CIVIL PENALTY FOR FALSE INFORMATION WITH RESPECT TO WITHHOLDING.
If you make a false statement with no reasonable basis that 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 INTERNAL REVENUE SERVICE.