EXHIBIT 99.6
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.
<Table>
<Caption>
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GIVE THE
SOCIAL SECURITY
FOR THIS TYPE OF ACCOUNT: NUMBER OF --
- ------------------------------------------------------------
1. Individual The individual
2. Two or more individuals (joint or, The actual owner of
account) the account 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 account (grantor is also trustee(1)
trustee)
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 EMPLOYER
IDENTIFICATION
FOR THIS TYPE OF ACCOUNT: NUMBER OF --
- ------------------------------------------------------------
6. A valid trust, estate, or pension The legal entity(4)
trust
7. Corporate The corporation
8. Association, club, religious, The organization
charitable, educational, or other
tax-exempt organization account
9. Partnership The partnership
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>
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- ------------------------------------------------------------
(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:
(i) 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.
(ii) If you are an individual, you must generally provide the name
shown on your social security card. However, if you have changed
your last name, for instance, due to marriage, without informing
the Social Security Administration of the name change, please
enter your first name, the last name shown on your social security
card, and your new last name.
(iii) For a joint account, only the person whose taxpayer identification
number is shown on the Substitute Form W-9 should sign the form.
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, obtain Form SS-5,
Application for a Social Security Card, at your local Social Security
Administration office, or Form SS-4, Application for Employer Identification
Number (for business and all other entities), by calling 1 (800) TAX-FORM or
from your local office of the Internal Revenue Service, and apply for a number.
PAYEES EXEMPT FROM BACKUP WITHHOLDING
Payees specifically exempted from withholding include:
- An organization exempt from tax under section 501(a), an individual
retirement account (IRA), or a custodial account under Section 403(b)(2), if
the account satisfies the requirements of Section 401(f)(7).
- 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 one or more 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 in securities or commodities required to register in the United
States, the District of Columbia, or 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 custodian.
- A futures commission merchant registered with the Commodity Futures Trading
Commission.
- A foreign central bank of issue.
Payments 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.
Payments of interest generally exempt from backup withholding include:
- Payments of interest on obligations issued by individuals. Note: You may be
subject to backup withholding if this interest is $600 or more 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 interest paid to you.
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,
6049, 6050A and 6050N.
EXEMPT PAYEES DESCRIBED ABOVE MUST FILE FORM W-9 OR A SUBSTITUTE FORM W-9 TO
AVOID POSSIBLE ERRONEOUS BACKUP WITHHOLDING. FILE THIS FORM WITH THE PAYER.
FURNISH YOUR TAXPAYER IDENTIFICATION NUMBER, CHECK THE BOX "EXEMPT FROM BACKUP
WITHHOLDING" ON FORM W-9 OR CHECK THE BOX IN PART 2 OF THE SUBSTITUTE FORM W-9,
AND RETURN TO THE PAYER. ALSO SIGN AND DATE THE FORM.
PRIVACY ACT NOTICE -- Section 6109 requires you to provide your correct taxpayer
identification number to payers, who must report the payments to the IRS. The
IRS uses the number for identification purposes 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 30% 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
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 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.