ADDENDUM FOR EMPLOYEES IN SINGAPORE

TAX INFORMATION

         This addendum does not discuss all of the tax consequences that may be
relevant to you in your particular circumstances, but is merely intended to
alert you to some of the tax information you may want to consider in making your
decision.

         Generally, the grant of new options should not be a taxable event under
the Income Tax Act. However, although we do not believe there will be a tax
liability in connection with the tender of your eligible options, this is not
completely certain.

         Effective 1 April 2001, new legislation provides favorable tax
treatment for stock options, provided that certain requirements are satisfied.
It is possible that the new options may be structured to achieve such favorable
tax consequences for all or a portion of the new options, but no assurances can
be given to that effect.

         Please note that tax laws change frequently and vary with your
individual circumstances. Please consult a tax advisor to determine the tax
considerations and tax consequences relevant to your participation in the offer.