Document:

<PAGE>   1
                                                                     EXHIBIT 4.1

COMMON STOCK                                                        COMMON STOCK
NUMBER
                                                          SHARES
                              [PETS.COM, INC. LOGO]

                                                  CUSIP 71676K 10 9 US71676K1097
                                                                 SEE REVERSE FOR
                                                            CERTAIN RESTRICTIONS

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

This Certifies that

is the owner of

            FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK,
                             $0.00125 PAR VALUE, OF

                                 PETS.COM, INC.

transferable only on the books of the Corporation by the holder hereof in person
or by duly authorized Attorney upon surrender of this certificate properly
endorsed. This certificate is not valid until countersigned and registered by
the Transfer Agent and Registrar.

        WITNESS the facsimile seal of the Corporation and the facsimile
signatures of its duly authorized officers.

Dated _________________________

                         [PETS.COM, INC. Corporate Seal]

      /s/ JOHN V.BAUTISTA                        /s/ JULIA L. WAINWRIGHT
           SECRETARY                             CHIEF EXECUTIVE OFFICER

                                                 COUNTERSIGNED AND REGISTERED:

                                                 U.S. STOCK TRANSFER CORPORATION

                                                 TRANSFER AGENT AND REGISTRAR

                                                 BY____________________________
                                                 AUTHORIZED SIGNATURE

<PAGE>   2

                                 PETS.COM, INC.

        The Corporation will furnish without charge to each stockholder who so
requests a copy of the powers, designations, preferences and relative,
participating, optional or other special rights to each class of stock or series
thereof, and the qualifications, limitations, or restrictions of such
preferences and/or rights.

        The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM --as tenants in common    UNIF GIFT MIN ACT   _______ Custodian ________
TEN ENT --as tenants by the                            (Cust)            (Minor)
          entireties                                    under Uniform Trans to
JT TEN  --as joint tenants                                    Minors Act
          with right of                               __________________________
          survivorship and not                                       (State)
          as tenants in common

     Additional abbreviations may also be used though not in the above list.

FOR VALUE RECEIVED, ______________________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
    IDENTIFYING NUMBER OF ASSIGNEE

_______________________________

_______________________________

________________________________________________________________________________
(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

________________________________________________________________________________
_____________________________________Shares represented by the within
Certificate, and do hereby irrevocably constitute and appoint __________________
_______________________________________________________Attorney to transfer the
said shares on the books to the within named Corporation with full power of
substitution in the premises.

Dated:______________________________

                                        X_______________________________________

                                        X_______________________________________
                               NOTICE:  THE SIGNATURE(S) TO THIS ASSIGNMENT MUST
                                        CORRESPOND WITH THE NAME(S) AS WRITTEN
                                        UPON THE FACE OF THE CERTIFICATE IN
                                        EVERY PARTICULAR, WITHOUT ALTERATION OR
                                        ENLARGEMENT OR ANY CHANGE WHATEVER.

THE SIGNATURES(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION
(BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH
MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO
S.E.C. RULE 17Ad-15.

SIGNATURE(S) GUARANTEED BY:

___________________________________<PAGE>   1
                                                                  EXHIBIT 10.2.1

                                 PETS.COM, INC.

                                 1999 STOCK PLAN

                          (AS AMENDED DECEMBER 5, 1999)

     1. PURPOSES OF THE PLAN. The purposes of this 1999 Stock Plan are to
attract and retain the best available personnel for positions of substantial
responsibility, to provide additional incentive to Employees and Consultants of
the Company and its Subsidiaries and to promote the success of the Company's
business. Options granted under the Plan may be Incentive Stock Options (as
defined under Section 422 of the Code) or Nonstatutory Stock Options, as
determined by the Administrator at the time of grant of an Option and subject to
the applicable provisions of Section 422 of the Code, as amended, and the
regulations promulgated thereunder. Stock Purchase Rights may also be granted
under the Plan.

     2. DEFINITIONS. As used herein, the following definitions shall apply:

          (a) "ADMINISTRATOR" means the Board or its Committee appointed
pursuant to Section 4 of the Plan.

          (b) "AFFILIATE" means an entity other than a Subsidiary in which the
Company owns an equity interest or which, together with the Company, is under
common control of a third person or entity.

          (c) "APPLICABLE LAWS" means the legal requirements relating to the
administration of stock option plans under applicable U.S. state corporate laws,
U.S. federal and applicable state securities laws, the Code, any Stock Exchange
rules or regulations and the applicable laws of any other country or
jurisdiction where Options or Stock Purchase Rights are granted under the Plan,
as such laws, rules, regulations and requirements shall be in place from time to
time.

          (d) "BOARD" means the Board of Directors of the Company.

          (e) "CODE" means the Internal Revenue Code of 1986, as amended.

          (f) "COMMITTEE" means one or more committees or subcommittees of the
Board appointed by the Board to administer the Plan in accordance with Section 4
below.

          (g) "COMMON STOCK" means the Common Stock of the Company.

          (h) "COMPANY" means Pets.com, Inc., a Delaware corporation.

          (i) "CONSULTANT" means any person, including an advisor, who renders
services to the Company, or any Parent, Subsidiary or Affiliate, and is
compensated for such services, and any Director of the Company whether
compensated for such services or not.

<PAGE>   2

          (j) "CONTINUOUS SERVICE STATUS" means the absence of any interruption
or termination of service as an Employee or Consultant to the Company or a
Parent, Subsidiary or Affiliate. Continuous Service Status shall not be
considered interrupted in the case of: (i) sick leave; (ii) military leave;
(iii) any other leave of absence approved by the Administrator, provided that
such leave is for a period of not more than 90 days, unless reemployment upon
the expiration of such leave is guaranteed by contract or statute, or unless
provided otherwise pursuant to Company policy adopted from time to time; or (iv)
in the case of transfers between locations of the Company or between the
Company, its Parents, Subsidiaries or Affiliates or their respective successors.
Unless otherwise determined by the Administrator, a change in status from an
Employee to a Consultant or from a Consultant to an Employee will not constitute
an interruption of Continuous Service Status.

          (k) "CORPORATE TRANSACTION" means a sale of all or substantially all
of the Company's assets, or a merger, consolidation or other capital
reorganization of the Company with or into another corporation.

          (l) "DIRECTOR" means a member of the Board.

          (m) "EMPLOYEE" means any person, including officers and Directors,
employed by the Company or any Parent, Subsidiary or Affiliate of the Company.
The payment by the Company of a director's fee to a Director shall not be
sufficient to constitute "employment" of such Director by the Company.

          (n) "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
amended.

          (o) "FAIR MARKET VALUE" means, as of any date, the fair market value
of Common Stock determined as follows:

               (i) If the Common Stock is listed on any established stock
exchange or a national market system including without limitation the National
Market of the National Association of Securities Dealers, Inc. Automated
Quotation ("Nasdaq") System, its Fair Market Value shall be the closing sales
price for such stock (or the closing bid, if no sales were reported), as quoted
on such system or exchange on the date of determination, or if no trading
occurred on the date of determination, on the last market trading day prior to
the time of determination, as reported in The Wall Street Journal or such other
source as the Administrator deems reliable;

               (ii) If the Common Stock is quoted on the Nasdaq System (but not
on the National Market thereof) or regularly quoted by a recognized securities
dealer but selling prices are not reported, its Fair Market Value shall be the
mean between the high bid and low asked prices for the Common Stock for the last
market trading day prior to the time of determination, as reported in The Wall
Street Journal or such other source as the Administrator deems reliable; or

               (iii) In the absence of an established market for the Common
Stock, the Fair Market Value thereof shall be determined in good faith by the
Administrator.

                                       -2-

<PAGE>   3

          (p) "INCENTIVE STOCK OPTION" means an Option intended to qualify as an
incentive stock option within the meaning of Section 422 of the Code, as
designated in the applicable Option Agreement.

          (q) "LISTED SECURITY" means any security of the Company that is listed
or approved for listing on a national securities exchange or designated or
approved for designation as a national market system security on an interdealer
quotation system by the National Association of Securities Dealers, Inc.

          (r) "NONSTATUTORY STOCK OPTION" means an Option not intended to
qualify as an Incentive Stock Option, as designated in the applicable Option
Agreement.

          (s) "OPTION" means a stock option granted pursuant to the Plan.

          (t) "OPTION AGREEMENT" means a written document, the form(s) of which
shall be approved from time to time by the Administrator, reflecting the terms
of an Option granted under the Plan and includes any documents attached to or
incorporated into such Option Agreement, including, but not limited to, a notice
of stock option grant and a form of exercise notice.

          (u) "OPTION EXCHANGE PROGRAM" means a program approved by the
Administrator whereby outstanding Options are exchanged for Options with a lower
exercise price.

          (v) "OPTIONED STOCK" means the Common Stock subject to an Option or a
Stock Purchase Right.

          (w) "OPTIONEE" means an Employee or Consultant who receives an Option.

          (x) "PARENT" means a "parent corporation," whether now or hereafter
existing, as defined in Section 424(e) of the Code, or any successor provision.

          (y) "PARTICIPANT" means any holder of one or more Options or Stock
Purchase Rights, or of the Shares issuable or issued upon exercise of such
awards, under the Plan.

          (z) "PLAN" means this 1999 Stock Plan.

          (aa) "REPORTING PERSON" means an officer, Director, or greater than
10% shareholder of the Company within the meaning of Rule 16a-2 under the
Exchange Act, who is required to file reports pursuant to Rule 16a-3 under the
Exchange Act.

          (bb) "RESTRICTED STOCK" means shares of Common Stock acquired pursuant
to a grant of a Stock Purchase Right under Section 10 below.

          (cc) "RESTRICTED STOCK PURCHASE AGREEMENT" means a written document,
the form(s) of which shall be approved from time to time by the Administrator,
reflecting the terms of a Stock Purchase Right granted under the Plan and
includes any documents attached to such agreement.

                                      -3-

<PAGE>   4

          (dd) "RULE 16b-3" means Rule 16b-3 promulgated under the Exchange Act,
as the same may be amended from time to time, or any successor provision.

          (ee) "SHARE" means a share of the Common Stock, as adjusted in
accordance with Section 13 of the Plan.

          (ff) "STOCK EXCHANGE" means any stock exchange or consolidated stock
price reporting system on which prices for the Common Stock are quoted at any
given time.

          (gg) "STOCK PURCHASE RIGHT" means the right to purchase Common Stock
pursuant to Section 10 below.

          (hh) "SUBSIDIARY" means a "subsidiary corporation," whether now or
hereafter existing, as defined in Section 424(f) of the Code, or any successor
provision.

          (ii) "TEN PERCENT HOLDER" means a person who owns stock representing
more than 10% of the voting power of all classes of stock of the Company or any
Parent or Subsidiary.

     3. STOCK SUBJECT TO THE PLAN. Subject to the provisions of Section 13 of
the Plan, the maximum aggregate number of Shares that may be sold under the Plan
is 5,815,327 Shares of Common Stock, plus an automatic annual increase on the
first day of each of the Company's fiscal years beginning in 2001 and ending in
2009 equal to the lesser of : (i) 800,000 Shares; (ii) three percent (3%) of
the Shares outstanding on the last day of the immediately preceding fiscal year;
or (iii) such lesser number of shares as is determined by the Board of
Directors. The Shares may be authorized, but unissued, or reacquired Common
Stock. If an Option expires or becomes unexercisable for any reason without
having been exercised in full, or is surrendered pursuant to an Option Exchange
Program, the unpurchased Shares that were subject thereto shall, unless the Plan
shall have been terminated, become available for future grant under the Plan. In
addition, any Shares of Common Stock that are retained by the Company upon
exercise of an Option or Stock Purchase Right in order to satisfy the exercise
or purchase price for such Option or Stock Purchase Right or any withholding
taxes due with respect to such exercise shall be treated as not issued and shall
continue to be available under the Plan. Shares issued under the Plan and later
repurchased by the Company pursuant to any repurchase right that the Company may
have shall not be available for future grant under the Plan.

     4. ADMINISTRATION OF THE PLAN.

          (a) GENERAL. The Plan shall be administered by the Board or a
Committee, or a combination thereof, as determined by the Board. The Plan may be
administered by different administrative bodies with respect to different
classes of Optionees and, if permitted by the Applicable Laws, the Board may
authorize one or more officers to grant Options or Stock Purchase Rights under
the Plan.

                                      -4-

<PAGE>   5

          (b) ADMINISTRATION WITH RESPECT TO REPORTING PERSONS. With respect to
Options granted to Reporting Persons and Named Executives, the Plan may (but
need not) be administered so as to permit such Options to qualify for the
exemption set forth in Rule 16b-3 and to qualify as performance-based
compensation under Section 162(m) of the Code.

          (c) COMMITTEE COMPOSITION. If a Committee has been appointed pursuant
to this Section 4, such Committee shall continue to serve in its designated
capacity until otherwise directed by the Board. From time to time the Board may
increase the size of any Committee and appoint additional members thereof,
remove members (with or without cause) and appoint new members in substitution
therefor, fill vacancies (however caused) and remove all members of a Committee
and thereafter directly administer the Plan, all to the extent permitted by the
Applicable Laws and, in the case of a Committee administering the Plan pursuant
to Section 4(b) above, to the extent permitted or required by Rule 16b-3 and
Section 162(m) of the Code.

          (d) POWERS OF THE ADMINISTRATOR. Subject to the provisions of the Plan
and in the case of a Committee, the specific duties delegated by the Board to
such Committee, and subject to the approval of any relevant authorities,
including the approval, if required, of any Stock Exchange, the Administrator
shall have the authority, in its discretion:

               (i) to determine the Fair Market Value of the Common Stock, in
accordance with Section 2 (o) of the Plan;

               (ii) to select the Consultants and Employees to whom Options and
Stock Purchase Rights or any combination thereof may from time to time be
granted;

               (iii) to determine whether and to what extent Options and Stock
Purchase Rights or any combination thereof are granted;

               (iv) to determine the number of Shares of Common Stock to be
covered by each such award granted hereunder;

               (v) to approve forms of agreement for use under the Plan;

               (vi) to determine the terms and conditions, not inconsistent with
the terms of the Plan, of any award granted hereunder, which terms and
conditions include but are not limited to the exercise or purchase price, the
time or times when Options or Stock Purchase Rights may be exercised (which may
be based on performance criteria), any vesting acceleration or waiver of
forfeiture restrictions, and any restriction or limitation regarding any Option,
Optioned Stock, Stock Purchase Right or Restricted Stock, based in each case on
such factors as the Administrator, in its sole discretion, shall determine;

               (vii) to determine whether and under what circumstances an Option
may be settled in cash under Section 9(f) instead of Common Stock;

               (viii) to reduce the exercise price of any Option to the then
current Fair Market Value if the Fair Market Value of the Common Stock covered
by such Option shall have

                                      -5-

<PAGE>   6

declined since the date the Option was granted and to make any other amendments
or adjustments to any Option that the Administrator determines, in its
discretion and under the authority granted to it under the Plan, to be necessary
or advisable, provided however that no amendment or adjustment to an Option that
would materially and adversely affect the rights of any Optionee shall be made
without the prior written consent of the Optionee;

               (ix) to determine the terms and restrictions applicable to Stock
Purchase Rights and the Restricted Stock purchased by exercising such Stock
Purchase Rights;

               (x) to initiate an Option Exchange Program;

               (xi) to construe and interpret the terms of the Plan and awards
granted under the Plan; and

               (xii) in order to fulfill the purposes of the Plan and without
amending the Plan, to modify grants of Options or Stock Purchase Rights to
Participants who are foreign nationals or employed outside of the United States
in order to recognize differences in local law, tax policies or customs.

          (e) EFFECT OF ADMINISTRATOR'S DECISION. All decisions, determinations
and interpretations of the Administrator shall be final and binding on all
Participants.

     5. ELIGIBILITY.

          (a) RECIPIENTS OF GRANTS. Nonstatutory Stock Options and Stock
Purchase Rights may be granted to Employees and Consultants. Incentive Stock
Options may be granted only to Employees; provided however that Employees of
Affiliates shall not be eligible to receive Incentive Stock Options. An Employee
or Consultant who has been granted an Option or Stock Purchase Right may, if he
or she is otherwise eligible, be granted additional Options or Stock Purchase
Rights.

          (b) TYPE OF OPTION. Each Option shall be designated in the Option
Agreement as either an Incentive Stock Option or a Nonstatutory Stock Option.
However, notwithstanding such designations, to the extent that the aggregate
Fair Market Value of Shares with respect to which Options designated as
Incentive Stock Options are exercisable for the first time by any Optionee
during any calendar year (under all plans of the Company or any Parent or
Subsidiary) exceeds $100,000, such excess Options shall be treated as
Nonstatutory Stock Options. For purposes of this Section 5(b), Incentive Stock
Options shall be taken into account in the order in which they were granted, and
the Fair Market Value of the Shares subject to an Incentive Stock Option shall
be determined as of the date of grant of such Option.

          (c) AT-WILL RELATIONSHIP. The Plan shall not confer upon any
Participant any right with respect to continuation of employment or consulting
relationship with the Company, nor shall it interfere in any way with such
holder's right or the Company's right to terminate his or her employment or
consulting relationship at any time, with or without cause.

                                       -6-

<PAGE>   7

          (d) LIMITATION ON GRANTS TO EMPLOYEES. Subject to adjustment as
provided in Section 13 below, the maximum number of Shares which may be subject
to Options and Stock Purchase Rights and granted to any one Employee under this
Plan for any fiscal year of the Company shall be 2,000,000 Shares.

     6. TERM OF PLAN. The Plan shall become effective upon its adoption by the
Board. It shall continue in effect for a term of ten years unless sooner
terminated under Section 15 of the Plan.

     7. TERM OF OPTION. The term of each Option shall be the term stated in the
Option Agreement; provided, however, that the term shall be no more than ten
years from the date of grant thereof or such shorter term as may be provided in
the Option Agreement. However, in the case of an Incentive Stock Option granted
to an Optionee who, at the time the Option is granted, is a Ten Percent Holder,
the term of such Option shall be five years from the date of grant thereof or
such shorter term as may be provided in the Option Agreement.

     8. OPTION EXERCISE PRICE AND CONSIDERATION.

          (a) The per Share exercise price for the Shares to be issued pursuant
to exercise of an Option shall be such price as is determined by the
Administrator and set forth in the Option Agreement, but shall be subject to the
following:

               (i) In the case of an Incentive Stock Option that is:

                    (A) granted to an Employee who at the time of grant is a Ten
Percent Holder, the per Share exercise price shall be no less than 110% of the
Fair Market Value per Share on the date of grant.

                    (B) granted to any other Employee, the per Share exercise
price shall be no less than 100% of the Fair Market Value per Share on the date
of grant.

               (ii) In the case of a Nonstatutory Stock Option that is:

                    (A) granted prior to the date, if any, on which the Common
Stock becomes a Listed Security to a person who at the time of grant is a Ten
Percent Holder, the per Share exercise price shall be no less than 110% of the
Fair Market Value per Share on the date of the grant if required by the
Applicable Laws and, if not so required, shall be such price as is determined by
the Administrator.

                    (B) granted prior to the date, if any, on which the Common
Stock becomes a Listed Security to any other eligible person, the per Share
exercise price shall be no less than 85% of the Fair Market Value per Share on
the date of grant if required by the Applicable Laws and, if not so required,
shall be such price as is determined by the Administrator.

                                      -7-

<PAGE>   8

                    (C) granted on or after the date, if any, on which the
Common Stock becomes a Listed Security to any eligible person, the per share
Exercise Price shall be such price as determined by the Administrator; provided,
however, that if such eligible person is, at the time of the grant of such
Option, a Named Executive of the Company, the per share Exercise Price shall be
no less than 100% of the Fair Market Value on the date of grant if such Option
is intended to qualify as performance-based compensation under Section 162(m) of
the Code.

               (iii) Notwithstanding the foregoing, Options may be granted with
a per Share exercise price other than as required above pursuant to a merger or
other corporate transaction.

          (b) The consideration to be paid for the Shares to be issued upon
exercise of an Option, including the method of payment, shall be determined by
the Administrator (and, in the case of an Incentive Stock Option, shall be
determined at the time of grant) and may consist entirely of (1) cash; (2)
check; (3) delivery of Optionee's promissory note with such recourse, interest,
security and redemption provisions as the Administrator determines to be
appropriate (subject to the provisions of Section 409 of the California General
Corporation Law); (4) cancellation of indebtedness; (5) other Shares that (x) in
the case of Shares acquired upon exercise of an Option, either have been owned
by the Optionee for more than six months on the date of surrender or such other
period as may be required to avoid a charge to the Company's earnings or were
not acquired, directly or indirectly, from the Company, and (y) have a Fair
Market Value on the date of surrender equal to the aggregate exercise price of
the Shares as to which such Option shall be exercised; (6) authorization for the
Company to retain from the total number of Shares as to which the Option is
exercised that number of Shares having a Fair Market Value on the date of
exercise equal to the exercise price for the total number of Shares as to which
the Option is exercised; (7) delivery of a properly executed exercise notice
together with such other documentation as the Administrator and the broker, if
applicable, shall require to effect exercise of the Option and prompt delivery
to the Company of the sale or loan proceeds required to pay the exercise price
and any applicable withholding taxes; (8) any combination of the foregoing
methods of payment; or (9) such other consideration and method of payment for
the issuance of Shares to the extent permitted under the Applicable Laws. In
making its determination as to the type of consideration to accept, the
Administrator shall consider if acceptance of such consideration may be
reasonably expected to benefit the Company, and the Administrator may refuse to
accept a particular form of consideration at the time of any Option exercise if,
in its sole discretion, acceptance of such form of consideration is not in the
best interests of the Company at such time.

     9. EXERCISE OF OPTION.

          (a) PROCEDURE FOR EXERCISE; RIGHTS AS A SHAREHOLDER. Any Option
granted hereunder shall be exercisable at such times and under such conditions
as determined by the Administrator, consistent with the term of the Plan and
reflected in the Option Agreement, including vesting requirements and/or
performance criteria with respect to the Company and/or the Optionee; provided
however, that, if required by the Applicable Laws, any Option granted prior to
the date, if any, upon which the Common Stock becomes a Listed Security shall
become

                                      -8-

<PAGE>   9

exercisable at the rate of at least 20% per year over five years from the date
the Option is granted. In the event that any of the Shares issued upon exercise
of an Option (which exercise occurs prior to the date, if any, upon which the
Common Stock becomes a Listed Security) should be subject to a right of
repurchase in the Company's favor, such repurchase right shall, if required by
the Applicable Laws, lapse at the rate of at least 20% per year over five years
from the date the Option is granted. Notwithstanding the above, in the case of
an Option granted to an officer, Director or Consultant of the Company or any
Parent, Subsidiary or Affiliate of the Company, the Option may become fully
exercisable, or a repurchase right, if any, in favor of the Company shall lapse,
at any time or during any period established by the Administrator. The
Administrator shall have the discretion to determine whether and to what extent
the vesting of Options shall be tolled during any leave of absence.

     An Option may not be exercised for a fraction of a Share.

     An Option shall be deemed exercised when written notice of such exercise
has been given to the Company in accordance with the terms of the Option by the
person entitled to exercise the Option and the Company has received full payment
for the Shares with respect to which the Option is exercised. Full payment may,
as authorized by the Administrator, consist of any consideration and method of
payment allowable under Section 8(b) of the Plan. Until the issuance (as
evidenced by the appropriate entry on the books of the Company or of a duly
authorized transfer agent of the Company) of the stock certificate evidencing
such Shares, no right to vote or receive dividends or any other rights as a
shareholder shall exist with respect to the Optioned Stock, not withstanding the
exercise of the Option. The Company shall issue (or cause to be issued) such
stock certificate promptly upon exercise of the Option. No adjustment will be
made for a dividend or other right for which the record date is prior to the
date the stock certificate is issued, except as provided in Section 13 of the
Plan.

     Exercise of an Option in any manner shall result in a decrease in the
number of Shares that thereafter may be available, both for purposes of the Plan
and for sale under the Option, by the number of Shares as to which the Option is
exercised.

          (b) TERMINATION OF EMPLOYMENT OR CONSULTING RELATIONSHIP. In the event
of termination of an Optionee's Continuous Service Status with the Company, such
Optionee may, but only within three months (or such other period of time, not
less than 30 days, as is determined by the Administrator, with such
determination in the case of an Incentive Stock Option being made at the time of
grant of the Option) after the date of such termination (but in no event later
than the expiration date of the term of such Option as set forth in the Option
Agreement), exercise his or her Option to the extent that the Optionee was
entitled to exercise it at the date of such termination. To the extent that the
Optionee was not entitled to exercise the Option at the date of such
termination, or if the Optionee does not exercise the Option to the extent so
entitled within the time specified above, the Option shall terminate and the
Optioned Stock underlying the unexercised portion of the Option shall revert to
the Plan. Unless otherwise determined by the Administrator, no termination shall
be deemed to occur and this Section 9(b) shall not apply if (i) the Optionee is
a Consultant who becomes an Employee, or (ii) the Optionee is an Employee who
becomes a Consultant.

                                      -9-

<PAGE>   10

          (c) DISABILITY OF OPTIONEE.

               (i) Notwithstanding Section 9(b) above, in the event of
termination of an Optionee's Continuous Service Status as a result of his or her
total and permanent disability (within the meaning of Section 22(e)(3) of the
Code), such Optionee may, but only within twelve months (or such other period of
time as is determined by the Administrator, with such determination in the case
of an Incentive Stock Option made at the time of grant of the Option) from the
date of such termination (but in no event later than the expiration date of the
term of such Option as set forth in the Option Agreement), exercise the Option
to the extent otherwise entitled to exercise it at the date of such termination.
To the extent that the Optionee was not entitled to exercise the Option at the
date of termination, or if the Optionee does not exercise such Option to the
extent so entitled within the time specified above, the Option shall terminate
and the Optioned Stock underlying the unexercised portion of the Option shall
revert to the Plan.

               (ii) In the event of termination of an Optionee's Continuous
Service Status as a result of a disability which does not fall within the
meaning of total and permanent disability (as set forth in Section 22(e)(3) of
the Code), such Optionee may, but only within twelve months (or such other
period of time as is determined by the Administrator, with such determination in
the case of an Incentive Stock Option made at the time of grant of the Option)
from the date of such termination (but in no event later than the expiration
date of the term of such Option as set forth in the Option Agreement), exercise
the Option to the extent otherwise entitled to exercise it at the date of such
termination. However, to the extent that such Optionee fails to exercise an
Option that is an Incentive Stock Option (within the meaning of Section 422 of
the Code) within three months of the date of such termination, the Option will
not qualify for Incentive Stock Option treatment under the Code. To the extent
that the Optionee was not entitled to exercise the Option at the date of
termination, or if the Optionee does not exercise such Option to the extent so
entitled within the time period specified above, the Option shall terminate and
the Optioned Stock underlying the unexercised portion of the Option shall revert
to the Plan.

          (d) DEATH OF OPTIONEE. In the event of the death of an Optionee during
the period of Continuous Service Status since the date of grant of the Option,
or within 30 days following termination of the Optionee's Continuous Service
Status, the Option may be exercised, at any time within twelve months following
the date of death (but in no event later than the expiration date of the term of
such Option as set forth in the Option Agreement), by such Optionee's estate or
by a person who acquired the right to exercise the Option by bequest or
inheritance, but only to the extent of the right to exercise that had accrued at
the date of death or, if earlier, the date of termination of the Optionee's
Continuous Service Status. To the extent that the Optionee was not entitled to
exercise the Option at the date of death or termination, as the case may be, or
if the Optionee does not exercise such Option to the extent so entitled within
the time specified above, the Option shall terminate and the Optioned Stock
underlying the unexercised portion of the Option shall revert to the Plan.

          (e) EXTENSION OF EXERCISE PERIOD. The Administrator shall have full
power and authority to extend the period of time for which an Option is to
remain exercisable following

                                      -10-

<PAGE>   11

termination of an Optionee's Continuous Status as an Employee or Consultant from
the periods set forth in Sections 9(b), 9(c) and 9(d) above or in the Option
Agreement to such greater time as the Board shall deem appropriate, provided,
that in no event shall such Option be exercisable later than the date of
expiration of the term of such Option as set forth in the Option Agreement.

          (f) BUY-OUT PROVISIONS. The Administrator may at any time offer to buy
out for a payment in cash or Shares an Option previously granted under the Plan
based on such terms and conditions as the Administrator shall establish and
communicate to the Optionee at the time such offer is made.

     10. STOCK PURCHASE RIGHTS.

          (a) RIGHTS TO PURCHASE. Stock Purchase Rights may be issued either
alone, in addition to, or in tandem with other awards granted under the Plan
and/or cash awards made outside of the Plan. After the Administrator determines
that it will offer Stock Purchase Rights under the Plan, it shall advise the
offeree in writing of the terms, conditions and restrictions related to the
offer, including the number of Shares that such person shall be entitled to
purchase, the price to be paid, and the time within which such person must
accept such offer, which shall in no event exceed 30 days from the date upon
which the Administrator made the determination to grant the Stock Purchase
Right. If required by the Applicable Laws, the purchase price of Shares subject
to Stock Purchase Rights shall not be less than 85% of the Fair Market Value of
the Shares as of the date of the offer, or, in the case of a person owning stock
representing more than 10% of the total combined voting power of all classes of
stock of the Company or any Parent or Subsidiary, the price shall not be less
than 100% of the Fair Market Value of the Shares as of the date of the offer. If
the Applicable Laws do not impose restrictions on the purchase price, the
purchase price of Shares subject to Stock Purchase Rights shall be as determined
by the Administrator. The offer to purchase Shares subject to Stock Purchase
Rights shall be accepted by execution of a Restricted Stock Purchase Agreement
in the form determined by the Administrator.

          (b) REPURCHASE OPTION. Unless the Administrator determines otherwise,
the Restricted Stock Purchase Agreement shall grant the Company a repurchase
option exercisable upon the voluntary or involuntary termination of the
purchaser's employment with the Company for any reason (including death or
disability). The purchase price for Shares repurchased pursuant to the
Restricted Stock Purchase Agreement shall be the original purchase price paid by
the purchaser and may be paid by cancellation of any indebtedness of the
purchaser to the Company. The repurchase option shall lapse at such rate as the
Administrator may determine; provided, however, that with respect to a purchaser
who is not an officer, Director or Consultant of the Company or of any Parent or
Subsidiary of the Company, it shall lapse at a minimum rate of 20% per year if
required by the Applicable Laws.

          (c) OTHER PROVISIONS. The Restricted Stock Purchase Agreement shall
contain such other terms, provisions and conditions not inconsistent with the
Plan as may be determined by the Administrator in its sole discretion. In
addition, the provisions of Restricted Stock Purchase Agreements need not be the
same with respect to each purchaser.

                                      -11-

<PAGE>   12

          (d) RIGHTS AS A SHAREHOLDER. Once the Stock Purchase Right is
exercised, the purchaser shall have the rights equivalent to those of a
shareholder, and shall be a shareholder when his or her purchase is entered upon
the records of the duly authorized transfer agent of the Company. No adjustment
will be made for a dividend or other right for which the record date is prior to
the date the Stock Purchase Right is exercised, except as provided in Section 13
of the Plan.

     11. TAXES.

          (a) As a condition of the exercise of an Option or Stock Purchase
Right granted under the Plan, the Participant (or in the case of the
Participant's death, the person exercising the Option) shall make such
arrangements as the Administrator may require for the satisfaction of any
applicable federal, state, local or foreign withholding tax obligations that may
arise in connection with the exercise of an Option or Stock Purchase Right and
the issuance of Shares. The Company shall not be required to issue any Shares
under the Plan until such obligations are satisfied.

          (b) In the case of an Employee and in the absence of any other
arrangement, the Employee shall be deemed to have directed the Company to
withhold or collect from his or her compensation an amount sufficient to satisfy
such tax obligations from the next payroll payment otherwise payable after the
date of an exercise of the Option.

          (c) This Section 11(c) shall apply only after the date, if any, upon
which the Common Stock becomes a Listed Security. In the case of a Participant
other than an Employee (or in the case of an Employee where the next payroll
payment is not sufficient to satisfy such tax obligations, with respect to any
remaining tax obligations), in the absence of any other arrangement and to the
extent permitted under the Applicable Laws, the Participant shall be deemed to
have elected to have the Company withhold from the Shares to be issued upon
exercise of the Option or Stock Purchase Right that number of Shares having a
Fair Market Value determined as of the applicable Tax Date (as defined below)
equal to the amount required to be withheld. For purposes of this Section 11,
the Fair Market Value of the Shares to be withheld shall be determined on the
date that the amount of tax to be withheld is to be determined under the
Applicable Laws (the "Tax Date").

          (d) If permitted by the Administrator, in its discretion, a
Participant may satisfy his or her tax withholding obligations upon exercise of
an Option or Stock Purchase Right by surrendering to the Company Shares that (i)
in the case of Shares previously acquired from the Company, have been owned by
the Participant for more than six months on the date of surrender, and (ii) have
a Fair Market Value determined as of the applicable Tax Date equal to the amount
required to be withheld.

          (e) Any election or deemed election by a Participant to have Shares
withheld to satisfy tax withholding obligations under Section 11(c) or (d) above
shall be irrevocable as to the particular Shares as to which the election is
made and shall be subject to the consent or disapproval of the Administrator.
Any election by a Participant under Section 11(d) above must be made on or prior
to the applicable Tax Date.

                                      -12-

<PAGE>   13

          (f) In the event an election to have Shares withheld is made by a
Participant and the Tax Date is deferred under Section 83 of the Code because no
election is filed under Section 83(b) of the Code, the Participant shall receive
the full number of Shares with respect to which the Option or Stock Purchase
Right is exercised but such Participant shall be unconditionally obligated to
tender back to the Company the proper number of Shares on the Tax Date.

     12. NON-TRANSFERABILITY OF OPTIONS AND STOCK PURCHASE RIGHTS. Options and
Stock Purchase Rights may not be sold, pledged, assigned, hypothecated,
transferred or disposed of in any manner other than by will or by the laws of
descent or distribution; provided however that, after the date, if any, upon
which the Common Stock becomes a Listed Security, the Administrator may in its
discretion grant transferable Nonstatutory Stock Options pursuant to Option
Agreements specifying (i) the manner in which such Nonstatutory Stock Options
are transferable and (ii) that any such transfer shall be subject to the
Applicable Laws. The designation of a beneficiary by an Optionee will not
constitute a transfer. An Option or Stock Purchase Right may be exercised,
during the lifetime of the holder of the Option or Stock Purchase Right, only by
such holder or a transferee permitted by this Section 12.

     13. ADJUSTMENTS UPON CHANGES IN CAPITALIZATION, CORPORATE TRANSACTIONS AND
CERTAIN OTHER TRANSACTIONS.

          (a) CHANGES IN CAPITALIZATION. Subject to any required action by the
shareholders of the Company, the number of shares of Common Stock covered by
each outstanding Option or Stock Purchase Right, and the number of shares of
Common Stock that have been authorized for issuance under the Plan but as to
which no Options or Stock Purchase Rights have yet been granted or that have
been returned to the Plan upon cancellation or expiration of an Option or Stock
Purchase Right, as well as the price per Share of Common Stock covered by each
such outstanding Option or Stock Purchase Right, shall be proportionately
adjusted for any increase or decrease in the number of issued Shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination, recapitalization or reclassification of the Common Stock (including
any change in the number of Shares of Common Stock effected in connection with a
change of domicile of the Company), or any other increase or decrease in the
number of issued shares of Common Stock effected without receipt of
consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration." Such adjustment shall be made by the
Administrator, whose determination in that respect shall be final, binding and
conclusive. Except as expressly provided herein, no issuance by the Company of
shares of stock of any class, or securities convertible into shares of stock of
any class, shall affect, and no adjustment by reason thereof shall be made with
respect to, the number or price of Shares of Common Stock subject to an Option
or Stock Purchase Right.

          (b) DISSOLUTION OR LIQUIDATION. In the event of the dissolution or
liquidation of the Company, each outstanding Option or Stock Purchase Right
shall terminate immediately prior to the consummation of such action, unless
otherwise provided by the Administrator.

                                      -13-

<PAGE>   14

          (c) CORPORATE TRANSACTIONS. In the event of a Corporate Transaction,
each outstanding Option and Stock Purchase Right shall be assumed or an
equivalent option or right shall be substituted by the successor corporation or
a Parent or Subsidiary of such successor corporation, unless such successor
corporation does not agree to assume the outstanding Options or Stock Purchase
Rights or to substitute equivalent options or rights, in which case such Options
or Stock Purchase Rights shall terminate upon the consummation of the
transaction.

          For purposes of this Section 13(c), an Option or a Stock Purchase
Right shall be considered assumed, without limitation, if, at the time of
issuance of the stock or other consideration upon a Corporate Transaction, each
holder of an Option or Stock Purchase Right would be entitled to receive upon
exercise of the Option or Stock Purchase Right the same number and kind of
shares of stock or the same amount of property, cash or securities as such
holder would have been entitled to receive upon the occurrence of the
transaction if the holder had been, immediately prior to such transaction, the
holder of the number of Shares of Common Stock covered by the Option or the
Stock Purchase Right at such time (after giving effect to any adjustments in the
number of Shares covered by the Option or Stock Purchase Right as provided for
in this Section 13); provided however that if such consideration received in the
transaction is not solely common stock of the successor corporation or its
Parent, the Administrator may, with the consent of the successor corporation,
provide for the consideration to be received upon exercise of the Option or
Stock Purchase Right to be solely common stock of the successor corporation or
its Parent equal to the Fair Market Value of the per Share consideration
received by holders of Common Stock in the transaction.

          (d) CERTAIN DISTRIBUTIONS. In the event of any distribution to the
Company's shareholders of securities of any other entity or other assets (other
than dividends payable in cash or stock of the Company) without receipt of
consideration by the Company, the Administrator may, in its discretion,
appropriately adjust the price per Share of Common Stock covered by each
outstanding Option or Stock Purchase Right to reflect the effect of such
distribution.

     14. TIME OF GRANTING OPTIONS AND STOCK PURCHASE RIGHTS. The date of grant
of an Option or Stock Purchase Right shall, for all purposes, be the date on
which the Administrator makes the determination granting such Option or Stock
Purchase Right, or such other date as is determined by the Administrator;
provided, however, that in the case of any Incentive Stock Option, the grant
date shall be the later of the date on which the Administrator makes the
determination granting such Incentive Stock Option or the date of commencement
of the Optionee's employment relationship with the Company. Notice of the
determination shall be given to each Employee or Consultant to whom an Option or
Stock Purchase Right is so granted within a reasonable time after the date of
such grant.

     15. AMENDMENT AND TERMINATION OF THE PLAN.

          (a) AUTHORITY TO AMEND OR TERMINATE. The Board may at any time amend,
alter, suspend, discontinue or terminate the Plan, but no amendment, alteration,
suspension, discontinuation or termination (other than an adjustment made
pursuant to Section 13 above) shall be made that would materially and adversely
affect the rights of any Optionee or holder of

                                      -14-

<PAGE>   15

Stock Purchase Rights under any outstanding grant, without his or her consent.
In addition, to the extent necessary and desirable to comply with the Applicable
Laws, the Company shall obtain shareholder approval of any Plan amendment in
such a manner and to such a degree as required.

          (b) EFFECT OF AMENDMENT OR TERMINATION. No amendment or termination of
the Plan shall materially and adversely affect Options already granted, unless
mutually agreed otherwise between the Optionee and the Administrator, which
agreement must be in writing and signed by the Optionee and the Company.

     16. CONDITIONS UPON ISSUANCE OF SHARES. Notwithstanding any other provision
of the Plan or any agreement entered into by the Company pursuant to the Plan,
the Company shall not be obligated, and shall have no liability for, failure to
issue or deliver any Shares under the Plan unless such issuance or delivery
would comply with the Applicable Laws, with such compliance determined by the
Company in consultation with its legal counsel.

     As a condition to the exercise of an Option or Stock Purchase Right, the
Company may require the person exercising such Option or Stock Purchase Right to
represent and warrant at the time of any such exercise that the Shares are being
purchased only for investment and without any present intention to sell or
distribute such Shares if, in the opinion of counsel for the Company, such a
representation is required by law.

     17. RESERVATION OF SHARES. The Company, during the term of this Plan, will
at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

     18. AGREEMENTS. Options and Stock Purchase Rights shall be evidenced by
Option Agreements and Restricted Stock Purchase Agreements, respectively, in
such form(s) as the Administrator shall from time to time approve.

     19. SHAREHOLDER APPROVAL. If required by the Applicable Laws, continuance
of the Plan shall be subject to approval by the shareholders of the Company
within twelve months before or after the date the Plan is adopted. Such
shareholder approval shall be obtained in the degree and manner required under
the Applicable Laws.

     20. INFORMATION AND DOCUMENTS TO OPTIONEES AND PURCHASERS. Prior to the
date, if any, upon which the Common Stock becomes a Listed Security and if
required by the Applicable Laws, the Company shall provide financial statements
at least annually to each Optionee and to each individual who acquired Shares
pursuant to the Plan, during the period such Optionee or purchaser has one or
more Options or Stock Purchase Rights outstanding, and in the case of an
individual who acquired Shares pursuant to the Plan, during the period such
individual owns such Shares. The Company shall not be required to provide such
information if the issuance of Options or Stock Purchase Rights under the Plan
is limited to key employees whose duties in connection with the Company assure
their access to equivalent information. In addition, at the time of issuance of
any securities under the Plan, the Company shall provide to the Optionee or the
purchaser a copy of the Plan and any agreement(s) pursuant to which securities
granted under the Plan are issued.

                                      -15-

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