Document:

<PAGE>

                                                               Exhibit 10.3

Portions of this Exhibit have been omitted pursuant to a confidential treatment
request filed with the Securities and Exchange Commission. An asterisk (*)
identifies where such confidential treatment has been requested and information
has been omitted. The omitted portions have been filed separately with the
Securities and Exchange Commission.

                               AMENDMENT NO. 1 TO
                          YAHOO! INC. AND WEBHIRE, INC.
                               SERVICES AGREEMENT

     This Amendment No. 1 to the Yahoo! Inc. and Webhire, Inc. Services
Agreement (the "Amendment") is entered into as of July 27, 1999 (the "Amendment
Date") between Yahoo! Inc., a Delaware corporation with offices at 3420 Central
Expressway, Santa Clara, CA 95051 ("Yahoo") and Webhire, Inc., a Delaware
corporation with offices at 91 Hartwell Avenue, Lexington, MA 02421 ("Webhire")
and amends the Yahoo! Inc. and Webhire, Inc. Services Agreement entered into
between Yahoo and Webhire dated June 3, 1999 (the "Agreement").

     For good and valuable consideration, the receipt of which is hereby
acknowledged, Yahoo and Webhire hereby agree to amend the Agreement as follows:

1.   NEW EQUITY. On the date of closing of a financing in which SOFTBANK Capital
     Partners LP and/or its affiliates purchase twenty million dollars
     ($20,000,000) of Webhire's Common Stock, at least one million five hundred
     thousand dollars ($1,500,000) of which is purchased by Yahoo (the "Softbank
     Financing"), Webhire shall issue to Yahoo a Warrant to purchase eighty-four
     thousand five hundred fifty nine (84,559) shares of Webhire's Common Stock
     at a per share purchase price of $4.95 (the "New Warrant"). The New Warrant
     shall be issued in the form of EXHIBIT A to this Amendment. The New Warrant
     will be issued in addition to the Warrant to purchase one hundred
     fourteen thousand six hundred fifty nine (114,659) shares of Webhire's
     Common Stock issued to Yahoo pursuant to Section 8.1 of the Agreement. If
     the Softbank Financing is not closed on or before October 29, 1999,
     Webhire's obligation to issue a warrant under this section will terminate
     and be without force or effect.

2.   ADVERTISING ON YAHOO. Webhire will pay Yahoo a non-refundable,
     non-creditable slotting fee (the "Slotting Fee") equal to two million
     dollars ($2,000,000) in exchange for advertising and promotion appearing on
     Yahoo Properties (the "Webhire Advertising") during the time period
     beginning on the Amendment Date and ending on the date the Slotting Fee is
     exhausted pursuant to this Section 2 (the "Advertising Term"). The
     placement of the Webhire Advertising will be mutually agreed upon by the
     parties and, in all cases, subject to inventory availability. The Slotting
     Fee will be payable as follows: (i) one million dollars ($1,000,000) within
     ten (10) days after the date of the closing of the Softbank Financing (the
     "Softbank Closing Date"), (ii) five hundred thousand dollars ($500,000) no
     later than

<PAGE>

     December 31, 1999 and (iii) five hundred thousand dollars ($500,000) no
     later than March 31, 2000. The first payment of the Slotting Fee will be
     credited for any amounts already paid by Webhire to Yahoo for Webhire
     Advertising appearing during the Advertising Term. The parties agree that
     three hundred thousand dollars ($300,000) of the Slotting Fee shall be
     designated as a setup, design and implementation (the "Setup Fee"). The
     parties further agree that they shall use commercially reasonable efforts
     to commence the advertising program during the third calendar quarter of
     1999, and to schedule the remaining advertising and promotion evenly across
     each of the subsequent four (4) quarters. Webhire Advertising shall be
     credited against the full $2 million Slotting Fee (regardless of the amount
     designated for the Setup Fee) at a rate that is no more than **********
     ************ of the price on Yahoo's then current rate card after giving
     effect to, to the extent they exist, Yahoo standard volume and/or early
     payment discounts (the "Webhire Advertising Price"). The Webhire
     Advertising will be subject to the Standard Terms and Conditions for Yahoo!
     Advertising set forth in EXHIBIT B to this Amendment. If the Softbank
     Financing is not completed on or before October 29, 1999, then (a) Webhire
     shall not be required to pay Yahoo the Slotting Fee, (b) Yahoo shall not be
     required to place any advertising and promotion for Webhire on the Yahoo
     Properties pursuant to this Section and (c) Yahoo will still be entitled to
     payment from Webhire at the Webhire Advertising Price for any Webhire
     Advertising that appeared before October 29, 1999 but for which Yahoo has
     not yet been paid. In the event of termination of the Agreement by Webhire
     pursuant to Section 9.2, Webhire's obligation to pay any portion of the
     Slotting Fee due after the date of such termination shall cease and Webhire
     shall be entitled to receive only the amount of Webhire Advertising which
     could be obtained at the Webhire Advertising Price for the portion of the
     Slotting Fee already paid.

3.   RIGHT OF OFFER. Yahoo will **************************** in the event that
     Yahoo, at its sole discretion, elects to create a preferred listing
     program primarily related to employment or recruiting on a site solely
     owned, created and branded by Yahoo (a "Program"). Yahoo shall
     ************************************************************************
     ***************************************. If Webhire declines to commence
     good faith negotiations with Yahoo within ten (10) days after receiving
     such written notice from Yahoo, or if the parties fail to reach
     agreement within ten (10) days following the commencement of good faith
     negotiations (or such later date as is agreed by the parties), Yahoo
     shall ************************************************
     ***************************************************. Advertising and
     promotional opportunities that are in the normal course of Yahoo's
     business including, but not limited to, banner ads on category pages and
     keyword search results pages and branded listings shall not be
     considered a new preferred listing program for the purposes of this
     Section 3.

4.   ADVERTISING SALES. On a date mutually agreed upon after the Amendment Date,
     Yahoo and Webhire will meet to consider options that would allow Webhire to
     sell advertising on Yahoo Properties on behalf of Yahoo to recruiters on an
     agency

                                       2
<PAGE>

     basis. This section shall not create any obligation on either party to
     enter into such an agency relationship.

5.   YAHOO PREMIUM SERVICES. On a date mutually agreed upon by the parties
     following the Amendment Date, Yahoo and Webhire will meet and use
     reasonable efforts to agree upon the specifications for the Yahoo Premium
     Services. The Yahoo Premium Services will be launched on a date mutually
     agreed upon after the launch of Yahoo Recruiter.

6.   OTHER. Except as expressly amended as set forth herein, the Agreement shall
     remain in full force and effect in accordance with its terms. Capitalized
     terms not otherwise defined in this Amendment shall have the same meaning
     as in the Agreement. The section headings appearing in this Amendment are
     inserted only as a matter of convenience and in no way define, limit,
     construe or describe the scope or extent of such section or in any way
     affect such section.

     This Amendment has been executed by the duly authorized representatives of
the parties, effective as of the Amendment Date.

<TABLE>
<S>                                                  <C>

YAHOO! INC.                                          WEBHIRE, INC.

By:      /s/ Ellen Siminoff                          By:      /s/ Martin J. Fahey
         -----------------------------                      ----------------------------

Name:    Ellen Siminoff                              Name:  Martin J. Fahey
         -----------------------------                      ----------------------------

Title:   V.P. - Business Development                 Title: President
         -----------------------------                      ----------------------------

</TABLE>

                                       3
<PAGE>

                                    EXHIBIT A

                                 FORM OF WARRANT

NEITHER THIS WARRANT NOR THE SHARES OF STOCK ISSUABLE UPON EXERCISE HEREOF HAVE
BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED. NO SALE, TRANSFER
OR OTHER DISPOSITION OF THIS WARRANT OR SAID SHARES MAY BE EFFECTED WITHOUT (i)
AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO, (ii) AN OPINION OF COUNSEL
FOR THE HOLDER IN FORM REASONABLY ACCEPTABLE TO THE COMPANY'S COUNSEL THAT SUCH
REGISTRATION IS NOT REQUIRED OR (iii) RECEIPT OF A NO ACTION LETTER FROM THE
SECURITIES AND EXCHANGE COMMISSION TO THE EFFECT THAT REGISTRATION UNDER THE ACT
IS NOT REQUIRED.

Number of Shares Issuable Upon Exercise: 84,559 Shares of Common Stock

                   WARRANT TO PURCHASE SHARES OF COMMON STOCK

                              Expires: June 3, 2004

THIS CERTIFIES THAT, for value received, Yahoo! Inc., a California corporation,
is entitled to subscribe for and purchase 84,559 shares (as adjusted pursuant to
the provisions hereof, the "Shares") of the Common Stock of Webhire, Inc., a
Delaware corporation (the "Company"), at a price per share of $4.95 (as adjusted
pursuant to the provisions hereof, the "Exercise Price"), subject to the
provisions and upon the terms and conditions hereinafter set forth in this
warrant ("Warrant"). As used herein, the term "Common Stock" shall mean the
Company's presently authorized Common Stock, $.01 par value per share, and any
stock into or for which such Common Stock may hereafter be converted or
exchanged.

This Warrant is issued pursuant to the Services Agreement by and among the
Company and Yahoo! Inc., dated as of June 3, 1999, as amended on July 28, 1999
(the "Agreement"). Capitalized terms not otherwise defined in this Warrant shall
have the same meaning as in the Agreement.

1. TERM. This Warrant shall become exercisable, in whole or in part, at any time
and from time to time from and after June 3, 2000 (the "Vesting Date"), provided
that the Agreement is in effect on the Vesting Date. Notwithstanding the
foregoing, the exercisability of this Warrant shall be accelerated, and this
Warrant shall become exercisable, in whole or in part, upon the earliest to
occur, prior to the Vesting Date, of (i) the termination of the Agreement by the
Company at the Company's election, other than a rightful termination of the
Agreement by the Company due to an uncured breach of the Agreement by Yahoo!
Inc. or the holder of this Warrant, pursuant to Section 9.2 of the Agreement,
(ii) the rightful termination of the Agreement by the holder of this Warrant due
to an uncured breach of the Agreement by the Company pursuant to Sections 9.2
and 9.3 of the Agreement, (iii) a Warrant Expiration Sale Event (as defined in
Section 4(a) hereof), or (iv) the date upon which the Company determines in its
sole discretion that this Warrant shall become fully exercisable, as
communicated in writing to the holder of this Warrant. This Warrant shall expire
and no longer be exercisable at 5:00 p.m. Eastern Standard Time on June 3, 2004;
provided, however, that this Warrant shall sooner expire (a) upon the
termination of the Agreement prior to the Vesting Date (other than a termination
described in subsections (i) and (ii) of this Section 1), (b) on October 29,
1999 in the event the Softbank Financing is not completed on or before that date
or (c) upon the occurrence of a Warrant Expiration Sale Event.

                                       4
<PAGE>

2. METHOD OF EXERCISE; NET ISSUE EXERCISE.

(a) METHOD OF EXERCISE; PAYMENT; ISSUANCE OF NEW WARRANT. Subject to the
provisions of Section 1 hereof, this Warrant may be exercised by the holder
hereof, in whole or in part and from time to time, by the surrender of this
Warrant (with the Notice of Exercise form attached hereto as EXHIBIT A duly
executed) at the principal office of the Company and the payment to the Company,
by cash, bank check payable to the order of the Company or wire transfer of
immediately available funds to the account of the Company, of an amount equal to
the Exercise Price per share multiplied by the number of Shares then being
purchased. The person or persons in whose name(s) any certificates representing
Shares shall be issuable upon exercise of this Warrant shall be deemed to have
become the holder(s) of record of, and shall be treated for all purposes as the
record holder(s) of, the Shares represented thereby (and such Shares shall be
deemed to have been issued) immediately prior to the close of business on the
date or dates upon which this Warrant is exercised. In the event of any exercise
of this Warrant, certificates for the Shares so purchased shall be delivered to
the holder hereof as soon as possible and in any event within thirty (30) days
of receipt of such notice and, unless this Warrant has been fully exercised or
expired, a new Warrant representing the portion of the Shares, if any, with
respect to which this Warrant shall not then have been exercised shall also be
issued to the holder hereof as soon as possible thereafter.

(b) RIGHT TO CONVERT WARRANT INTO STOCK; NET ISSUANCE.

(i) In addition to and without limiting the rights of the holder under the terms
of this Warrant, the holder may elect to convert this Warrant or any portion
thereof (the "Conversion Right") into shares of Common Stock, the aggregate
value of which shares shall be equal to the value of this Warrant or the portion
thereof being converted. The Conversion Right may be exercised by the holder by
surrender of this Warrant at the principal office of the Company together with
notice of the holder's intention to exercise the Conversion Right, in which
event the Company shall issue to the holder a number of shares of the Company's
Common Stock computed using the following formula:

          X= Y(A-B)
             --------
                 A
Where:

          X    The number of shares of Common Stock to be issued to the holder.

          Y    The number of shares of Common Stock representing the portion of
               this Warrant that is being converted.

          A    The fair market value of one share of the Company's Common Stock.

          B    The Exercise Price (as adjusted to the date of such
               calculations).

(ii) For purposes of this Section 2(b), the "fair market value" per share of the
Company's Common Stock shall mean, the average daily Market Price (as defined
below) during the period of the most recent 20 days, ending on the last business
day before the effective date of exercise of the Conversion Right, on which the
national securities exchanges were open for trading, except that if no class of
the Common Stock is then listed or admitted to trading on any national
securities exchange or quoted in the over-counter market, the fair market value
shall be the Market Price on the last business day before the effective date of
exercise of the Conversion Right. If the Common Stock is traded on a national
securities exchange or admitted to unlisted trading privileges on such an
exchange, or is listed on the National Market System (the "National Market
System") of the National Association of Securities Dealers Automated Quotations
System (the "NASDAQ"), the Market Price as of a specified day shall be the last
reported sale price of the Common Stock on such exchange or on the National
Market System on such date or if no such sale is made on such day, the mean of
the closing bid and asked prices for such day on such exchange or on the
National Market System. If the Common Stock is not so listed or admitted to
unlisted trading privileges, the Market Price as of a specified day shall be the
mean of the last bid and asked prices reported on such date (x) by the NASDAQ or
(y) if

                                       5
<PAGE>

reports are unavailable under clause (x) above by the National Quotation Bureau
Incorporated. If the Common Stock is not so listed or admitted to unlisted
trading privileges and bid and ask prices are not reported, the Market Price as
of a specified day shall be determined in good faith by written resolution of
the Board of Directors of the Company.

(c) AUTOMATIC CONVERSION. In the event of termination of this Warrant pursuant
to Section 1 above, to the extent that this Warrant is then exercisable and such
conversion would result in the issuance of shares to the holder, this Warrant
shall be deemed automatically converted under Section 2(b) above immediately
prior to the time at which it would otherwise expire.

3. STOCK FULLY PAID; RESERVATION OF SHARES. All Shares that may be issued upon
the exercise of this Warrant shall, upon issuance, be validly issued, fully paid
and nonassessable, and free from all taxes, liens and charges with respect to
the issue thereof. During the period within which this Warrant may be exercised,
the Company will at all times have duly authorized and reserved, for the purpose
of issuance upon exercise of this Warrant, a sufficient number of shares of
Common Stock.

4. ADJUSTMENTS TO NUMBER OF SHARES AND EXERCISE PRICE. The number and kind of
securities purchasable upon the exercise of this Warrant and the Exercise Price
shall be subject to adjustment from time to time as set forth below upon the
occurrence of certain events described herein.

(a) RECLASSIFICATION OR MERGER. In case of any reclassification, change or
conversion of securities of the class issuable upon exercise of this Warrant
(other than a change in par value, or from par value to no par value, or from no
par value to par value, or as a result of a subdivision or combination), or in
case of any merger of the Company with or into another corporation or entity
(other than a merger with another corporation in which the Company is a
continuing corporation and which does not result in any reclassification or
change of outstanding securities issuable upon exercise of this Warrant), or in
the case of any sale of all or substantially all of the assets of the Company
(each, a "Sale Event"), the Company, or such successor or purchasing corporation
or entity, as the case may be, shall issue and execute a new Warrant providing
that the holder of this Warrant shall have the same rights to exercise such new
Warrant as the holder has with respect to this Warrant and upon such exercise to
receive, in lieu of each share of Common Stock theretofore issuable upon
exercise of this Warrant, the kind and amount of shares of stock, other
securities, money and property receivable upon such reclassification, change or
merger by a holder of one share of Common Stock of the Company. Such new Warrant
shall provide for adjustments that shall be as nearly equivalent as may be
practicable to the adjustments provided for in this Section 4. The provisions of
this Section 4(a) shall similarly apply to successive reclassifications,
changes, mergers and transfers. Notwithstanding anything to the contrary in this
Section 4(a), if a Sale Event will result in the holders of the Company's Common
Stock receiving only cash, property and/or securities which are not listed on a
national securities exchange or the National Market System (a "Warrant
Expiration Sale Event"), the Warrant shall expire and no longer be exercisable
as of the date of the closing of such Warrant Expiration Sale Event and no new
Warrant shall be issued.

(b) SUBDIVISION OR COMBINATION OF SHARES. If the Company at any time while this
Warrant remains outstanding and unexpired shall subdivide or combine its Common
Stock, the Exercise Price and the number of Shares issuable upon exercise hereof
shall be proportionately adjusted.

(c) STOCK DIVIDENDS. If the Company at any time while this Warrant is
outstanding and unexpired shall pay a dividend payable in shares of Common
Stock, then the Exercise Price shall be adjusted, from and after the date of
determination of shareholders entitled to receive such dividend or distribution
(the "Record Date"), to that price determined by multiplying the Exercise Price
in effect immediately prior to the Record Date by a fraction (i) the numerator
of which shall be the total number of shares of Common Stock outstanding
immediately prior to such dividend or distribution, and (ii) the denominator of
which shall be the total number of shares of Common Stock outstanding
immediately after such dividend or distribution, and the number of Shares
subject to this Warrant shall be adjusted, from and after the Record Date, to
that number determined by multiplying the number of shares of Common Stock for
which this Warrant may be exercised immediately prior to the Record Date by a
fraction (x) the numerator of which shall be the Exercise Price

                                       6
<PAGE>

immediately prior to the Record Date, and (y) the denominator of which shall be
the Exercise Price on and immediately after the Record Date, as adjusted in
accordance with the provisions of this Section 4(c).

(d) NOTICE OF ADJUSTMENTS. Whenever the Exercise Price shall be adjusted
pursuant to the provisions hereof, the Company shall within thirty (30) days of
such adjustment deliver a certificate signed by its chief financial officer to
the registered holder(s) hereof setting forth, in reasonable detail, the event
requiring the adjustment, the amount of the adjustment, the method by which such
adjustment was calculated, and the Exercise Price after giving effect to such
adjustment.

5. NO IMPAIRMENT. The Company will not, by amendment of its Third Amended and
Restated Certificate of Incorporation (as may be further amended and/or restated
from time to time) or through any reorganization, recapitalization, transfer of
assets, consolidation, merger, dissolution, issuance or sale of securities or
any other voluntary action, avoid or seek to avoid the observance or performance
of any of the terms to be observed or performed hereunder by the Company, but
will at all times in good faith assist in the carrying out of all the provisions
of this Warrant and in the taking of all such action as may be necessary or
appropriate in order to protect the rights of the holder of this Warrant against
impairment.

6. FRACTIONAL SHARES. No fractional shares of Common Stock will be issued in
connection with any exercise hereunder, but in lieu of such fractional shares
the Company shall make a cash payment therefor based upon the per share fair
market value of the Common Stock on the date of exercise.

7. COMPLIANCE WITH SECURITIES ACT; DISPOSITION OF WARRANT OR SHARES OF COMMON
STOCK.

(a) COMPLIANCE WITH SECURITIES ACT. The holder of this Warrant, by acceptance
hereof, agrees that this Warrant and the Shares to be issued upon exercise
hereof are being acquired for investment and that such holder will not offer,
sell or otherwise dispose of this Warrant or any Shares to be issued upon
exercise hereof except under circumstances which will not result in a violation
of the Securities Act of 1933, as amended (the "Securities Act"). This Warrant
and all Shares issued upon exercise of this Warrant (unless registered under the
Securities Act) shall be stamped or imprinted with a legend in substantially the
following form:

THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED. NO SALE, TRANSFER OR OTHER DISPOSITION MAY BE EFFECTED WITHOUT (i) AN
EFFECTIVE REGISTRATION STATEMENT RELATED THERETO, (ii) AN OPINION OF COUNSEL FOR
THE HOLDER IN A FORM REASONABLY ACCEPTABLE TO THE COMPANY'S COUNSEL THAT SUCH
REGISTRATION IS NOT REQUIRED OR (iii) RECEIPT OF A NO-ACTION LETTER FROM THE
SECURITIES AND EXCHANGE COMMISSION TO THE EFFECT THAT REGISTRATION UNDER THE ACT
IS NOT REQUIRED.

(b) DISPOSITION OF WARRANT AND SHARES. With respect to any offer, sale or other
disposition of this Warrant or any Shares acquired pursuant to the exercise of
this Warrant prior to registration thereof, the holder hereof and each
subsequent holder of this Warrant agrees to give written notice to the Company
prior thereto, describing briefly the manner thereof, together with a written
opinion of such holder's counsel in form acceptable to the Company's counsel, if
reasonably requested by the Company, to the effect that such offer, sale or
other disposition may be effected without registration or qualification (under
the Securities Act then in effect or any federal or state law then in effect) of
this Warrant or such Shares and indicating whether or not under the Securities
Act certificates for this Warrant or such Shares to be sold or otherwise
disposed of require any restrictive legend as to applicable restrictions on
transferability in order to insure compliance with the Securities Act. Each
certificate representing this Warrant or the Shares thus transferred (except a
transfer pursuant to Rule 144 under the Securities Act) shall bear a legend as
to the applicable restrictions on transferability in order to insure compliance
with the Securities Act unless, in the aforesaid opinion of counsel for the
holder, such legend is not required in order to insure compliance with the
Securities Act. The Company may issue stop transfer instructions to its transfer
agent in connection with the foregoing restrictions.

8. NOTICE OF CERTAIN EVENTS. The Company shall provide the holder of this
Warrant with at least thirty (30) days notice (or such greater amount of notice
as Delaware law requires to be given to shareholders having the

                                       7
<PAGE>

right to vote at a meeting on any Sale Event) prior to (i) any Sale Event, (ii)
any liquidation, dissolution or winding up of the Company or (iii) the record
date for any cash dividend declared on the Company's Common Stock.

9. REPRESENTATIONS AND WARRANTIES. This Warrant is issued and delivered on the
basis of the following:

(a) This Warrant has been duly authorized, executed and delivered by the Company
and constitutes the valid and binding obligation of the Company, enforceable in
accordance with its terms;

(b) The Shares have been duly authorized and reserved for issuance by the
Company and, when issued in accordance with the terms hereof, will be validly
issued, fully paid and nonassessable;

(c) The rights, preferences, privileges and restrictions granted to or imposed
upon the Shares and the holders thereof are as set forth in the Company's Third
Amended and Restated Certificate of Incorporation, a true and complete copy of
which has been delivered to the original holder of this Warrant.

10. MODIFICATION AND WAIVER. This Warrant and any provision hereof may be
changed, waived, discharged or terminated only by an instrument in writing
signed by the party against which enforcement of the same is sought.

11. NOTICES. Any notice, request or other document required or permitted to be
given or delivered to the holder hereof or the Company shall be in writing and
shall delivered or sent to each such holder at its address as shown on the books
of the Company or to the Company at its principal executive office and shall be
deemed received (i) if personally delivered or sent by electronic facsimile
transmission, upon actual receipt, or (ii) if sent by reputable overnight
courier service, twenty-four hours after deposit with such courier service, or
(iii) if sent by certified mail (postage prepaid), return receipt requested,
forty-eight hours after deposit in the mail.

12. BINDING EFFECT ON SUCCESSORS; NON-ASSIGNABILITY. Except as provided in
Section 4(a) above, this Warrant shall be binding upon any corporation
succeeding the Company by merger, consolidation or acquisition of all or
substantially all of the Company's assets. This Warrant may not be transferred
or assigned (by operation of law or otherwise) by the holder without the prior
written consent of the Company, except to a successor-in-interest of all or
substantially all of the holder's assets or to an affiliate of the holder formed
solely for the purpose of holding securities and other investments.

13. LOST WARRANTS OR STOCK CERTIFICATES. The Company covenants to the holder
hereof that upon receipt of evidence reasonable satisfactory to the Company of
the loss, theft, destruction, or mutilation of this Warrant or any stock
certificate issued upon exercise hereof and, in the case of any such loss, theft
or destruction, upon receipt of an indemnity reasonably satisfactory to the
Company, or in the case of any such mutilation upon surrender and cancellation
of such Warrant or stock certificate, the Company shall make and deliver a new
Warrant or stock certificate, or like tenor, in lieu of the lost, stolen,
destroyed or mutilated Warrant or stock certificate.

14. DESCRIPTIVE HEADINGS. The descriptive headings of the several paragraphs of
this Warrant are inserted for convenience only and do not constitute a part of
this Warrant.

15. EQUITABLE RELIEF. Because legal remedies may be inadequate to enforce the
provisions of this Warrant, equitable relief, including specific performance and
injunctive relief, may be used to enforce the provisions hereof.

16. SAVINGS CLAUSE. If any provisions of this Warrant shall be determined to be
illegal or unenforceable, such determination shall in no manner affect the
legality or enforceability of any other provision hereof.

17. GOVERNING LAW. This Warrant shall be construed and enforced in accordance
with, and the rights of the parties shall be governed by, the laws of the State
of Delaware, without giving effect to its conflicts of laws provisions.

                                       8
<PAGE>

IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by its
officer thereunto duly authorized.

Date: ________________, 1999

WEBHIRE, INC.

By:
Name:
Title:

                                       9
<PAGE>

                                    EXHIBIT B

              STANDARD TERMS AND CONDITIONS FOR YAHOO! ADVERTISING

The following terms and conditions (the "Standard Terms") shall be deemed to be
incorporated into the attached insertion order (the "Insertion Order"):

1. TERMS OF PAYMENT. Advertiser must submit completed credit application to
determine terms of payment. If no credit application is submitted or the request
for credit is denied by Yahoo! Inc. ("Yahoo") in its sole discretion, the
Insertion Order must be paid in advance of the advertisement start date. Major
credit cards (VISA, M/C and American Express) are accepted. If Yahoo approves
credit, Advertiser will be invoiced on the first day of the contract period set
forth on the Insertion Order and payment shall be made to Yahoo within thirty
(30) days from the date of invoice ("Due Date"). Amounts paid after the Due Date
shall bear interest at the rate of one percent (1%) per month (or the highest
rate permitted by law, if less). In the event Advertiser fails to make timely
payment, Advertiser will be responsible for all reasonable expenses (including
attorneys' fees) incurred by Yahoo in collecting such amounts. Yahoo reserves
the right to suspend performance of its obligations hereunder (or under any
other agreement with Advertiser) in the event Advertiser fails to make timely
payment hereunder or under any other agreement with Yahoo.

2. POSITIONING. Except as otherwise expressly provided in the Insertion Order,
positioning of advertisements within the Yahoo properties or on any page is at
the sole discretion of Yahoo. Yahoo may, at its sole discretion, remove from the
insertion order (and substitute with similar inventory) any keyword or category
page that it believes to be a trademark, trade name, company name, product name
or brand name belonging to or claimed by a third party.

3. USAGE STATISTICS. Unless specified in the Insertion Order, Yahoo makes no
guarantees with respect to usage statistics or levels of impressions for any
advertisement. Advertiser acknowledges that delivery statistics provided by
Yahoo are the official, definitive measurements of Yahoo's performance on any
delivery obligations provided in the Insertion Order. The processes and
technology used to generate such statistics have been certified and audited by
an independent agency. No other measurements or usage statistics (including
those of Advertiser or a third party ad server) shall be accepted by Yahoo or
have bearing on the Insertion Order.

4. RENEWAL. Except as expressly set forth in the Insertion Order, any renewal of
the Insertion Order and acceptance of any additional advertising order shall be
at Yahoo's sole discretion. Pricing for any renewal period is subject to change
by Yahoo from time to time.

5. NO ASSIGNMENT OR RESALE OF AD SPACE. Advertiser may not resell, assign or
transfer any of its rights hereunder, and any attempt to resell, assign or
transfer such rights shall result in immediate termination of this contract,
without liability to Yahoo.

6. LIMITATION OF LIABILITY. In the event (i) Yahoo fails to publish an
advertisement in accordance with the schedule provided in the Insertion Order,
(ii) Yahoo fails to deliver the number of total page views specified in the
Insertion Order (if any) by the end of the specified period, or (iii) of any
other failure, technical or otherwise, of such advertisement to appear as
provided in the Insertion Order, the sole liability of Yahoo to Advertiser shall
be limited to, at Yahoo's sole discretion, a pro rata refund of the advertising
fee representing undelivered page views, placement of the advertisement at a
later time in a comparable position, or extension of the term of the Insertion
Order until total page views are delivered. In no event shall Yahoo be
responsible for any consequential, special, punitive or other damages,
including, without limitation, lost revenue or profits, in any way arising out
of or related to the Insertion Order/Standard Terms or publication of the
advertisement, even if Yahoo has been advised of the possibility of such
damages. Without limiting the foregoing, Yahoo shall have no liability for any
failure or delay resulting from any governmental action, fire, flood,
insurrection, earthquake, power failure, riot, explosion, embargo, strikes
whether legal or illegal, labor or material shortage, transportation
interruption of any kind, work slowdown or any other condition beyond the
control of Yahoo affecting production or delivery in any manner.

7. ADVERTISERS REPRESENTATIONS; INDEMNIFICATION. Advertisements are accepted
upon the representation that Advertiser has the right to publish the contents of
the advertisement without infringing the rights of any third party and without
violating any law. In consideration of such publication, Advertiser agrees, at
its own expense, to indemnify, defend and hold harmless Yahoo, and its
employees, representatives, agents and affiliates, against any and all expenses
and losses of any kind (including reasonable attorneys' fees and costs) incurred
by Yahoo in connection with any claims, administrative proceedings or criminal
investigations of any kind arising out of publication of the advertisement
and/or any material of Advertiser to which users can link through the
advertisement (including without limitation, any claim of trademark or copyright
infringement, defamation, breach of confidentiality, privacy violation, false or
deceptive advertising or sales practices).

8. PROVISION OF ADVERTISING MATERIALS. Advertiser will provide all materials for
the advertisement in accordance with Yahoo's policies in effect from time to
time, including (without limitation) the manner of transmission to Yahoo and the
lead-time prior to publication of the advertisement. Yahoo shall not be required
to publish any advertisement that is not received in accordance with such
policies and reserves the right to charge Advertiser, at the rate specified in
the Insertion Order, for inventory held by Yahoo pending receipt of acceptable
materials from Advertiser which are past due. Advertiser hereby grants to Yahoo
a non-exclusive, worldwide, fully paid license to use, reproduce and display the
advertisement (and the contents, trademarks and brand features contained
therein) in accordance herewith.

9. RIGHT TO REJECT ADVERTISEMENT. All contents of advertisements are subject to
Yahoo's approval. Yahoo reserves the right to reject or cancel any
advertisement, insertion order, URL link, space reservation or position
commitment, at any time, for any reason whatsoever (including belief by Yahoo
that placement of advertisement, URL link, etc., may subject Yahoo to criminal
or civil liability).

                                       10
<PAGE>

10. CANCELLATIONS. Except as otherwise provided in the Insertion Order, the
Insertion Order is non-cancelable by Advertiser.

11. CONSTRUCTION. No conditions other than those set forth in the Insertion
Order or these Standard Terms shall be binding on Yahoo unless expressly agreed
to in writing by Yahoo. In the event of any inconsistency between the Insertion
Order and the Standard Terms, the Standard Terms shall control.

12. MISCELLANEOUS. These Standard Terms, together with the Insertion Order, (i)
shall be governed by and construed in accordance with, the laws of the State of
California, without giving effect to principles of conflicts of law; (ii) may be
amended only by a written agreement executed by an authorized representative of
each party; and (iii) constitute the complete and entire expression of the
agreement between the parties, and shall supersede any and all other agreements,
whether written or oral, between the parties. Advertiser shall make no public
announcement regarding the existence or content of the Insertion Order without
Yahoo's written approval, which may be withheld at Yahoo's sole discretion. Both
parties consent to the jurisdiction of the courts of the State of California
with respect to any legal proceeding arising in connection with the Insertion
Order/Standard Terms.<PAGE>

                                                                 Exhibit 10.1A

                           Burlington Business Center
                             67 South Bedford Street
                            Burlington, Massachusetts
                                ("the Building")

                                 SIXTH AMENDMENT
                                 March 10, 2000

            LANDLORD:          Gateway Rosewood, Inc., successor-in-interest to
                               Sumitomo Life Realty (N.Y.), Inc.

            TENANT:            Lightbridge, Inc.

            EXISTING
            PREMISES:          An area on the first (1st) floor East Pod of the
                               Building, containing 21,055 rentable square feet,
                               substantially as shown on Lease Plan, Exhibit F,
                               Sheet 1; an area on the second (2nd) floor East
                               Pod of the Building, containing 21,892 rentable
                               square feet, substantially as shown on Lease
                               Plan, Exhibit F, Sheet 2; an area ("Third
                               Amendment Premises") on the second (2nd) floor,
                               Pod C of the Building, containing 220 square feet
                               of Rentable Floor Area, substantially as shown on
                               Exhibit A, Third Amendment; an area on the third
                               (3rd) floor East Pod of the Building, containing
                               3,411 rentable square feet, substantially as
                               shown on Lease Plan, Exhibit F, Sheet 3; and an
                               area on the fourth (4th) floor West Lobby of the
                               Building, containing 11,226 square feet of
                               Rentable Floor Area, substantially as shown on
                               Exhibit A, Second Amendment, dated October 6,
                               1997; an area, known as the Generator Premises,
                               adjacent to the Building more particularly shown
                               on Exhibit A, First Amendment dated July 22,
                               1997; an area on the third (3rd) floor, Pod C of
                               the Building, containing 7,733 square feet of
                               Rentable Area, substantially as shown on Exhibit
                               A, Fourth Amendment, dated July 16, 1999 ("Fourth
                               Amendment Premises"); and an area on the third
                               (3rd) floor of Pod C of the Building, containing
                               3,982 square feet of Rentable Floor Area,
                               substantially as shown on Exhibit A, Fifth
                               Amendment

                                      -1-
<PAGE>

     ORIGINAL LEASE
     LEASE    EXECUTION
     DATA:    DATE:            March 5, 1997

              TERMINATION
              DATE IN RESPECT
              OF EXISTING
              PREMISES (EXCEPT
              THIRD AMENDMENT
              PREMISES):       May 31, 2004

              TERMINATION
              DATE IN RESPECT
              OF THIRD
              AMENDMENT
              PREMISES:        March 31, 2001

              TERMINATION
              DATE IN RESPECT
              OF SIXTH AMENDMENT
              PREMISES:        October 31, 2005

              PREVIOUS
              LEASE
              AMENDMENTS:      First Amendment dated July 22, 1997
                               Second Amendment dated October 6, 1997
                               Third Amendment dated as of March 15, 1999
                               Fourth Amendment dated July 16, 1999
                               Fifth Amendment dated March 10, 2000

              SIXTH
              AMENDMENT
              PREMISES:        Area A:   An area on the second (2nd) floor,
                                         Center Pod of the Building, containing
                                         7,320 square feet of Rentable Floor
                                         Area, substantially as shown on Exhibit
                                         A, Sixth Amendment, a copy of which is
                                         attached hereto and incorporated by
                                         reference herein

                                      -2-
<PAGE>

                               Area B:   An area on the second (2nd) floor of
                                         Pod B of the Building, containing 8,431
                                         square feet of Rentable Floor Area,
                                         substantially as shown on Exhibit A,
                                         Sixth Amendment, a copy of which is
                                         attached hereto and incorporated by
                                         reference herein

                               Area C:   An area on the second (2nd) floor,
                                         Pod B of the Building, containing 4,000
                                         square feet of Rentable Floor Area,
                                         substantially as shown on Exhibit A,
                                         Sixth Amendment, a copy of which is
                                         attached hereto and incorporated by
                                         reference herein

      WHEREAS, Tenant desires to lease additional premises located in the
Building, to wit, the Sixth Amendment Premises;

      WHEREAS, Landlord is willing to lease the Sixth Amendment Premises to
Tenant upon the terms and conditions hereinafter set forth;

      NOW THEREFORE, the parties hereby agree that the above-described lease, as
previously amended ("the Lease"), is hereby further amended as follows:

      1.    TERMINATION OF TEMPORARY PREMISES TENANCY AGREEMENT

      The parties acknowledge that Tenant has executed a Temporary Premises
Tenancy Agreement ("Temporary Premises Tenancy Agreement"), in respect of Area
B, dated February 1, 2000, by and between Landlord, as landlord and Tenant, as
tenant. The parties hereby further acknowledge that the Temporary Premises
Tenancy Agreement is superseded in all respects by this Sixth Amendment, and
therefore that the Temporary Premises Tenancy Agreement is hereby deemed void
and is of no further force or effect.

      2.    DEMISE OF THE SIXTH AMENDMENT PREMISES

      Landlord hereby leases and demises to Tenant, and Tenant hereby hires and
takes from Landlord, the Sixth Amendment Premises. Said demise of the Sixth
Amendment Premises shall be upon all of the terms and conditions of the Lease
applicable to the Existing Premises except as follows:

                                      -3-
<PAGE>

      I.    AREA A

      A. The Term Commencement Date in respect of Area A shall be November 1,
2000 or, if later, the date Area A is delivered to Tenant by Landlord.

      B. The Rent Commencement Date in respect of Area A shall be the earlier
of: (i) sixty (60) days after the Term Commencement Date in respect of Area A or
(ii) the date Tenant or those claiming by, through or under Tenant start to use
Area A for purposes permitted under the Lease.

      C. The Termination Date in respect of Area A shall be October 31, 2005.

      D. Annual Fixed Rent in respect of Area A shall be Two Hundred Twelve
Thousand Two Hundred Eighty and 00/100 Dollars ($212,280.00) (i.e., a monthly
payment of $17,690.00) (i.e., $29.00 per rentable square foot).

      E. Tenant's Operating Expense Base in respect of Area A shall be the
actual amount of Operating Expenses Allocable to Area A for calendar year 2000.

      F. Tenant's Tax Base in respect of Area A shall be the actual amount of
Tax Expenses Allocable to Area A for fiscal/tax year 2001.

      G. Tenant's Annual Electricity Charge in respect of Area A shall be Six
Thousand Nine Hundred Fifty-Four and 00/100 Dollars ($6,954.00), based upon a
charge of $.95 per square foot of Rentable Floor Area in respect of Area A
(i.e., $579.50 per month). Tenant's obligation to commence paying the Annual
Electricity Charge in respect of Area A shall commence as of the Rent
Commencement Date in respect of Area A.

      II.   AREA B

      A. The Term Commencement Date in respect of Area B shall be March 1, 2000.

      B. The Rent Commencement Date in respect of Area B shall be November 1,
2000.

      C. The Termination Date in respect of Area B shall be October 31, 2005.

      D. Annual Fixed Rent in respect of Area B shall be Two Hundred Forty-Four
Thousand Four Hundred Ninety-Nine and 00/100 Dollars ($244,499.00) (i.e., a
monthly payment of $20,374.92) (i.e., $29.00 per rentable square foot).

                                      -4-
<PAGE>

      E. Commencing as of the Term Commencement Date in respect of Area B
through the Rent Commencement Date in respect of Area B, the Operating Expenses
in respect of Area B, payable by Tenant, shall be the actual amount of Operating
Expenses Allocable to Area B for calendar year 2000 and shall be prorated for a
portion of any calendar year. Commencing as of the Rent Commencement Date in
respect of Area B, Tenant's Operating Expenses Base in respect of Area B shall
be the actual amount of Operating Expenses Allocable to Area B for calendar year
2000.

      F. Commencing as of the Term Commencement Date in respect of Area B
through the Rent Commencement Date in respect of Area B, the Taxes in respect of
Area B, payable by Tenant, shall be the actual amount of Tax Expenses Allocable
to Area B for fiscal/tax year 2001. Commencing as of the Rent Commencement Date
in respect of Area B, Tenant's Tax Base in respect of Area B shall be the actual
amount of Tax Expenses Allocable to Area B for calendar year 2000.

      G. Tenant's Annual Electricity Charge in respect of Area B shall be Eight
Thousand Nine and 45/100 Dollars ($8,009.45), based upon a charge of $.95 per
square foot of Rentable Floor Area in respect of Area B (i.e., $667.45 per
month). Tenant's obligation to commence paying the Annual Electricity Charge in
respect of Area B shall commence as of the Term Commencement Date in respect of
Area B.

      III.  AREA C

      A. The Term Commencement Date in respect of Area C shall be the Term
Commencement Date in respect of Area A.

      B. The Rent Commencement Date in respect of Area C shall be the earliest
of: (i) one hundred fifty (150) days after the Term Commencement Date in respect
of Area C; (ii) ninety (90) days after Tenant or anyone claiming by, through or
under Tenant commences construction in Area C, or (iii) sixty (60) days after
Tenant or anyone claiming by, through or under Tenant first commences to use
Area C for purposes permitted under the Lease.

      C. The Termination Date in respect of Area C shall be October 31, 2005.

      D. Annual Fixed Rent in respect of Area C shall be One Hundred Sixteen
Thousand and 04/100 Dollars ($116,000.00) (i.e., a monthly payment of $9,666.67)
(i.e., $29.00 per rentable square foot).

      E. Tenant's Operating Expense Base in respect of Area C shall be the
actual amount of Operating Expenses Allocable to Area C for calendar year 2000.

      F. Tenant's Tax Base in respect of Area C shall be the actual amount of
Tax Expenses Allocable to Area C for fiscal/tax year 2001.

                                      -5-
<PAGE>

      G. Tenant's Annual Electricity Charge in respect of Area C shall be Three
Thousand Eight Hundred and 00/100 Dollars ($3,800.00), based upon a charge of
$.95 per square foot of Rentable Floor Area in respect of Area C (i.e., $316.67
per month). Tenant's obligation to commence paying the Annual Electricity Charge
in respect of Area C shall commence as of the Rent Commencement Date in respect
of Area C.

      IV.   PROVISIONS APPLICABLE TO ALL PORTIONS OF THE SIXTH AMENDMENT
            PREMISES

      A. Article XI of the Lease shall have no applicability to the Sixth
Amendment Premises.

      B. In the event of any conflict between the provisions of the Lease and
the provisions of this Amendment, the provisions of this Amendment shall
control.

      3.    CONDITION OF SIXTH AMENDMENT PREMISES

      Notwithstanding anything to the contrary herein or in the Lease contained,
Tenant shall lease the Sixth Amendment Premises "as-is", in the condition in
which the Sixth Amendment Premises are in as of the Term Commencement Date in
respect of the Sixth Amendment Premises without any obligation on the part of
Landlord to prepare or construct the Sixth Amendment Premises for Tenant's
occupancy, and without any representation or warranty by Landlord as to the
condition of the Sixth Amendment Premises.

      4.    LANDLORD'S CONTRIBUTION IN RESPECT OF SIXTH AMENDMENT PREMISES

      Landlord shall provide to Tenant up to Three Hundred Twenty-Five Thousand
Eight Hundred Ninety-One and 50/100 ($325,891.50) Dollars ("Landlord's Sixth
Amendment Contribution") towards the cost of leasehold improvements to be
installed by Tenant in the Sixth Amendment Premises; including, without
limitation, hard costs, architectural and engineering fees incurred by Tenant in
preparing Tenant's plans, moving costs and computer wiring and cabling costs
("Tenant's Sixth Amendment Premises Work"). Landlord's Sixth Amendment
Contribution shall be disbursed to Tenant in the same manner and subject to the
same conditions and limitations as set forth on Exhibit B to the Lease, except:

      A. The first two (2) sentences of Paragraph B of Exhibit B to the Lease
shall not apply to Tenant's Sixth Amendment Premises Work.

      B. For the purpose of clause (iii) of Paragraph D of Exhibit B to the
Lease, wherever the date "September 30, 1997" is used, the date "six (6) months
after the Term

                                      -6-
<PAGE>

Commencement Date in respect of Area A" shall be substituted therefor in respect
of Area A.

      C. For the purpose of clause (iii) of Paragraph D of Exhibit B to the
Lease, wherever the date "September 30, 1997" is used, the date "six (6) months
after the Term Commencement Date in respect of Area B" shall be substituted
therefor in respect of Area B.

      D. For the purpose of clause (iii) of Paragraph D of Exhibit B to the
Lease, wherever the date "September 30, 1997" is used, the date "six (6) months
after the Term Commencement Date in respect of Area C" shall be substituted
therefor in respect of Area C.

      5.    BROKER

      Landlord and Tenant each warrant that they have had no dealings with any
broker or agent, other than Meredith & Grew ("Broker"), in connection with this
Sixth Amendment and covenant to defend, hold harmless and indemnify each other
from and against any and all cost, expense or liability for any compensation,
commissions and charges claimed by any broker or agent, other than Broker,
claiming by or through them with respect to dealings in connection with this
Sixth Amendment or the negotiation thereof.

      6.    LETTER OF CREDIT

      The parties hereby acknowledge that Landlord is presently holding a Letter
of Credit in an amount equal to One Million and 00/100 ($1,000,000.00) Dollars,
pursuant to Article X of the Lease. The parties hereby further acknowledge that
Landlord shall continue to hold said Letter of Credit during the term of the
Lease.

      7.    TENANT'S OPTION TO EXTEND THE TERM OF THE LEASE IN RESPECT OF THE
            SIXTH AMENDMENT PREMISES

      Tenant shall have the following right to extend the term of the Lease in
respect of the Sixth Amendment Premises. Tenant's extension option under this
Paragraph 7 shall be independent of Tenant's extension option with respect to
the Existing Premises as set forth in Article XI of the Lease.

      A. On the conditions, which conditions Landlord may waive, at its
election, by written notice to Tenant at any time, that Tenant is not in default
of its covenants and obligations under the Lease beyond any applicable period of
notice and cure, and that Lightbridge, Inc., itself, is occupying the entirety
of the Sixth Amendment Premises, both as of the time of option exercise and as
of the commencement of the hereinafter described additional term, Tenant shall
have the option to extend the term of the Lease in respect of

                                      -7-
<PAGE>

the Sixth Amendment Premises for one (1) additional five (5) year term, such
additional term commencing as of November 1, 2005 and terminating as of October
31, 2010. Tenant may exercise such option to extend by giving Landlord written
notice on or before February 1, 2005. Upon the timely giving of such notice, the
term of the Lease in respect of the Sixth Amendment Premises shall be deemed
extended upon all of the terms and conditions of the Lease, except that Landlord
shall have no obligation to construct or renovate the Sixth Amendment Premises
and that the Annual Fixed Rent, the Annual Electricity Charge, Tenant's
Operating Expense Base, and Tenant's Tax Base during such additional term shall
be as hereinafter set forth. If Tenant fails to give timely notice, as
aforesaid, Tenant shall have no further right to extend the term of the Lease in
respect of the Sixth Amendment Premises, time being of the essence of this
Paragraph 7.

      B. Annual Fixed Rent

      The Annual Fixed Rent during the additional term of the Lease in respect
of the Sixth Amendment Premises shall be based upon the Fair Market Rental
Value, as defined in Article XIII of the Lease, as of the commencement of the
additional term of the Lease in respect of the Sixth Amendment Premises,
provided however, that in no event shall the sum of Annual Fixed Rent, the
Annual Electricity Charge, Operating Expenses Allocable to the Premises and Tax
Expenses Allocable to the Sixth Amendment Premises payable by Tenant for any
twelve-(12)-month period during the additional term be less than the sum of
Annual Fixed Rent, Annual Electricity Charge, Operating Expenses Allocable to
the Premises and Tax Expenses Allocable to the Sixth Amendment Premises payable
by Tenant during the immediately preceding twelve (12) month period.

      C. Tenant shall have no further option to extend the term of the Lease in
respect of the Sixth Amendment Premises other than the one (1) additional five
(5) year term herein provided.

      D. Notwithstanding the fact that upon Tenant's exercise of the herein
option to extend the term of the Lease in respect of the Sixth Amendment
Premises such extension shall be self-executing, as aforesaid, the parties shall
promptly execute a lease amendment reflecting such additional term after Tenant
exercises the herein option, except that the Annual Fixed Rent payable in
respect of such additional term, the Annual Electricity Charge payable during
the initial term, Tenant's Operating Expenses Base during such additional term,
and Tenant's Tax Base during such additional term, may not be set forth in said
amendment. Subsequently, after such Annual Fixed Rent, the Annual Electricity
Charge, Tenant's Operating Expenses Base, and Tenant's Tax Base are determined,
the parties shall execute a written agreement confirming the same. The execution
of such lease amendment shall not be deemed to waive any of the conditions to
Tenant's exercise of its rights under this Paragraph 7, unless otherwise
specifically provided in such lease amendment.

                                      -8-
<PAGE>

      8.    TENANT'S CANCELLATION RIGHT UPON LATE DELIVERY OF PORTIONS OF THE
            SIXTH AMENDMENT PREMISES

      If the Term Commencement Date in respect of any portion of the Sixth
Amendment Premises has not occurred on or before March 1, 2001, then Tenant
shall have the right to terminate the term of the Lease in respect of such
portion of the Sixth Amendment Premises by giving Landlord a written thirty (30)
day termination notice. If the Term Commencement Date in respect of such portion
of the Sixth Amendment Premises does not occur on or before the thirtieth (3Oth)
day after Landlord receives such termination notice, then the term of the Lease
in respect of such portion of the Sixth Amendment Premises shall terminate as of
said thirtieth (3Oth) day. If the Term Commencement Date in respect of such
portion of the Sixth Amendment Premises occurs on or before the thirtieth (30th)
day after Landlord receives such termination notice, then said termination
notice shall be void and of no further force or effect and Tenant shall have no
further right to terminate the Lease in respect of such portion of the Sixth
Amendment Premises pursuant to this Paragraph 8.

      9. As herein amended, the Lease is ratified, confirmed and approved in all
respects.

      EXECUTED UNDER SEAL as of the date first above written.

LANDLORD:                                     TENANT:
Invesco Realty Advisors                       LIGHTBRIDGE, INC.
Division of Invesco, Inc.
as Agent for:
GATEWAY ROSEWOOD, INC.

By: /s/ Michael Kirby  Vice President         By: /s/ Pamela A. Reeve      CEO
    ---------------------------------             ------------------------------
         (Name)            (Title)                     (Name)            (Title)
         Hereunto Duly Authorized                      Hereunto Duly Authorized

Date Signed:   4/28/2000                      Date Signed:   4/28/2000
             ---------------------                         ---------------------

                                      -9-

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