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                                                                   EXHIBIT 10.43

THIS WARRANT AND THE SECURITIES ISSUABLE UPON THE EXERCISE HEREOF HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933. THEY MAY NOT BE SOLD, OFFERED FOR
SALE, PLEDGED, HYPOTHECATED, OR OTHERWISE TRANSFERRED EXCEPT PURSUANT TO AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933, OR AN OPINION
OF COUNSEL SATISFACTORY TO THE COMPANY THAT REGISTRATION IS NOT REQUIRED UNDER
SUCH ACT OR UNLESS SOLD PURSUANT TO RULE 144 UNDER SUCH ACT.

                        WARRANT TO PURCHASE COMMON STOCK

                                       OF

                               WEBSIDESTORY, INC.

                            VOID AFTER JUNE ___, 2003

This Warrant is issued to _______________ ("Holder") by WebSideStory, Inc., a
California corporation ( the "Company"), on June ___, 2000. This Warrant is
issued pursuant to the terms of that certain Stock Purchase Agreement dated as
of the date hereof (the "Purchase Agreement") in connection with the Company's
issuance and sale of 1,754,034 shares of its Convertible Redeemable
Participating Preferred Stock and 11.66667 shares of its Redeemable Preferred
Stock.

1 Purchase of Shares. Subject to the terms and conditions hereinafter set forth
and compliance with applicable laws, the Holder is entitled, upon surrender of
this Warrant at the principal office of the Company (or at such other place as
the Company shall notify the Holder in writing), to purchase from the Company
for up to an aggregate purchase price of $____________ a number of fully paid
and nonassessable shares of Common Stock of the Company, (the "Shares") at a
price per share of $0.3538676 (the "Exercise Price"); provided, however, that if
the Conversion Price per share of the Convertible Redeemable Participating
Preferred Stock, as defined in the Company's Amended and Restated Articles of
Incorporation, as amended from time to time (the "Restated Articles") is
adjusted as provided in the Restated Articles, then the Exercise Price shall
equal the Conversion Price as adjusted.

2 Exercise Period. This Warrant shall be exercisable, in whole or in part during
the term commencing on April 1, 2001 (the "Warrant Exercisable Date") and ending
at 5:00 p.m. on June 1, 2003; provided, however, that if any of the following
events occurs before the Warrant Exercisable Date, then this Warrant shall not
be exercisable and shall become null and void: (a) a Qualified Public Offering
as defined in the Restated Articles; (b) the closing of the sale or transfer of
all or substantially all of the assets of the Company to another entity (the
"Acquiring Person") at a purchase price of $150,000,000.00 or more; or (c) the
closing of the acquisition of the Company at a purchase price of $150,000,000.00
or more by an Acquiring Person by means of merger, consolidation or other
transaction or series of related transactions, resulting in the exchange of the
outstanding shares of the Company's capital stock such that the stockholders of
the Company prior to such transaction own, directly or indirectly, less than 50%
of the voting power of the surviving entity, this Warrant shall, on the date of
such closing, no longer be

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exercisable and become null and void. Furthermore, if either of the following
events occurs after the Warrant Exercisable Date, then this Warrant shall no
longer be exercisable and shall become null and void: (i) the closing of the
sale or transfer of all or substantially all of the assets of the Company to an
Acquiring Person; or (ii) the closing of the acquisition of the Company by an
Acquiring Person by means of merger, consolidation or other transaction or
series of related transactions, resulting in the exchange of the outstanding
shares of the Company's capital stock such that the stockholders of the Company
prior to such transaction own, directly or indirectly, less than 50% of the
voting power of the surviving entity, this Warrant shall, on the date of such
closing, no longer be exercisable and become null and void. In the event of a
proposed transaction of the kind described in the preceding sentence, the
Company shall notify the Holder at least fifteen (15) days prior to the closing
of such event or transaction. Each of the transactions specified in clauses (i)
and (ii) of the preceding sentence is hereinafter referred to as a "Corporate
Transaction."

3 Method of Exercise. While this Warrant remains outstanding and exercisable in
accordance with Section 2 above, the Holder may exercise, in whole or in part,
the purchase rights evidenced hereby. Such exercise shall be effected by:

        (a) the surrender of the Warrant, together with a duly executed copy of
            the form of Notice of Election attached hereto, to the Secretary of
            the Company at its principal offices; and

        (b) the payment to the Company of an amount equal to the aggregate
            Exercise Price for the number of Shares being purchased.

4 Conversion. If the Company's Common Stock is listed for trading on a national
exchange, in lieu of exercising this Warrant pursuant to Section 3, the Holder
may elect to convert this Warrant, without the payment by the Holder of any
additional consideration, into shares of Common Stock equal to the value of this
Warrant (or the portion hereof being cancelled) by surrender of this Warrant to
the Secretary of the Company at its principal office together with notice of
such election, in which event the Company shall issue to the Holder a number of
shares of Common Stock computed using the following formula:

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

Where: X = The number of shares of Common Stock to be issued to the Holder
pursuant to this conversion.

Y = The number of Shares in respect of which the election to convert is made;

A = The fair market value of one share of the Common Stock at the time the
election to convert is made;

B = The exercise Price (as adjusted to the date of the conversion).

For purposes of this Section 4, the fair market value of one share of Common
Stock as of a particular day shall be determined by reference to the average bid
and ask price for Common

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Stock at the close of trading over the five (5) immediately preceeding days on
which the relevant market is open for trading.

5 Certificates for Shares. Upon the exercise of the purchase or conversion
rights evidenced by this Warrant, one or more certificates for the number of
Shares so purchased shall be issued as soon as practicable thereafter (with
appropriate restrictive legends, if applicable), and in any event within thirty
(30) days of the delivery of the subscription notice.

6 Issuance of Shares. The Company covenants that the Shares, when issued
pursuant to the exercise of this Warrant, will be duly and validly issued, fully
paid and nonassessable and free from all taxes, liens, and charges with respect
to the issuance thereof other than those created by or imposed upon Holder
thereof through no action by the Company.

7 No Fractional Shares or Scrip. No fractional shares or scrip representing
fractional shares shall be issued upon the exercise or conversion of this
Warrant, but in lieu of such fractional shares the Company shall make a cash
payment therefore on the basis of the Exercise Price then in effect.

8 No Stockholder Rights. Prior to exercise or conversion of this Warrant, the
Holder shall not be entitled to any rights of a stockholder with respect to the
Shares, including (without limitation) the right to vote such Shares, receive
dividends or other distributions thereon, exercise preemptive rights or to be
notified of stockholder meetings, and the Holder shall not be entitled to any
notice or other communication concerning the business or affairs of the Company.
However, nothing in this Section 9 shall limit the right of the Holder to be
provided the notices required under this Warrant.

9 Transfer of Warrant. Subject to compliance with applicable federal and state
securities laws any other contractual restrictions between the Company and the
Holder, this Warrant and all rights hereunder are transferable in whole or in
part by the Holder to any person or entity upon written notice to the Company.
The transfer shall be recorded on the books of the Company upon the surrender of
this Warrant, properly endorsed, to the company and its principal offices, and
the payment to the Company of all transfer taxes and other government charges
imposed on such transfer. In the event of a partial transfer, the Company shall
issue to the Holder one or more appropriate new warrants.

10 Successors and Assigns. The terms and provisions of this Warrant shall inure
to the benefit of, and be binding upon, the Company and the Holder and their
respective successors and assigns.

11 Amendments and Waivers. Any term of this Warrant may be amended and the
observance of any term of this Warrant may be waived (either generally or in a
particular instance and either retroactively or prospectively), with the written
consent of the Company and the holders of a majority of shares of Common Stock
issued or issuable upon exercise of Warrants issued pursuant to the Purchase
Agreement. Any waiver or amendment effected in accordance with this Section 12
shall be binding upon each holder of any Shares purchased under this Warrant at
the time outstanding, each future holder of all such Shares, and the Company.

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12 Effect of Amendment or Waiver. The Holder acknowledges that by the operation
of Section 12 hereof, the holders of a majority of shares of Common Stock issued
or issuable upon exercise of Warrants issued pursuant to the Purchase Agreement
will have the right and power to diminish or eliminate all rights of such Holder
under this Warrant.

13 Notices. All notices required under this Warrant shall be deemed to have been
given or made for all purposes (i) upon personal delivery, (ii) upon
confirmation receipt that the communication was successfully sent to the
applicable number if sent by facsimile; (iii) one day after being sent, when
sent by professional overnight courier service, or (iv) five days after posting
when sent by registered or certified mail. Notices to the Company shall be sent
to the principal office of the Company (or at such other place as the Company
shall notify the Holder hereof in writing). Notices to the Holder shall be sent
to the address of the Holder on the books of the Company (or at such other place
as the Holder shall notify the Company hereof in writing).

14 Attorneys' Fees. If any action of law or equity is necessary to enforce or
interpret the terms of this Warrant, the prevailing party shall be entitled to
its reasonable attorneys' fees, costs and disbursements in addition to any other
relief to which it may be entitled.

15 Captions. The section and subsection headings of this Warrant are inserted
for convenience only and shall not constitute a part of this Warrant in
construing or interpreting any provision hereof.

16 Governing Law. This Warrant shall be governed by the laws of the State of
California as applied to agreements among California residents made and to be
performed entirely within the State of California.

                                        WEBSIDESTORY, INC.

                                        BY:
                                           -------------------------------------
                                           John J. Hentrich
                                           President and Chief Executive Officer

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                               NOTICE OF EXERCISE

To: WebSideStory

The undersigned hereby elects to (check applicable subsection):

____      (a) Purchase _____________ shares of Common Stock of WebSideStory,
          Inc. pursuant to the terms of the attached Warrant and payment of the
          Exercise Price required under such Warrant accompanies this notice;

OR

____      (b) Exercise the attached Warrant for (all of the shares) [________ of
          the shares] (cross out inapplicable phrase) purchasable under the
          Warrant pursuant to the conversion provisions of Section 4 of such
          Warrant.

The undersigned hereby represents and warrants that the undersigned is acquiring
such shares for its own account for investment purposes only, and not for resale
or with a view to distribution of such shares or any part thereof.

                                            WARRANTHOLDER:

                                            ---------------------------

                                            By:
                                               ---------------------------------
                                            Name:
                                                 -------------------------------
                                            Title:
                                                  ------------------------------

                                            Address:
                                                    ----------------------------

Date:
     ---------------
Name in which shares should be registered:

------------------------------------------

                                       5<PAGE>   1
                                                                     EXHIBIT 4.2

                            EXCEL LEGACY CORPORATION

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

                [SEAL]                                     [SEAL]
 THIS CERTIFICATE IS TRANSFERABLE IN         SEE REVERSE FOR CERTAIN DEFINITIONS
THE CITY OF BOSTON, MA OR NEW YORK, NY                 CUSIP 300665

This Certifies that

is the record holder of

      FULLY PAID AND NON-ASSESSABLE SHARES OF SERIES B LIQUIDATING PREFERENCE
      CONVERTIBLE PREFERRED STOCK DUE 2005, $.01 PAR VALUE PER SHARE, OF

                            EXCEL LEGACY CORPORATION

      Transferable 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 by
      the Transfer Agent and registered by the Registrar.

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

            Dated
<TABLE>
            <S>                           <C>                           <C>
                                          [EXCEL LEGACY CORPORATION
            /s/ RICHARD B. MUIR                CORPORATE SEAL           /s/ GARY B. SABIN
                ---------------------           NOV 18, 1997                ---------------------
                SECRETARY                        DELAWARE]                  PRESIDENT
</TABLE>

COUNTERSIGNED AND REGISTERED
      BankBoston, N.A.
TRANSFER AGENT AND REGISTRAR

BY /s/ MARY PENEZIC
       ---------------------
       AUTHORIZED SIGNATURE
<PAGE>   2
THE SHARES EVIDENCED HEREBY HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE
U.S. SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITY ACT") OR ANY STATE
SECURITIES LAWS, AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD WITHIN THE UNITED
STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS EXCEPT, AS SET
FORTH BELOW. BY ITS ACQUISITION HEREOF, THE HOLDER (1) REPRESENTS THAT IT IS A
"QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED BY RULE 144A UNDER THE SECURITIES
ACT); (2) WHICH EXCEL LEGACY CORPORATION (THE "COMPANY") OR ANY "AFFILIATE" (AS
DEFINED IN RULE 144 UNDER THE SECURITIES ACT) OF THE COMPANY WAS THE OWNER OF
THE SHARES (THE "RESTRICTION TERMINATION DATE") RESELL OR OTHERWISE TRANSFER THE
SHARES EVIDENCED HEREBY OR THE COMMON STOCK ISSUABLE UPON CONVERSION OF SUCH
SHARES EXCEPT (A) TO THE COMPANY OR ANY SUBSIDIARY THEREOF, (B) INSIDE THE
UNITED STATES TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A
UNDER THE SECURITIES ACT, (C) INSIDE THE UNITED STATES TO AN INSTITUTIONAL
ACCREDITED INVESTOR THAT, PRIOR TO SUCH TRANSFER, FURNISHES TO BANKBOSTON, N.A.,
AS TRANSFER AGENT, A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND
AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF THE SHARES EVIDENCED
HEREBY (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM SUCH TRUSTEE OR A
SUCCESSOR TRUSTEE, AS APPLICABLE), (D) OUTSIDE THE UNITED STATES IN AN OFFSHORE
TRANSACTION IN COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT, (E) PURSUANT
TO THE EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE SECURITIES ACT
(IF AVAILABLE) OR (F) PURSUANT TO A REGISTRATION STATEMENT WHICH HAS BEEN
DECLARED EFFECTIVE UNDER THE SECURITIES ACT (AND WHICH CONTINUES TO BE EFFECTIVE
AT THE TIME OF SUCH TRANSFER); AND (3) AGREES THAT IT WILL DELIVER TO EACH
PERSON TO WHOM THE SHARES EVIDENCED HEREBY ARE TRANSFERRED A NOTICE
SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. IN CONNECTION WITH ANY TRANSFER OF
THE SHARES EVIDENCED HEREBY BEFORE THE RESTRICTION TERMINATION DATE. THE HOLDER
MUST CHECK THE APPROPRIATE BOX SET FORTH ON THE REVERSE HEREOF RELATING TO THE
MANNER OF SUCH TRANSFER AND SUBMIT THESE SHARES TO BANKBOSTON, N.A., AS TRANSFER
AGENT (OR A SUCCESSOR TRANSFER AGENT, AS APPLICABLE). IF THE PROPOSED TRANSFER
IS PURSUANT TO CLAUSES (C), (D) OR (E) ABOVE, THE HOLDER MUST, PRIOR TO SUCH
TRANSFER, FURNISH TO BANKBOSTON, N.A., AS TRANSFER AGENT, SUCH CERTIFICATIONS,
LEGAL OPINIONS OR OTHER INFORMATION AS IT MAY REASONABLY REQUIRE TO CONFIRM THAT
SUCH TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION
NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. THIS LEGEND
WILL BE REMOVED UPON ANY TRANSFER OF THE SHARES EVIDENCED HEREBY UPON THE
RESTRICTION TERMINATION DATE. AS USED HEREIN, THE TERMS "OFFSHORE TRANSACTION,"
"UNITED STATES" AND "U.S. PERSON" HAVE THE MEANINGS GIVEN TO THEM BY REGULATIONS
UNDER THE SECURITIES ACT.

     THIS SECURITY WAS ISSUED WITH A REDEMPTION PREMIUM UNDER SECTION 306(C) OF
THE INTERNAL REVENUE CODE. YOU MAY CONTACT THE CHIEF FINANCIAL OFFICER OF THE
CORPORATION AT THE PRINCIPAL OFFICE OF THE CORPORATION, 16955 VIA DEL CAMPO,
SUITE 100, SAN DIEGO, CALIFORNIA 92127, TELEPHONE NUMBER: (619) 486-9400, WHO
WILL PROVIDE YOU WITH ANY REQUIRED INFORMATION REGARDING THE REDEMPTION PREMIUM.

     The Corporation shall furnish without charge to each stockholder who so
requests a statement of the powers, designations, preferences and relative,
participating, optional or other special rights of each class of stock of the
Corporation or series thereof and the qualifications, limitations or
restrictions of such preferences and/or rights. Such requests shall be made to
the Corporation's Secretary at the principal office of the Corporation.

     KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN, OR DESTROYED
THE CORPORATION WILL REQUIRE A BOND OF INDEMNITY AS A CONDITION TO THE ISSUANCE
OF A REPLACEMENT CERTIFICATE.

                   NOTICE OF ELECTION TO CONVERT
                  (CONVERTIBLE INTO COMMON STOCK)

         The undersigned hereby irrevocably elects to convert
                                                                        FOR
---------------------------------------------------------- shares    CONVERSION
of Series B Liquidating Preference Convertible Preferred Stock due      USE
2005, represented by the within certificate into shares of Common       ONLY
stock of EXCEL LEGACY CORPORATION (as such shares may be constituted
on the conversion date) in accordance with the provisions of the
Certificate of Incorporation, as amended, of the Corporation.

Dated
      --------------------

                         --------------------------------------
                                    Signature

     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 entities                          (Cust)     (Minor)
JT TEN  - as joint tenants with right                    under the Uniform Gifts
          of survivorship and not as                     to Minors Act ---------
          tenants in common                                           (Minor)
                                         UNIF TRF MIN ACT - --- Custodian (until
                                                   age --)  (Cust)
                                                   --------------- under Uniform
                                          Transfers   (Minor)
                                          to Minors Act ------------------------
                                                           (State)

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

PLEASE INSERT SOCIAL SECURITY
OR OTHER IDENTIFYING NUMBER
OF ASSIGNEE

--------------------------

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

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

------------------------------------------------------------------------ Shares
of the capital stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint

------------------------------------------------------------------ Attorney to
transfer the said stock on the books of the within named Corporation with full
power of substitution in the premises.

Dated ------------------

                                   X------------------------------------------

                                   X------------------------------------------
Signature(s) Guaranteed     NOTICE: THE SIGNATURES 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 WHATSOEVER.

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

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