Document:

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                                                                EXHIBIT 10.5

                             ALLIANCE IMAGING, INC.

                      DIRECTORS' DEFERRED COMPENSATION PLAN

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                             ALLIANCE IMAGING, INC.

                      DIRECTORS' DEFERRED COMPENSATION PLAN

                               TABLE OF CONTENTS

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                                                                            Page
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ARTICLE I   DEFINITIONS........................................................1

ARTICLE II  ELECTION TO DEFER..................................................2

ARTICLE III DEFERRED COMPENSATION ACCOUNTS.....................................3

ARTICLE IV  PAYMENT OF DEFERRED COMPENSATION...................................4

ARTICLE V   ADMINISTRATION.....................................................4

ARTICLE VI  AMENDMENT OF PLAN..................................................5

APPENDIX A  ...................................................................6

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                                    ARTICLE I

                                   DEFINITIONS

1.1   "Affiliate" shall mean, with respect to the KKR Partnership, or the
      Company any entity directly or indirectly controlling, controlled
      by, or under common control with the KKR Partnership or the Company.

1.2   "Board" shall mean the Board of Directors of the Company.

1.3   "Book Value" shall mean the "Book Value Per Share" as defined in the
      Stockholder's Agreement.

1.4   "Cash Account" shall mean the account created by the Company pursuant
      to Article III of this Plan in accordance with an election by a
      Director to receive deferred cash compensation under Article II hereof.

1.5   "Change of Control" means (a) (i) sales of all or substantially all of
      the assets of the Company to a Person who is not an Affiliate of the
      KKR Partnership, (ii) a sale by the KKR Partnership or any of its
      respective Affiliates resulting in more than 50% of the voting stock of
      the Company being held by a Person or group that is not an Affiliate of
      the KKR Partnership, or any of their respective Affiliates or (iii) a
      merger or consolidation of the Company into another Person which is not
      an Affiliate of the KKR Partnership; (b) if and only if any such event
      results in the inability of the KKR Partnership or any of its
      Affiliates to elect a majority of the Board of Directors of the Company
      (or the resulting entity).

1.6   "Common Stock" shall mean the common stock of the Company, par value $.01.

1.7   "Company" means Alliance Imaging, Inc.

1.8   "Director" shall mean a member of the Board who is not an employee of
      the Company or any of its subsidiaries.

1.9   "Fees" shall mean amounts earned for serving as a member of the Board,
      including any committees of the Board.

1.10  "KKR Partnership" shall mean the KKR 1996 Fund L.P., an affiliate of
      Kohlberg Kravis Roberts & Co. L.P.

1.11  "Person" shall mean an individual, partnership, corporation, business
      trust, joint stock company, trust, unincorporated association, joint
      venture, governmental authority or other entity of whatever nature.

1.12  "Phantom Share" shall mean a notional amount credited to the Stock
      Account of a Director, which is equivalent to the value of one share of
      Common Stock, determined in accordance with the terms of this Plan.

<PAGE>

1.13  "Plan" shall mean this Directors' Deferred Compensation Plan as it may
      be amended from time to time.

1.14  "Stock Account" shall mean the account created by the Company pursuant
      to Article III of this Plan in accordance with an election by a
      Director to receive stock-based compensation under Article II hereof.

1.15  "Stockholder's Agreement" shall mean the form of the agreements entered
      into as of November 2, 1999 by and between the Company, Viewer Holdings
      LLC, a Delaware limited liability company, and certain members of the
      management of the Company.

1.16  "Stock Value" shall mean, per share, for any given day, (i) if the
      Common Stock of the Company is not publicly traded, the "Initial Price
      Per Share" as defined in the Stockholder's Agreement plus any (positive
      or negative) change in the Book Value from the date the KKR Partnership
      made its initial investment in Common Stock through the day in
      question, and (ii) if the Common Stock of the Company is publicly
      traded, the closing price of the Company's Common Stock as reported on
      the exchange upon which such Common Stock is listed on such day or, if
      the closing price is not available for the Common Stock on a date in
      question, then the next preceding practicable date for which such
      closing price is available.

1.17  "Year" shall mean calendar year.

                                   ARTICLE II

                                ELECTION TO DEFER

2.1   A Director may elect, on or before December 31 of any Year, to defer
      payment of all or a specified part of all Fees earned during the Year
      following such election and in any succeeding Years (until the Director
      ceases to be a Director); PROVIDED, HOWEVER, that with respect to Year
      2000 a Director may elect, within thirty (30) days after adoption of
      this Plan, to defer all or a specified part of all Fees payable on or
      after the date of adoption of this Plan. Any person who shall become a
      Director during any Year, and who was not a Director of the Company on
      the preceding December 31, may elect, no later than seven (7) days
      after the Director's term begins, to defer payment of all or a
      specified part of such Fees payable during the remainder of such Year
      and for any succeeding Years. Any Fees deferred pursuant to this
      Paragraph shall be paid to the Director at the time(s) and in the
      manner specified in Article IV hereof, as designated by the Director.

2.2   The election to participate in the Plan and manner of payment shall be
      designated by submitting a letter in the form attached hereto as
      Appendix A to the Secretary of the Company.

2.3   The election shall continue from Year to Year unless the Director
      terminates it by written request delivered to the Secretary of the
      Company prior to the commencement of the Year for which the termination
      is first effective.

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                                   ARTICLE III

                         DEFERRED COMPENSATION ACCOUNTS

3.1   The Company shall maintain separate memorandum accounts for the Fees
      deferred by each Director.

3.2   The Company shall credit, on the date Fees would otherwise become
      payable, to the Cash Account of each Director the deferred portion of
      any Fees due the Director as to which an election to defer such Fees
      into the Cash Account has been made.

3.3   On the first day of each quarter, the Company shall credit the Cash
      Account of each Director with interest calculated on the basis of the
      balance in such account on the first day of each month of the preceding
      quarter at a rate equal to the three month $US LIBOR rate plus 225
      basis points as in effect from time to time.

3.4   The Company shall credit, on the date Fees would otherwise become
      payable, the Stock Account of each Director with the number of Phantom
      Shares that is equal to the quotient of (a) the deferred portion of any
      Fees due to the Director as to which an election to defer such Fees
      into the Stock Account has been made, DIVIDED by (b) the Stock Value.
      For purposes of this Section 3.4, the Stock Value shall be determined
      on the date Fees would otherwise have been paid.

3.5   The Company shall credit, on the date that any dividends are paid with
      respect to Common Stock, the Stock Account of each Director who has
      elected to defer Fees with the number of Phantom Shares that is equal
      to the quotient of (a) the cash dividends payable on the number of
      shares of Common Stock represented in each Director's Stock Account,
      DIVIDED by (b) the Stock Value on such dividend payment date. If
      adjustments are made to the outstanding shares of Common Stock as a
      result of split-ups, recapitalizations, mergers, consolidations and
      other business combinations, an appropriate adjustment also will be
      made in the number of Phantom Shares credited to the Director's Stock
      Account.

3.6   For purposes of this Plan, the value of each Phantom Share shall be
      computed to three decimal places.

3.7   Fees deferred in the form of cash (and the interest payable thereon)
      shall be held in the general assets of the Company and no separate fund
      or trust shall be created or moneys set aside on account of the Cash
      Account. Further, the Company shall not be required to acquire,
      reserve, segregate, or otherwise set aside shares of its Common Stock
      for the payment of its obligations, if any, with respect to the Stock
      Account, but shall make available as and when required a sufficient
      number of shares of its Common Stock to meet the needs of the Plan.

3.8   Nothing contained herein shall be deemed to create a trust of any kind
      or any fiduciary relationship. To the extent that any person acquires a
      right to receive payments from the Company under the Plan, such right
      shall be no greater than the right of any unsecured general creditor of
      the Company.

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3.9   The right to receive Common Stock at a later date shall not entitle any
      person to rights of a stockholder with respect to such Common Stock
      unless and until shares of Common Stock have been issued to such person
      pursuant to Article IV hereof.

                                   ARTICLE IV

                        PAYMENT OF DEFERRED COMPENSATION

4.1   Amounts contained in a Director's Cash Account and/or Stock Account
      shall be distributed as the Director's election (made pursuant to
      Section 2.2) shall provide. Amounts credited to a Director's Stock
      Account shall be paid, as the Director's election shall provide, in
      shares of Common Stock or in cash (in an amount equal to the product of
      (a) the number of full Phantom Shares reflected as being held in the
      Director's Stock Account and (b) the then Stock Value) to the Director
      upon distribution. If paid in Common Stock, a cash payment shall be
      made in respect of any fractional shares of Common Stock, with such
      cash payment being valued using the Stock Value on the date of
      settlement of the Director's Cash and Stock Accounts. Any share of
      Common Stock issued to a Director shall contain such restrictive
      legends limiting the transferability of such shares as the Company's
      counsel shall advise.

4.2   Each Director shall have the right to designate a beneficiary who is to
      succeed to his or her right to receive payments hereunder in the event
      of death. Any designated beneficiary shall receive payments in the same
      manner as the Director if he or she had lived. In case of a failure of
      designation or the death of a designated beneficiary without a
      designated successor, the balance of the amounts contained in the
      Director's Cash Account and/or Stock Account shall be paid, in
      accordance with Section 4.1, to the Director's or former Director's
      estate in full on the first day of the Year following the Year in which
      he or she dies. No designation of beneficiary or change in beneficiary
      shall be valid unless it is in writing signed by the Director and filed
      with the Secretary of the Company.

4.3   Notwithstanding the foregoing, in the event of a Change of Control, a
      Director shall become entitled to a full distribution of the Director's
      Cash Account and/or Stock Account, payable in a lump sum within 30 days
      following the Change in Control. In such event, with respect to the
      Director's Stock Account, the "Stock Value" shall mean the price per
      share paid in cash to, or the value of any consideration received by,
      each holder of the Common Stock in the transaction resulting in the
      Change of Control.

                                    ARTICLE V

                                 ADMINISTRATION

5.1   The Company shall administer the Plan at its expense. All decisions
      made by the Company with respect to issues hereunder shall be final and
      binding on all parties.

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5.2   Except to the extent required by law, the right of any Director or any
      beneficiary to any benefit or to any payment hereunder shall not be
      subject in any manner to attachment or other legal process for the
      debts of such Director or beneficiary, and any such benefit or payment
      shall not be subject to alienation, sale, transfer, assignment or
      encumbrance.

                                   ARTICLE VI

                                AMENDMENT OF PLAN

6.1   The Plan may be amended, suspended or terminated in whole or in part
      from time to time by the Board except that no amendment, suspension, or
      termination shall apply to the payment to any Director or beneficiary
      of a deceased Director of any amounts previously credited to a
      Director's Cash Account and/or Stock Account.

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                                   APPENDIX A

                                                       Date ____________________

------------------
Corporate Secretary
Alliance Imaging, Inc.
---------------------
-------------, ------------------

Dear Mr. ________________:

     Pursuant to the Alliance Imaging, Inc. Directors' Deferred Compensation
Plan, as amended to date (the "Plan"), I hereby elect to defer receipt of all or
a portion of the amounts I earn for serving as a member of the Board, including
any committees of the Board ("Fees") payable on or after [April __, 2000] and
for succeeding calendar years commencing January 1, 2001 in accordance with the
percentages indicated below.

     I elect to have my Fees credited as follows (fill in appropriate
percentages for options a, b and c, below):

     (a) ________% of the aggregate Fees shall be credited to my Cash Account as
defined in the Plan;

     (b) ________% of the aggregate Fees shall be credited to my Stock Account
as defined in the Plan;

     (c) ________% of the aggregate Fees shall not be deferred, but shall be
paid to me directly as they accrue.

     Further, I elect to receive the payments pursuant to the Plan (check method
desired, below):

     _______ in one lump sum

     _______ in ______ equal annual installments

     In addition, I elect to receive the payments of the balance credited to my
Stock Account (check method desired, below) in the form of:

     _______ cash

     _______ stock.

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     Lastly, I elect that my Cash Account and/or Stock Account shall become
payable [CHOOSE ONE OF THE FOLLOWING A. on the first day of January or as soon
thereafter as is practicable following my retirement or separation from the
Board, OR B. [insert any other payment schedule] and in any event in a lump sum
payment within 30 days after the occurrence of a Change in Control (as defined
in the Plan).

     In the event of my death prior to receipt of all or any balance of such
fees and interest or dividends thereon so accumulated, I designate
_________________________ as my beneficiary to receive the funds so accumulated.

                                                          Very truly yours,

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<PAGE>

         AMENDMENT NO. 1 TO DIRECTORS' DEFERRED COMPENSATION PLAN

This Amendment No. 1 modifies the Alliance Imaging, Inc. Directors' Deferred
Compensation Plan (the "Plan"). Terms not defined herein shall have the
meanings ascribed to them in the Plan.

The provisions of this Amendment shall become effective as of January 1, 2001
(the "Effective Date").

Section 1.16 of the Plan shall be replaced in its entirety and shall read as
follows:

1.16  "Stock Value" shall mean, per share, for any given day, (i) if the
Common Stock of the Company is not publicly traded, the fair market value as
reasonably determined in good faith by the officers of the Company, and (ii)
if the Common Stock of the Company is publicly traded, the closing price of
the Company's Common Stock as reported on the exchange upon which such Common
Stock is listed on such day or, if the closing price is not available for the
Common Stock on a date in question, then the next preceding practicable date
for which such closing price is available.

Except as provided for above, no other change, amendment or modification of
the Plan is hereby intended or implied.<PAGE>

                                                                   EXHIBIT 10.1

                                VOTING AGREEMENT

         VOTING AGREEMENT, dated as of July 1, 2001 (this "Agreement"), by and
between Mediaplex, Inc., a Delaware corporation (the "Company"), and the
undersigned stockholder ("Stockholder") of ValueClick, Inc., a Delaware
corporation ("Parent").

                                    RECITALS

         A.       Concurrently with the execution of this Agreement, Parent, the
Company and others are entering into an Agreement and Plan of Merger (the
"Merger Agreement"), pursuant to which Parent and the Company will effect a
business combination, upon the terms and subject to the conditions set forth in
the Merger Agreement (the "Merger"). Unless otherwise indicated, capitalized
terms not defined herein have the meanings given to them in the Merger
Agreement.

         B.       The Stockholder is a stockholder of Parent and has the voting
power with respect to such number of shares of the outstanding capital stock of
Parent as is indicated on the final page of this Agreement (collectively, the
"Shares").

         C.       As a material inducement to enter into the Merger Agreement
and to consummate the Merger, the Company desires the Stockholder to agree, and
the Stockholder is willing to agree to vote the Shares and any other such shares
of capital stock of acquired by Stockholder so as to facilitate consummation of
the Merger.

         NOW, THEREFORE, intending to be legally bound, the parties agree as
follows:

1.       VOTING OF SHARES.

         Section 1.1 VOTING AGREEMENT. Subject to the terms and conditions of
this Agreement, at every meeting of the stockholders of Parent called with
respect to any of the following, and at every adjournment or postponement
thereof, and on every action or approval by written consent of the stockholders
of Parent with respect to any of the following, Stockholder shall vote or cause
to be voted the Shares and any New Shares (as defined below) (a) in favor of (i)
adoption of the Merger Agreement, (ii) waiving any notice that may have been or
may be required relating thereto and (iii) any matter that could reasonably be
expected to facilitate the Merger and (b) against any matter that could
reasonably be expected to hinder, impede, prevent or delay the consummation of
the Merger. Stockholder shall not, from the date of this Agreement until the
Expiration Date (as hereinafter defined), enter into any agreement or
understanding with any Person to vote or give instructions inconsistent with
clause "(a)" or "(b)" of the preceding sentence.

         Section 1.2 NEW SHARES. Stockholder agrees that any shares of capital
stock of Parent that Stockholder purchases or with respect to which Stockholder
otherwise acquires beneficial ownership ("New Shares") after the execution of
this Agreement and prior to the Expiration Date (as defined below) shall be
subject to the terms and conditions of this Agreement to the same extent as if
they constituted Shares.

<PAGE>

         Section 1.3 PROXY.

         (a) Concurrently with the execution of this Agreement, Stockholder
shall deliver to the Company a proxy in the form attached hereto as EXHIBIT A,
which shall be irrevocable to the fullest extent permitted by law, with respect
to the shares referred to therein (the "Proxy").

         (b) After the execution of this Agreement until the Expiration Date (as
defined below), Stockholder shall execute or cause to be executed such further
proxies, each in substantially the form attached hereto as EXHIBIT A, as may be
requested by the Company with respect to any New Shares, and Stockholder shall
promptly notify the Company upon acquiring beneficial ownership of any New
Shares.

2.       TRANSFER OF SHARES.

         Section 2.1 NO DISPOSITION OR ENCUMBRANCE OF SHARES. Stockholder
covenants and agrees that, from the date of this Agreement until the Expiration
Date (as defined below), Stockholder will not, directly or indirectly: (a)
offer, sell, offer to sell, contract to sell, pledge, grant any option to
purchase or otherwise dispose of or transfer (or permit or announce any offer,
sale, offer of sale, contract of sale or grant of any option for the purchase
of, or permit or announce any other disposition or transfer of) any of the
Shares, or any interest in any of the Shares, to any Person other than the
Company; (b) create or permit to exist any liens, claims, options, charges or
other encumbrances on or otherwise affecting any of the Shares; or (c) reduce
Stockholder's beneficial ownership of, interest in or risk relating to any of
the Shares; PROVIDED, that nothing herein shall prohibit transfers of Shares to
an affiliate, related party, family member or trust established for the benefit
of the Stockholder or any of the foregoing persons or entities, provided that
the recipient of such Shares shall agree in writing to be bound by the
provisions of this Agreement.

         Section 2.2 TRANSFER OF VOTING RIGHTS. Stockholder covenants and agrees
that, from the date of this Agreement until the Expiration Date (as defined
below), Stockholder will not deposit any of the Shares into a voting trust or
grant a proxy or enter into a voting agreement or similar contract with respect
to any of the Shares.

3.       WAIVER OF APPRAISAL RIGHTS. Stockholder hereby irrevocably and
unconditionally waives any rights of appraisal, dissenters' rights or similar
rights that Stockholder may have in connection with the Merger.

4.       REPRESENTATIONS AND WARRANTIES OF THE STOCKHOLDER.

         Section 4.1 OWNERSHIP OF SHARES. Stockholder represents and warrants
that Stockholder (a) is the record or beneficial owner of and has the sole right
to vote or direct the voting of the Shares, which at the date hereof are free
and clear of any liens, claims, options, charges or other encumbrances and (b)
does not own, either beneficially or of record, any shares of capital stock of
Parent other than the Shares (excluding (i) shares as to which Stockholder
currently disclaims beneficial ownership in accordance with applicable law and
(ii) shares which Stockholder has the right to acquire pursuant to options
granted to Stockholder by Parent).

         Section 4.2 NO CONFLICT. The execution and delivery of this Agreement
and the Proxy by Stockholder do not, and the performance of this Agreement and
the Proxy by Stockholder will not: (a) conflict with or violate any legal
requirement, order, decree or judgment applicable to Stockholder or by which
Stockholder or any of Stockholder's properties is bound or affected; or (b)

                                       2
<PAGE>

result in any breach of or constitute a default (with notice or lapse of time,
or both) under, or give to others any rights of termination, amendment,
acceleration or cancellation of, or result in the creation of an encumbrance on
or otherwise affecting any of the Shares pursuant to, any contract to which
Stockholder is a party or by which Stockholder or any of Stockholder's
properties is bound or affected. The execution and delivery of this Agreement
and the Proxy by Stockholder do not, and the performance of his obligations
under this Agreement and the granting of the Proxy by Stockholder will not,
require any consent of any Person.

         Section 4.3 ENFORCEABILITY. Stockholder has all requisite power and
capacity to execute and deliver this Agreement and the Proxy and to perform his
obligations hereunder and thereunder. This Agreement and the Proxy have been
duly executed and delivered by Stockholder and, assuming the due authorization,
execution and delivery of this Agreement by the Company, each constitute the
legal, valid and binding obligations of Stockholder, enforceable against
Stockholder in accordance with their respective terms, subject to (a) laws of
general application relating to bankruptcy, insolvency and the relief of
debtors, and (b) rules of law governing specific performance, injunctive relief
and other equitable remedies.

         Section 4.4 CONTINUOUS WARRANTY. The representations and warranties
contained in this Agreement are accurate in all respects as of the date of this
Agreement, will be accurate in all material respects at all times through the
Expiration Date (as defined below) and will be accurate in all material respects
as of the date of the consummation of the Merger as if made on that date.

5.       COVENANTS OF STOCKHOLDER. Stockholder hereby covenants and agrees to
cooperate fully with the Company and to execute and deliver any additional
documents necessary or desirable and to take such further actions, in the
reasonable opinion of the Company, necessary or desirable to carry out the
intent of this Agreement.

6.       TERMINATION. This Agreement shall terminate and shall have no further
force or effect on the earliest of (i) the termination of the Merger Agreement
in accordance with its terms, (ii) the Effective Time and (iii) November 30,
2001 (the "Expiration Date").

7.       NO RESTRAINT ON OFFICER OR DIRECTOR ACTION. This Agreement is intended
to bind Stockholder solely in his capacity as a stockholder of Parent and only
with respect to the specific matters set forth herein, and shall not prohibit
Stockholder from acting in accordance with his fiduciary duties as an officer or
director of Parent, if applicable.

8.       LIMITED PROXY. Stockholder will retain at all times the right to vote
Stockholder's Shares, in Stockholder's sole discretion, on all matters other
than those set forth in Section 1.1 which are at any time or from time to time
presented to Parent's stockholders generally.

9.       MISCELLANEOUS.

         Section 9.1 FEES AND EXPENSES. Except as specifically provided to the
contrary in this Agreement, all costs and expenses incurred in connection with
this Agreement shall be paid by the party incurring such expenses.

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<PAGE>

         Section 9.2 AMENDMENTS AND MODIFICATION. Subject to applicable law,
this Agreement may not be amended, modified, or supplemented except upon the
execution and delivery of a written agreement executed by the parties hereto.

         Section 9.3 NONSURVIVAL OF REPRESENTATIONS AND WARRANTIES. None of the
representations and warranties in this Agreement or in any schedule, instrument
or other document delivered pursuant to this Agreement shall survive the
Expiration Date; PROVIDED, HOWEVER that the termination of this Agreement shall
not relieve any party from any liability for any breach of this Agreement.

         Section 9.4 NOTICES. All notices and other communications hereunder
shall be in writing and shall be deemed given if delivered personally,
telecopied (which is confirmed) or sent by an internationally recognized
overnight courier service, such as Federal Express, to the parties at the
following addresses (or at such other address for a party as shall be specified
by like notice):

                         if to the Company to:

                         Mediaplex, Inc.
                         177 Steuart Street, Suite 200
                         San Francisco, California 94105
                         Attention: Tom A. Vadnais
                         Telecopy No.: (415) 808-1999

                         with a copy (which shall not constitute notice) to:

                         Wilson Sonsini Goodrich & Rosati
                         One Market, Spear Tower
                         San Francisco, California 94105
                         Attention: Michael J. Kennedy
                         Telecopy No.: (415) 947-2099

                         and

                         if to Stockholder, to the address for notice set forth
                         on the last page hereof.

                         with a copy (which shall not constitute notice) to:

                         Brobeck, Phleger & Harrison LLP
                         550 South Hope Street
                         Los Angeles, California 90071
                         Attention: Kenneth R. Bender
                         Telecopy No.: (213) 745-3345

         Section 9.5 COUNTERPARTS. This Agreement may be executed in one or more
counterparts (whether delivered by facsimile or otherwise), each of which shall
be considered one and the same agreement.

                                       4
<PAGE>

         Section 9.6 ENTIRE AGREEMENT; NO THIRD PARTY BENEFICIARIES. This
Agreement (including the documents and the instruments referred to herein): (a)
constitute the entire agreement and supersede all prior agreements,
negotiations, arrangements and understandings, both written and oral, among the
parties with respect to the subject matter hereof, and (b) are not intended to
confer upon any person other than the Company and Stockholder any rights or
remedies hereunder.

         Section 9.7 SEVERABILITY. Any term or provision of this Agreement that
is held by a court of competent jurisdiction or other authority to be invalid,
void or unenforceable in any situation in any jurisdiction shall not affect the
validity or enforceability of the remaining terms and provisions hereof or the
validity or enforceability of the invalid, void or unenforceable term or
provision in any other situation or in any other jurisdiction. If the final
judgment of a court of competent jurisdiction or other authority declares that
any term or provision hereof is invalid, void or unenforceable, the parties
agree that the court making such determination shall have the power to and
shall, subject to the discretion of such court, reduce the scope, duration, area
or applicability of the term or provision, to delete specific words or phrases,
or to replace any invalid, void or unenforceable term or provision with a term
or provision that is valid and enforceable and that comes closest to expressing
the intention of the invalid or unenforceable term or provision.

         Section 9.8 GOVERNING LAW. This Agreement shall be governed by and
construed in accordance with the laws of the State of Delaware without
application of conflicts of laws principles.

         Section 9.9 ENFORCEMENT. The parties agree that irreparable damage
would occur in the event that any of the provisions of this Agreement were not
performed in accordance with their specific terms or were otherwise breached. It
is accordingly agreed that the parties shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement and to enforce specifically
the terms and provisions of this Agreement in any court of the United States
sitting in Delaware or the state of Delaware, this being in addition to any
other remedy to which they are entitled at law or in equity. THE COMPANY AND
STOCKHOLDER EACH IRREVOCABLY AND UNCONDITIONALLY WAIVE ANY RIGHT THEY MAY HAVE
TO TRIAL BY JURY IN CONNECTION WITH THIS AGREEMENT, THE PROXY OR THE
TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY.

         Section 9.10 EXTENSION, WAIVER. At any time prior to the Expiration
Date, the parties to this Agreement may (a) extend the time for the performance
of any of the obligations or other acts of the other parties to this Agreement,
(b) waive any inaccuracies in the representations and warranties of the other
parties contained in this Agreement or in any document delivered pursuant to
this Agreement or (c) waive compliance by the other parties with any of the
agreements or conditions contained in this Agreement. Any agreement on the part
of a party to any such extension or waiver shall be valid only if set forth in
an instrument in writing signed on behalf of such party. The failure of any
party to this Agreement to assert any of its rights under this Agreement or
otherwise shall not constitute a waiver of those rights.

         Section 9.11 ASSIGNMENT. Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned by any of the parties to
this Agreement (whether by operation of law or otherwise) without the prior
written consent of the other parties to this Agreement. Subject to the preceding
sentence, this Agreement will be binding upon, inure to the benefit of and be
enforceable by the parties and their respective successors and assigns. Without

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<PAGE>

limiting any of the restrictions set forth in Section 2 or elsewhere in this
Agreement, this Agreement shall be binding upon any person to whom any Shares
are transferred.

         Section 9.12 LEGAL COUNSEL. Stockholder acknowledges that he has been
advised to, and has had the opportunity to consult with his or its personal
attorney prior to entering into this Agreement. Stockholder acknowledges that
attorneys for Parent represent Parent and do not represent any of the
stockholders of Parent in connection with the Merger Agreement, this Agreement
or any of the transactions contemplated hereby or thereby.

         Section 9.13 AGREEMENT NEGOTIATED. The form of this Agreement has been
negotiated by or on behalf of Parent and the Company, each of which was
represented by attorneys who have carefully negotiated the provisions hereof. No
law or rule relating to the construction or interpretation of contracts against
the drafter of any particular clause should be applied with respect to this
Agreement or the Proxy.

         Section 9.14 EFFECT OF HEADINGS. The Section headings herein are for
convenience only and shall not affect the construction or interpretation of this
Agreement.

         Section 9.15 LEGENDS. Any stock certificates representing the Shares or
the New Shares shall be legended at the request of the Company to reflect the
voting agreement and, if applicable, the irrevocable proxy granted by this
Agreement.

                                       6
<PAGE>

         IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed on the date and year first above written.

         MEDIAPLEX, INC.

         By:
                 ------------------------------------------------------------
         Name:
                 ------------------------------------------------------------
         Title:
                 ------------------------------------------------------------
         STOCKHOLDER
         By:
                 ------------------------------------------------------------
         Name:
                 ------------------------------------------------------------
         Title:
                 ------------------------------------------------------------
         Number of Shares of ValueClick, Inc. Beneficially Owned by Stockholder:

         Common Stock:
                       -------------------------------------------------------

                                       7
<PAGE>

                                    EXHIBIT A

                                IRREVOCABLE PROXY

         The undersigned stockholder of ValueClick, Inc., a Delaware corporation
("Parent"), hereby irrevocably appoints and constitutes
__________________________, of Mediaplex, Inc., a Delaware corporation (the
"Company"), and each of them, or any other designee of the Company, as the sole
and exclusive attorneys and proxies of the undersigned, with full power of
substitution and resubstitution, to the full extent of the undersigned's rights
with respect to the shares of capital stock of Parent beneficially owned by the
undersigned, which shares are listed on the final page of this irrevocable proxy
(the "Irrevocable Proxy") and any and all other shares or securities issued or
issuable in respect thereof (collectively, the "Shares"), until the earliest to
occur of (i) the termination of the Merger Agreement (as defined below) in
accordance with its terms, (ii) the Effective Time and (iii) November 30, 2001
(the "Expiration Date"). Upon the undersigned's execution of this Irrevocable
Proxy, any and all prior proxies given by the undersigned with respect to any
Shares are hereby revoked and the undersigned agrees not to grant any subsequent
proxies with respect to the Shares until after the Expiration Date.

         This Irrevocable Proxy is irrevocable (to the fullest extent provided
by applicable law), is coupled with an interest, is granted pursuant to the
Voting Agreement, dated as of June ___, 2001, by and between the Company and the
undersigned Stockholder (the "Voting Agreement"), and is granted in
consideration of the Company (a) entering into the Agreement and Plan of Merger,
dated as of June , 2001 (the "Merger Agreement"), by and among Parent, the
Company and others and (b) consummating the Merger. Capitalized terms used but
not otherwise defined in this proxy have the meanings given to such terms in the
Merger Agreement.

         The attorneys and proxies named above, and each of them, are hereby
authorized and empowered to by the undersigned at any time prior to the
Expiration Date to act as the undersigned's attorney and proxy to vote the
Shares and to exercise all voting and other rights of the undersigned with
respect to the Shares (including, without limitation, the power to execute and
deliver written consents with respect to the Shares pursuant to the General
Corporation Law of the State of Delaware) at every annual, special or adjourned
meeting of the stockholders of Parent, and in every written consent in lieu of
such a meeting, or otherwise, (a) in favor of (i) adoption of the Merger
Agreement, (ii) waiving any notice that may have been or may be required
relating thereto and (iii) any matter that could reasonably be expected to
facilitate the Merger and (b) against any matter that could reasonably be
expected to hinder, impede, prevent or delay the consummation of the Merger.

         The attorneys and proxies named above may not exercise this Irrevocable
Proxy on any other matter except as provided above. The undersigned Stockholder
may vote the Shares on all such other matters.

                                       8
<PAGE>

         All authority herein conferred shall survive the death or incapacity of
the undersigned and any obligation of the undersigned hereunder shall be binding
upon the heirs, personal representatives, successors and assigns of the
undersigned. THIS PROXY IS IRREVOCABLE.

                    Signature of Stockholder:
                                                --------------------------------
                    Print Name of Stockholder:
                                                --------------------------------

                  _____  Shares beneficially owned

                                       9

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