Document:

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                                                                   EXHIBIT 10.13

                                     FORM OF
                             STOCK ESCROW AGREEMENT

      STOCK ESCROW AGREEMENT, dated as of _______________ __, 2006
("Agreement"), by and among NAVITAS INTERNATIONAL CORPORATION, a Delaware
corporation ("Company"), VIVEK K. SONI, PARAG G. MEHTA, HEMANG DAVE, N.L. JAIN,
S.P. KOTHARI, MICHAEL D. MARVIN, GAURAV GUPTA, SERVJEET S. BHACHU, G.N. BAJPAI,
JULIO E. VEGA (collectively "Initial Stockholders") and CONTINENTAL STOCK
TRANSFER & TRUST COMPANY, a New York corporation ("Escrow Agent").

      WHEREAS, the Company has entered into an Underwriting Agreement, dated
________ __, 2006 ("Underwriting Agreement"), with FTN Midwest Securities Corp.,
as representative of the underwriters listed on Schedule I thereto
("Representative"), pursuant to which, among other matters, the Representative
and the underwriters have agreed, severally and not jointly, to purchase
20,000,000 units ("Units") of the Company, and up to an additional 3,000,000
Units pursuant to an over-allotment option. Each Unit consists of one share of
the Company's Common Stock, par value $.0001 per share, and two Warrants, each
Warrant to purchase one share of Common Stock, all as more fully described in
the Company's final Prospectus, dated __________ __, 2006 ("Prospectus")
comprising part of the Company's Registration Statement on Form S-1 (File No.
333-130697) as filed with the Securities and Exchange Commission pursuant to the
Securities Act of 1933, as amended ("Registration Statement"), declared
effective on ___________ __, 2006 ("Effective Date").

      WHEREAS, the Initial Stockholders have agreed as a condition of the
Underwriters' (as such term is defined in the Underwriting Agreement) obligation
to purchase the Units, to deposit all of their shares of Common Stock of the
Company, as set forth opposite their respective names in Exhibit A attached
hereto (collectively "Escrow Shares"), in escrow as hereinafter provided.

      WHEREAS, the Company and the Initial Stockholders desire that the Escrow
Agent accept the Escrow Shares, in escrow, to be held and disbursed as
hereinafter provided.

      IT IS AGREED:

      1. Appointment of Escrow Agent. The Company and the Initial Stockholders
hereby appoint the Escrow Agent to act in accordance with and subject to the
terms of this Agreement and the Escrow Agent hereby accepts such appointment and
agrees to act in accordance with and subject to such terms.

      2. Deposit of Escrow Shares. On or before the Effective Date, each of the
Initial Stockholders shall deliver to the Escrow Agent certificates representing
his respective Escrow Shares, to be held and disbursed subject to the terms and
conditions of this Agreement. Each Initial Stockholder acknowledges that the
certificate representing his Escrow Shares is legended to reflect the deposit of
such Escrow Shares under this Agreement.

      3. Disbursement of the Escrow Shares. The Escrow Agent shall hold the
Escrow Shares until the completion of a business combination as more fully
described in the Prospectus (the "Business Combination"), whereby one-quarter of
the Escrow Shares of each Initial Stockholder will be released from escrow
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six months after the completion of the Business Combination and one quarter of
such Escrow Shares will be released every six months thereafter, so that the
final one-quarter of the Escrow Shares of each Initial Stockholder will be
released upon the second anniversary of the completion of the Business
Combination (the "Escrow Period"). On each such date, the Escrow Agent shall,
upon written instructions from each Initial Stockholder, disburse each of the
Initial Stockholder's Escrow Shares to such Initial Stockholder; provided,
however, that in the event that the Closing Time (as defined in the Underwriting
Agreement) does not occur, then the Escrow Agent shall promptly release the
Escrow Shares to the Initial Stockholders; provided further, however, that if
the Escrow Agent is notified by the Company pursuant to Section 6.7 hereof that
the Company is being liquidated at any time during the Escrow Period, then the
Escrow Agent shall promptly destroy the certificates representing the Escrow
Shares; provided further, however, that if, after the Company consummates a
Business Combination and the Company or the surviving entity of such Business
Combination subsequently consummates a liquidation, merger, stock exchange or
other similar transaction which results in all of the stockholders of the
Company or such entity having the right to exchange their shares of Common Stock
for cash, securities or other property, then the Escrow Agent will, upon receipt
of a certificate, executed by the Chief Executive Officer or Vice-President,
Finance of the Company, in form reasonably acceptable to the Escrow Agent, that
such transaction is then being consummated, release the Escrow Shares to the
Initial Stockholders upon consummation of the transaction so that they can
similarly participate. The Escrow Agent shall have no further duties hereunder
after the disbursement or destruction of the Escrow Shares in accordance with
this Section 3.

      4. Rights of Initial Stockholders in Escrow Shares.

            4.1. Voting Rights as a Stockholder. Subject to the terms of the
      Insider Letter described in Section 4.4 hereof and except as herein
      provided, the Initial Stockholders shall retain all of their rights as
      stockholders of the Company during the Escrow Period, including, without
      limitation, the right to vote such shares.

            4.2. Dividends and Other Distributions in Respect of the Escrow
      Shares. During the Escrow Period, all dividends payable in cash with
      respect to the Escrow Shares shall be paid to the Initial Stockholders,
      but all dividends payable in stock or other non-cash property ("Non-Cash
      Dividends") shall be delivered to the Escrow Agent to hold in accordance
      with the terms hereof. As used herein, the term "Escrow Shares" shall be
      deemed to include the Non-Cash Dividends distributed thereon, if any.

            4.3. Restrictions on Transfer. During the Escrow Period, no sale,
      transfer or other disposition may be made of any or all of the Escrow
      Shares except (i) by gift to a member of Initial Stockholder's immediate
      family or to a trust, the beneficiary of which is an Initial Stockholder
      or a member of an Initial Stockholder's immediate family, (ii) by virtue
      of the laws of descent and distribution upon death of any Initial
      Stockholder, or (iii) pursuant to a qualified domestic relations order;
      provided, however, that such permissive transfers may be implemented only
      upon the respective transferee's written agreement to be bound by the
      terms and conditions of this Agreement and of the Insider Letter signed by
      the Initial Stockholder transferring the Escrow Shares. During the Escrow
      Period, the Initial Stockholders shall not pledge or grant a security
      interest in the Escrow Shares or grant a security interest in their rights
      under this Agreement.

            4.4. Insider Letters. Each of the Initial Stockholders has executed
      a letter agreement with the Company dated as indicated on Exhibit A
      hereto, and which is filed as an exhibit to the Registration Statement
      ("Insider Letter"), respecting the rights and obligations of such Initial
      Stockholder in certain events, including but not limited to the
      liquidation of the Company.

                                       2
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      5. Concerning the Escrow Agent.

            5.1. Good Faith Reliance. The Escrow Agent shall not be liable for
      any action taken or omitted by it in good faith and in the exercise of its
      own best judgment, and may rely conclusively and shall be protected in
      acting upon any order, notice, demand, certificate, opinion or advice of
      counsel (including counsel chosen by the Escrow Agent), statement,
      instrument, report or other paper or document (not only as to its due
      execution and the validity and effectiveness of its provisions, but also
      as to the truth and acceptability of any information therein contained)
      which is believed by the Escrow Agent to be genuine and to be signed or
      presented by the proper person or persons. The Escrow Agent shall not be
      bound by any notice or demand, or any waiver, modification, termination or
      rescission of this Agreement unless evidenced by a writing delivered to
      the Escrow Agent signed by the proper party or parties and, if the duties
      or rights of the Escrow Agent are affected, unless it shall have given its
      prior written consent thereto.

            5.2. Indemnification. The Escrow Agent shall be indemnified and held
      harmless by the Company from and against any expenses, including counsel
      fees and disbursements, or loss suffered by the Escrow Agent in connection
      with any action, suit or other proceeding involving any claim which in any
      way, directly or indirectly, arises out of or relates to this Agreement,
      the services of the Escrow Agent hereunder, or the Escrow Shares held by
      it hereunder, other than expenses or losses arising from the gross
      negligence or willful misconduct of the Escrow Agent. Promptly after the
      receipt by the Escrow Agent of notice of any demand or claim or the
      commencement of any action, suit or proceeding, the Escrow Agent shall
      notify the other parties hereto in writing. In the event of the receipt of
      such notice, the Escrow Agent, in its sole discretion, may commence an
      action in the nature of interpleader in an appropriate court to determine
      ownership or disposition of the Escrow Shares or it may deposit the Escrow
      Shares with the clerk of any appropriate court or it may retain the Escrow
      Shares pending receipt of a final, non-appealable order of a court having
      jurisdiction over all of the parties hereto directing to whom and under
      what circumstances the Escrow Shares are to be disbursed and delivered.
      The provisions of Sections 5.2 and 5.7 shall survive in the event the
      Escrow Agent resigns or is discharged pursuant to Sections 5.5 or 5.6
      below.

            5.3. Compensation. The Escrow Agent shall be entitled to reasonable
      compensation from the Company for all services rendered by it hereunder.

            5.4. Further Assurances. From time to time on and after the date
      hereof, the Company and the Initial Stockholders shall deliver or cause to
      be delivered to the Escrow Agent such further documents and instruments
      and shall do or cause to be done such further acts as the Escrow Agent
      shall reasonably request to carry out more effectively the provisions and
      purposes of this Agreement, to evidence compliance herewith or to assure
      itself that it is protected in acting hereunder.

            5.5. Resignation. The Escrow Agent may resign at any time and be
      discharged from its duties as escrow agent hereunder by its giving the
      other parties hereto written notice and such resignation shall become
      effective as hereinafter provided. Such resignation shall become effective
      at such time that the Escrow Agent shall turn over to a successor escrow
      agent appointed by the Company upon consent by the Representative with
      such consent not to be unreasonably withheld, the Escrow Shares held
      hereunder. If no new escrow agent is so appointed within the sixty (60)
      day period following the giving of such notice of resignation, the Escrow
      Agent may deposit the Escrow Shares with any court it reasonably deems
      appropriate.

                                       3
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            5.6. Discharge of Escrow Agent. The Escrow Agent shall resign and be
      discharged from its duties as escrow agent hereunder if so requested in
      writing at any time by the Company and a majority of the Initial
      Stockholders, jointly, provided, however, that such resignation shall
      become effective only upon acceptance of appointment by a successor escrow
      agent as provided in Section 5.5.

            5.7. Liability. Notwithstanding anything herein to the contrary, the
      Escrow Agent shall not be relieved from liability hereunder for its own
      gross negligence or its own willful misconduct.

            5.8. Trust Fund Waiver. The Escrow Agent has no right, title,
      interest, or claim of any kind ("Claim") in or to any monies in the Trust
      Account (as defined in that certain Investment Management Trust Agreement,
      dated as of the date hereof, by and between the Company and Continental
      Stock Transfer & Trust Company, as trustee of the Trust Account), and
      hereby waives any Claim it may have in the future in or to any monies in
      the Trust Account, and hereby agrees not to seek recourse, reimbursement,
      payment or satisfaction for any Claim against the Trust Account for any
      reason whatsoever.

      6. Miscellaneous.

            6.1. Governing Law. This Agreement shall for all purposes be deemed
      to be made under and shall be construed in accordance with the laws of the
      State of New York. Each of the parties hereby agrees that any action,
      proceeding or claim against it arising out of or relating in any way to
      this Agreement shall be brought and enforced in the courts of the State of
      New York or the United States District Court for the Southern District of
      New York (each, a "New York Court"), and irrevocably submits to such
      jurisdiction, which jurisdiction shall be exclusive. Each of the parties
      hereby waives any objection to such exclusive jurisdiction and that such
      courts represent an inconvenient forum. Each of N.L. Jain and G.N. Bajpai
      (the "Non-U.S. Stockholders") has appointed Servjeet S. Bhachu, in his
      capacity as General Counsel and Vice President of the Company, as their
      authorized agent (the "Authorized Agent") upon whom process may be served
      in any such action arising out of or based on this Agreement or the
      transactions contemplated hereby which may be instituted in any New York
      Court. Such appointment shall be irrevocable. The Company and the Non-U.S.
      Stockholders represent and warrant that the Authorized Agent has agreed to
      act as such agent for service of process and agrees to take any and all
      action, including the filing of any and all documents and instruments that
      may be necessary to continue such appointment in full force and effect as
      aforesaid. Service of process upon the Authorized Agent and written notice
      of such service to the Company shall be deemed, in every respect,
      effective service of process upon the respective Non-U.S. Stockholder.

            6.2. Amendment. Each of the Initial Stockholders hereby acknowledges
      that this Agreement may not be amended, changed, waived, altered or
      modified without the prior written consent of the Representative, which
      consent shall not be unreasonably withheld.

            6.3. Entire Agreement. This Agreement contains the entire agreement
      of the parties hereto with respect to the subject matter hereof and,
      except as expressly provided herein, may not be changed or modified except
      by an instrument in writing signed by the party to be charged.

            6.4. Headings. The headings contained in this Agreement are for
      reference purposes only and shall not affect in any way the meaning or
      interpretation thereof.

                                       4
<PAGE>
            6.5. Binding Effect. This Agreement shall be binding upon and inure
      to the benefit of the respective parties hereto and their legal
      representatives, successors and assigns.

            6.6. Notices. Any notice or other communication required or which
      may be given hereunder shall be in writing and either be delivered
      personally, by private national courier service, or be mailed, certified
      or registered mail, return receipt requested, postage prepaid, and shall
      be deemed given when so delivered personally or, if sent by private
      national courier service, on the next business day after delivery to the
      courier, or if mailed, two business days after the date of mailing, as
      follows:

            If to the Company, to

                Navitas International Corporation
                4 Dublin Circle
                Burlington, MA  01803
                Attn:  Servjeet S. Bhachu, General Counsel

            If to an Initial Stockholder, to his address set forth in Exhibit A.

            and if to the Escrow Agent, to:

                Continental Stock Transfer & Trust Company
                17 Battery Place
                New York, NY  10004
                Attn:  Chairman

            A copy of any notice sent hereunder shall be sent to:

                Bingham McCutchen LLP
                150 Federal Street
                Boston, MA  02110
                Attn:  Julio E. Vega, Esq.

            and:

                FTN Midwest Securities Corp.
                350 Madison Avenue
                New York, NY  10036
                Attn:  Corporate Syndicate Department

            and:

                Kelley Drye & Warren LLP
                Two Stamford Plaza
                281 Tresser Boulevard
                Stamford, CT  06901
                Attn:  Randi-Jean G. Hedin, Esq.

            The parties may change the persons and addresses to which the
      notices or other communications are to be sent by giving written notice to
      any such change in the manner provided herein for giving notice.

                                       5
<PAGE>
            6.7. Liquidation of Company. The Company shall give the Escrow Agent
      written notification of the liquidation and dissolution of the Company in
      the event that the Company fails to consummate a Business Combination
      within the time period(s) specified in the Prospectus.

                  [Remainder of Page Intentionally Left Blank]

                                       6
<PAGE>
WITNESS the execution of this Stock Escrow Agreement as of the date first above
written:

                               NAVITAS INTERNATIONAL CORPORATION

                               By:
                                    --------------------------------------------
                                      Parag G. Mehta
                                      President and Chief Executive Officer

                               CONTINENTAL STOCK TRANSFER & TRUST
                               COMPANY

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

                               INITIAL STOCKHOLDERS:

                               -------------------------------------------------
                               Vivek K. Soni

                               -------------------------------------------------
                               Parag G. Mehta

                               -------------------------------------------------
                               Hemang Dave

                               -------------------------------------------------
                               N.L. Jain

                               -------------------------------------------------
                               S.P. Kothari

                                       7
<PAGE>
                               -------------------------------------------------
                               Michael D. Marvin

                               -------------------------------------------------
                               Gaurav Gupta

                               -------------------------------------------------
                               Servjeet S. Bhachu

                               -------------------------------------------------
                               G.N. Bajpai

                               -------------------------------------------------
                               Julio E. Vega

                                       8
<PAGE>
                                                                       EXHIBIT A

<Table>
<Caption>
NAME & ADDRESS OF                           STOCK CERTIFICATE    DATE OF INSIDER
INITIAL STOCKHOLDER    NUMBER OF SHARES         NUMBER                LETTER
<S>                    <C>                  <C>                <C>
Vivek K. Soni            1,208,333                             __________, 2006
One Charing Cross
Lynnfield, MA 01940

Parag G. Mehta           1,208,333                             __________, 2006
4 Dublin Circle
Burlington, MA 01803

Hemang Dave                250,000                             __________, 2006
52 Waltham Street
Lexington, MA 02421

N.L. Jain                  250,000                             __________, 2006
4 Dublin Circle
Burlington, MA 01803

S.P. Kothari               250,000                             __________, 2006
11 Walnut Street
Lexington, MA 02421

Michael D. Marvin          250,000                             __________, 2006
Chairman Emeritus
c/o MapInfo Corp.
One Global View
Troy, NY 12180

Gaurav Gupta               604,167                             __________, 2006
16 Ernst Road, Apt. 3
Arlington, MA 02474

Servjeet S. Bhachu         604,167                             __________, 2006
4 Regent Road
Belmont, MA 02478

G.N. Bajpai                250,000                             __________, 2006
4 Dublin Circle
Burlington, MA 01803

Julio E. Vega              125,000                             __________, 2006
150 Federal Street
Boston, MA 02110
</Table>

                                       9exv4w1

 

EXHIBIT 4.1

	MEMBERSHIP UNIT CERTIFICATE
NEK-SEN ENERGY, LLC
A LIMITED LIABILITY COMPANY ORGANIZED UNDER THE LAWS OF THE STATE OF KANSAS

	Number            Membership            Units

	THIS CERTIFIES THAT is the owner of Membership Units of NEK-SEN ENERGY, LLC, an Kansas limited
liability company. Changes in the actual Membership Units held by the Members are reflected in the
Certificate Register of the Company.

	The Membership Units represented by this Certificate may not be sold, transferred, encumbered or
assigned except in compliance with the legend appearing on the back side hereof and the Operating
Agreement of the Company, as it may be amended from time to time, a copy of which is available at
the principal office of the Company. Any sale, transfer, encumbrance or assignment in violation of
such Operating Agreement is null and void and may be enjoined.

	IN WITNESS WHEREOF, the Company has caused this Certificate to be signed by its duly authorized
Chairperson and Secretary as of the day of , 20 .

	Chairperson Secretary

 

     FOR VALUE RECEIVED,           hereby sell, assign, and transfer unto   
                    
                 
      
               
                   
 Units represented
by the within Certificate, and do hereby irrevocably constitute and appoint      
              
    
                 Attorney to transfer
the said Units on the books of the within named Company with full power of substitution in the
premises.

     Dated                                         ,           .

In Presence of

	 	 	 
	        
                   
                   
                 

	 	 
	 
	 	 
	 

	 	              
                    
                    
           
                   
                
	 
	 	 
	 

	 	            
                
                  
                
                 
               
      

	 	 	 	 	 
	 

	 	THE MEMBERSHIP INTEREST (UNITS) OF THE COMPANY REPRESENTED BY THIS INSTRUMENT HAS
NOT BEEN REGISTERED UNDER ANY SECURITIES LAW AND THE TRANSFERABILITY OF SUCH
MEMBERSHIP INTEREST (UNITS) IS RESTRICTED. SUCH MEMBERSHIP INTEREST (UNITS) MAY
NOT BE SOLD, OFFERED FOR SALE, ASSIGNED OR TRANSFERRED, NOR WILL ANY ASSIGNEE,
VENDEE, TRANSFEREE OR ENDORSEE THEREOF BE RECOGNIZED AS HAVING ACQUIRED ANY SUCH
MEMBERSHIP INTEREST (UNITS) BY THE ISSUER FOR ANY PURPOSES, UNLESS (I) A
REGISTRATION UNDER THE SECURITIES ACT OF 1933 (AS AMENDED) WITH RESPECT TO SUCH
MEMBERSHIP INTEREST (UNITS) SHALL THEN BE IN EFFECT AND SUCH TRANSFER HAS BEEN
QUALIFIED UNDER APPLICABLE STATE SECURITIES LAWS, OR (II) THE AVAILABILITY OF AN
EXEMPTION FROM SUCH REGISTRATION AND QUALIFICATION SHALL BE ESTABLISHED TO THE
SATISFACTION OF COUNSEL TO THE COMPANY.
	 	 
	 
	 	 	 	 
	 

	 	ADDITIONALLY, NO MEMBERSHIP INTEREST (UNITS) REPRESENTED BY THIS INSTRUMENT MAY BE
SOLD, ASSIGNED, PLEDGED, GIFTED, BEQUEATHED OR OTHERWISE TRANSFERRED EXCEPT AS
PROVIDED IN THE OPERATING AGREEMENT OF THE COMPANY. COPIES OF THE OPERATING
AGREEMENT ARE AVAILABLE FOR INSPECTION AT THE PRINCIPAL OFFICE OF THE COMPANY.

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