Document:

<PAGE>   1
                                                                   Exhibit 10.24

                          AMENDMENT TO PROMISSORY NOTE

     This Amendment to Promissory Note dated April 10, 2000 by and between
Dynacs Inc. (formerly known as Dynacs Engineering Co., Inc.) (the "Company") and
Peter Likins (the "Payee").

     Reference is made to that certain promissory note dated June 10, 1999 by
and between the Company and Payee in the principal amount equal to $400,000
bearing interest at the rate of 12.0% (the "Promissory Note").

     The parties agree that the maturity date of the Promissory Note shall be
extended to October 10, 2000.

     All other terms and conditions of the Promissory Note shall remain in full
force and effect.

                                             DYNACS INC.

                                             By: /s/ Ramendra P. Singh
                                                 -------------------------
                                                   Ramendra P. Singh
                                                   President and
                                                   Chief Executive Officer

Accepted and Agreed to:

/s/ Peter Likins
------------------------------
Peter Likins<PAGE>   1
                                                                   Exhibit 10.25

                          AMENDMENT TO PROMISSORY NOTE

         This Amendment to Promissory Note dated April 10, 2000 by and between
Dynacs Inc. (formerly known as Dynacs Engineering Co., Inc.) (the "Company") and
Robert Skelton (the "Payee").

         Reference is made to that certain promissory note dated June 10, 1999
by and between the Company and Payee in the principal amount equal to $200,000
bearing interest at the rate of 12.0% per annum (the "Promissory Note").

         The parties agree that the maturity date of the Promissory Note shall
be extended to October 10, 2000.

         All other terms and conditions of the Promissory Note shall remain in
full force and effect.

                                        DYNACS INC.

                                        By: /s/ Ramendra P. Singh
                                           -------------------------------
                                              Ramendra P. Singh
                                              President and
                                              Chief Executive Officer

Accepted and Agreed to:

/s/ Robert Skelton
----------------------------
Robert Skelton<PAGE>   1
                                                                   Exhibit 10.28

H.C. WAINWRIGHT & CO., INC.
ROTH CAPITAL PARTNERS, INCORPORATED
c/o H.C. WAINWRIGHT & CO., INC.
As Representatives of the Several Underwriters
One Boston Place
40th Floor
Boston, MA  02108

                                    Re:     Lock Up Agreement
Gentlemen:

                  In order to induce H.C. Wainwright & Co., Inc. and Roth
Capital Partners, Incorporated, the representatives of the several underwriters
(the "Representatives"), and Dynacs Inc., a Delaware corporation (the
"Company"), or its successor, to enter into an underwriting agreement with
respect to the public offering of shares of common stock, (the "Common Stock")
of the Company (or its successor), I hereby agree that for a period of one
hundred eighty (180) days following the effective date of the Company's (or its
successor's) Registration Statement in connection with such public offering, I
will not, without prior written consent of H.C. Wainwright & Co., Inc., directly
or indirectly, sell, offer to sell, grant an option for the sale of, transfer,
assign, hypothecate, pledge, distribute or otherwise dispose or encumber (either
pursuant to Rule 144 of the regulations under the Securities Act of 1933, as
amended, or otherwise) any shares of Common Stock of the Company (or its
successor) or options, rights, warrants or other securities convertible into,
exchangeable or exercisable for or evidencing any right to purchase or subscribe
for shares of Common Stock of the Company (or its successor) (collectively, the
"Securities") (whether or not beneficially owned by the undersigned), or any
beneficial interest therein, provided, however, that the undersigned may
transfer the Securities, or a beneficial interest therein, in a private
transaction pursuant to an exemption from registration (other than Rule 144)
provided that the transferee agrees in writing to be bound by the terms of this
agreement.

                  In order to enable the Representatives to enforce the
aforesaid covenants, I hereby consent to the placing of legends and
stop-transfer orders with the transfer agent of the Company's (or its
successor's) securities with respect to any of the Securities registered in my
name or beneficially owned by me.

                  This Agreement shall be binding on the undersigned and his,
her or its respective successors, heirs, personal representatives and assigns.

                  This Agreement shall be governed by and construed in
accordance with the laws of the State of New York, without giving effect to
conflict of law principles.

Dated:_____________________

___________________________                     ______________________________
Signature                                                Print Address

___________________________                     ______________________________
Print Name                                      ______________________________
                                                Print Social Security
                                                Number or Taxpayer I.D. Number<PAGE>   1
                                                                    EXHIBIT 10.1

FOURTH AMENDMENT attached to and made a part of that certain Lease dated
September 10, 1991, between FIRST INDUSTRIAL MORTGAGE PARTNERSHIP, L.P.,
successor in interest to WS Development Company, as Landlord, and SOMANETICS
CORPORATION, as Tenant, covering Premises at 1653 E. Maple Road, Troy, Michigan.

--------------------------------------------------------------------------------
NOTWITHSTANDING anything to the contrary contained in the Lease, Agreement,
Addenda to Lease, Termination of Agreement, and Extension of Lease to which this
Fourth Amendment is attached to and made a part thereof, the Landlord and Tenant
agree as follows:

1.   The Term of the Lease shall be extended three (3) years, commencing January
     1, 2001 and terminating December 31, 2003.

2.   The minimum net rent for said extended three (3) year Term shall be Five
     Hundred Ninety-Four Thousand One Hundred Eighty-Seven and 80/100 Dollars
     ($594,187.80) payable in monthly installments in advance as follows:
<TABLE>
<CAPTION>
                       Months           Monthly Base Rent
                       ------           -----------------
<S>                                     <C>
                       1-12             $16,179.47
                       13-24            $16,503.06
                       25-36            $16,833.12
</TABLE>
3.   Landlord, at no cost to Tenant, shall maintain and repair the roof as
     Landlord deems necessary for the term of this renewal.

4.   Notwithstanding the provisions of Section 1 of this Fourth Amendment to the
     contrary, and provided that Tenant is not in material default under this
     Lease, if Tenant is acquired by an independent third party at any time
     during the three (3) year extension Term contemplated by this Fourth
     Amendment, Tenant shall have a single option to terminate the Term of this
     Lease by giving written notice to Landlord of such acquisition and
     termination election at least sixty (60) days prior to the closing of such
     acquisition. If the termination notice is duly given by Tenant, the
     termination shall be effective as follows: (i) if the acquisition closing
     occurs on or before December 31, 2002, the termination shall be effective
     on the later of (1) December 31, 2002, or (2) sixty (60) days after
     delivery by Tenant of its acquisition/ termination election notice; and
     (ii) if the acquisition closing occurs on or after January 1, 2003, the
     termination shall be effective on the later of (1) the date that the
     acquisition closing occurs, or (2) sixty (60) days after delivery by Tenant
     of its acquisition/termination election notice. For purposes of this
     Section 3, Tenant shall be deemed "acquired" if it is a constituent
     corporation in a statutory merger, or substantially all of the assets of
     Tenant are acquired, or a controlling interest in the voting stock of
     Tenant is acquired.

All other terms and conditions of said Lease, Agreement, Addenda to Lease,
Termination of Agreement and Extension of Lease to remain in full force and
effect unless in conflict with the terms and conditions of this Fourth Amendment
shall prevail and control.

                                 LANDLORD:
                                 FIRST INDUSTRIAL MORTGAGE
                                 PARTNERSHIP, L.P., a
                                 Delaware limited
                                 partnership, successor in
                                 interest to WS Development Company

                                 By:      First Industrial Mortgage Corporation,
                                          a Maryland corporation
                                 Its:     General Partner

                                        /s/ Richard S. Czerwinski
                                        -------------------------
                                 By:    Richard S. Czerwinski, Regional Director

                                 TENANT:
                                 SOMANETICS CORPORATION, a Michigan corporation

                                 By:    /s/ Bruce J. Barrett
                                        -------------------------
Dated:  April 13, 2000           Its:   President & CEO

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