Document:

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                                                                   EXHIBIT 10.76

                       INVESTMENT AGREEMENT MODIFICATION I

         This Investment Agreement Modification I ("Modification"), dated as of
July 21, 2003, by and among INVISA, INC., a Nevada corporation ("Company"), and
BARBELL GROUP, INC. ("Investor").

         Whereas, the parties entered into an Investment Agreement dated as of
May 9, 2003 ("Investment Agreement") providing, inter alia, that the Investor
shall invest up to one million dollars ($1,000,000) to purchase the Company's
common stock, $.001 par value per share (the "Common Stock");

         Whereas, contemporaneously with the execution and delivery of the
Investment Agreement, the parties executed and delivered a Registration Rights
Agreement pursuant to which the Company agreed to register the Common Stock to
be purchased by the Investor, the Company subsequently filed a Registration
Statement pursuant to the Registration Rights Agreement, and the Registration
Statement was declared effective on July 7, 2003; and

         Whereas, the Company wishes the Investor to purchase $100,000 of Common
Stock and the Investor is willing to do so upon the terms and conditions of this
Modification.

         Now therefore, the Company and the Investor hereby agree as follows:

         1.       Purchase and Sale of Common Stock. Simultaneously with the
execution of this Modification, upon the terms and conditions set forth herein,
the Company shall issue and sell to the Investor, and the Investor shall
purchase from the Company, up to that number of Shares having an aggregate
Purchase Price of $100,000.

         2.       Delivery of Put Notice. At any time within 30 days from the
date of this Modification, the Investor shall choose a Pricing Period, as
defined in the Investment Agreement. The Investor shall give written notice to
the Company of the Pricing Period and on the next Trading Day following the
Pricing Period, the Company shall delivery a Put Notice to the Investor which
states the Purchase Price of the Shares to be sold and the total number of
Shares to be sold based on the Purchase Price and the Put Amount, and for the
Pricing Period selected by Investor. If the Company does not deliver a Put
Notice as provided herein, the Investor may complete the Put Notice and fax the
Put Notice to the Company.

         3.       No Other Changes. Except as provided in this Modification,
none of the other terms and conditions of the Investment Agreement shall be
amended or modified and the Investment Agreement shall remain in full force and
effect.

         4.       Costs and Expenses. The costs and expenses of preparing this
Modification shall be borne by the Company and may be deducted from the Purchase
Price proceeds.

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         This Investment Agreement has been entered into and executed as of the
date first above written.

                                               INVISA, INC.

                                               By:
                                                   ------------------------

                                               BARBELL GROUP, INC.

                                               By:
                                                   ------------------------<PAGE>
                                                                   EXHIBIT 10.77

                          JOINT DEVELOPMENT AGREEMENT

     Invisa, Inc., a Nevada Corporation and its wholly owned subsidiary
SmartGate, L.C., a Florida Limited Liability Company ("SmartGate") and
Dominator International LTD ("Dominator"), for good and valuable consideration,
enter into this Agreement as of this 21st day of July, 2003.

     1. INTRODUCTION. SmartGate and Dominator have entered into a joint
Confidentiality Agreement protecting the confidentiality of their respective
trade secrets and proprietary information. By virtue of this Agreement, both
SmartGate and Dominator express interest in cooperating and sharing ideas with
each other regarding the potential for Dominator, as a customer of SmartGate,
to benefit from SmartGate's proprietary non-contact safety technology.

     2. PURPOSE. The purpose of this Agreement is to enable SmartGate and
Dominator to have the benefit of an exchange of ideas regarding the potential
utilization of SmartGate's non-contact safety technology by Dominator without
jeopardizing or adversely affecting their respective rights and interests.
Accordingly, this Agreement sets forth the terms and conditions pursuant to
which SmartGate and Dominator can, in the exercise of their respective
discretion, explore, identify and facilitate the ability of Dominator to
utilize and/or integrate the SmartGate non-contact safety technology in its
powered closure device products. In entering into this Agreement, neither party
assumes nor accepts any obligation, whether contractual or otherwise, to
perform any task, or engage in any activity, or assume any financial
obligation. Further, by entering into this Agreement, neither SmartGate nor
Dominator appoints nor authorizes the other party to serve as an agent or
otherwise represent it in any capacity. The parties acknowledge that Dominator
has, by virtue of this Agreement, no right or entitlement to use, purchase or
benefit from SmartGate's technology and any such right shall be governed by a
separate written agreement between the parties.

     3. TERM. This Agreement may be terminated by either party upon thirty (30)
days' written notice; however, notwithstanding termination, this Agreement
shall continue to govern the relationship, rights and obligations of the
parties with regard to the actions and disclosures of the parties hereunder,
prior to termination.

     4. COSTS AND EXPENSES. SmartGate and Dominator shall each bear and pay
their own costs and expenses in connection with this Agreement. Neither party
assumes or accepts any obligation to expend any sums or incur any expenses in
connection with this Agreement. Any and all expenditures shall be at the sole
discretion of the party incurring same.

     5. FUTURE AGREEMENTS. By entering into this Agreement, neither SmartGate
nor Dominator grant to the other party any right, license or other entitlement
of any description to use, purchase, or benefit from its products, technology,
tradenames, trademarks, trade secrets, patents or other proprietary
information. No right or entitlements to use, purchase, or benefit from
products, technology, tradenames, trademarks, trade secrets, patents or other
proprietary information of the other party, shall arise from or be inferred
from this Agreement or the activities of the parties pursuant to the Agreement.
Any grant of a license or other right to use, purchase, or benefit from the
other party's products, technology, tradenames, trademarks, trade secrets,
patents or other proprietary information shall only be made in writing,
executed by both parties to this Agreement.
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     6. INVENTIONS AND IMPROVEMENTS. Any invention, improvement, trade secret
or other proprietary information discovered by the parties in connection with
or pursuant to this Agreement shall be exclusively owned as follows:

        a)  If relating primarily to SmartGate's technology, products, patents
or the application thereof (for example, if relating to non-contact safety
sensing, or matters directly related thereto, such as communication, antennas,
or the methodology of applying SmartGate's non-contact safety sensing
technology, antennas or components to powered closure devices), SmartGate shall
have exclusive ownership and Dominator shall have no right, title or interest
therein and, in the case of an invention, if the inventor is an employee of
Dominator, Dominator's employee's rights in the invention will be transferred
to Dominator and Dominator will assign those rights to SmartGate; and

        b)  If relating primarily to Dominator's technology, products, patents
or the application thereof (for example, powered closure devices or the
operation thereof, separate and distinct from non-contact safety sensing and
the attachment or application of non-contact safety sensing to powered closure
devices), Dominator shall have exclusive ownership and SmartGate shall have no
right, title or interest therein and, in the case of an invention, if the
inventor is an employee of SmartGate, SmartGate's employees rights in the
invention will be transferred to SmartGate and SmartGate will assign those
rights to Dominator.

     Each party shall execute such documents as may be reasonably necessary to
carry out the intent of this provision.

     7. PRESS RELEASE. Following the execution of this Agreement, the parties
shall issue a joint Press Release. Any additional Press Releases relating to
this Agreement or matters relating thereto, shall be by joint release issued
and approved by both parties hereto.

     8. ARBITRATION. Except for injunctions which may be pursued in any court
of competent jurisdiction, any dispute or disagreement between the parties,
relating to this Agreement or the subject matter hereof, shall be exclusively
resolved by binding arbitration between the parties before the American
Arbitration Association seated in the city of the party instituting said
arbitration. Each party shall bear its own costs in connection with such
arbitration. The party commencing the arbitration shall pay the cost of
commencing the arbitration and the fee of the arbitrators.

     9. MISCELLANEOUS. This Agreement constitutes the entire understanding of
the parties and shall not be amended or otherwise altered, except in writing,
executed by the parties hereto. This Agreement shall be governed by and
construed in accordance with the laws of the State of Florida. This Agreement
shall be binding and shall inure to the benefit of the heirs, assigns and
successors in interest.

     The parties hereby set their hand and seal on the day and year first
written.

SmartGate, Inc.                                   Dominator International LTD

By: /s/ STEPHEN A. MICHAEL                        By: /s/ WILLIAM GARY FOSTER
  -------------------------                           -------------------------
             Its PRESIDENT                                  Its GENERAL MANAGER

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