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                                                                   EXHIBIT 10.90

                                  INVISA, INC.
                               2003 INCENTIVE PLAN

                             STOCK OPTION AGREEMENT

<TABLE>
<CAPTION>
<S>                                  <C>
OPTION AGREEMENT NUMBER:             2003-1

DATE OF GRANT/AWARD:                 November 6, 2003

NAME OF OPTIONEE:                    Herb M. Lustig

OPTIONEE'S SOCIAL SECURITY NUMBER:   ###-##-####

INITIAL VESTING DATE:                June 30, 2004

INITIAL EXERCISE DATE:               June 30, 2004

EXPIRATION DATE:                     November 6,  2013(the "Option Termination Date")
</TABLE>

      1. Dated as of the  above-stated  Date of Grant/Award (the "Grant Date") a
Stock  Option  (the  "Option")  is hereby  granted to the  above-named  Optionee
pursuant to the Invisa,  Inc. 2003 Incentive Plan, as amended (the "Plan").  The
Award of this Option  conveys to the Optionee the right to purchase from Invisa,
Inc. (the "Company") up to One Million Four Hundred Thousand  (1,400,000) shares
of Stock (the "Option Shares") under the Plan at an exercise price of $ 3.41 per
share.  To the  fullest  extent  possible,  the  Option  shall be  treated as an
Incentive  Stock  Option,  as such  term is  defined  under  Section  422 of the
Internal Revenue Code. To the extent the Option is not eligible to be treated as
an Incentive  Stock Option in full,  the part that is not eligible for Incentive
Stock Option treatment shall be treated as a Nonqualified Stock Option.

      2. Except as specifically  provided herein, the rights of the Optionee, or
of any other person  entitled to exercise the Option,  are governed by the terms
and provisions of the Plan.  The Option is granted  pursuant to the terms of the
Plan,  which are incorporated  herein by reference,  and the Option shall in all
respects  be  interpreted  in  accordance  with the  Plan.  Notwithstanding  the
foregoing  or anything to the contrary in the Plan  (including,  but not limited
to,  Section 6.7 (b)),  the Option shall not be  terminated  prior to, and shall
continue  to be  exercisable  until,  the  Option  Termination  Date even  after
Optionee's termination of Service for any reason.

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      3. To the extent not previously  exercise,  the Option and all rights with
respect  thereto,  shall  terminate  and  become  null  and  void on the  Option
Termination Date.

      4. The Option is  exercisable in  installments  as provided  below,  which
shall be cumulative.  To the extent that the Option has become  exercisable with
respect to a number of shares of Stock, the Option may be exercised, in whole or
in part, at any time or from time to time prior to the Option  Termination Date.
The following  table  indicates  each date (the  "Vesting  Date") upon which the
Optionee  shall be entitled to exercise the Option with respect to the number of
shares of Stock indicated beside the date.

      NUMBER OF SHARES OF STOCK                          VESTING DATE
      -------------------------                          ------------
               233,340                                  June 30, 2004
               116,666                                September 30, 2004
               116,666                                December 31, 2004
               116,666                                  March 31, 2005
               116,666                                  June 30, 2005
               116,666                                September 30, 2005
               116,666                                December 31, 2005
               116,666                                  March 31, 2006
               116,666                                  June 30, 2006
               116,666                                September 30, 2006
               116,666                                December 31, 2006

      Except  as  otherwise  specifically  provided  herein,  there  shall be no
proportionate  or partial vesting in the periods prior to each Vesting Date, and
all vesting  shall  occur only on the  respective  Vesting  Date.  Any  unvested
portion of the Option will terminate  upon a termination of Optionee's  Services
unless,  in the event of a termination of Services without cause,  such unvested
portion becomes vested pursuant to the Optionee's  Employment Agreement with the
Company.  The vested portion of the Option will not terminate as the result of a
termination of Optionee's Services.

      5. The Option shall be deemed to be fully  vested,  without  regard to the
above  table,  upon  (a) a sale,  merger  or  other  transaction  by one or more
shareholders of the Company of more than 50% of the Company's  Common Stock to a
person or entity which is not directly or  indirectly  related to or  affiliated
with the sellers of such Common Stock,  (b) a sale or exchange of  substantially
all the assets of the Company, or (c) a change of control of the Company.

      6. The Option may be exercised by the  Optionee's  heirs,  successors,  or
legal representatives.

      7. The  Option  may be  exercised  with  respect to all or any part of the
number of Vested Shares by the giving of written notice ("Notice") of the intent

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to  exercise  to the  Company  at  least  five  days  prior to the date on which
exercise is to occur.  The Notice shall specify the exercise date and the number
of Option Shares as to which the Option is to be exercised.  Full payment of the
Option  exercise price by any of the means of  consideration  provided for under
the Plan shall be made on or before the exercise  date  specified in the Notice.
Such full payment  having  occurred on or before the exercise date  specified in
the Notice, as soon thereafter as is practicable,  the Company shall cause to be
delivered to the Optionee a certificate  of  certificates  for the Option Shares
then being purchased.  If the Optionee fails to pay for any or the Option Shares
specified  in the  Notice,  or fails to accept  delivery of Option  Shares,  the
Optionee's  right to  purchase  such  Option  Shares  may be  terminated  by the
Company.

      The option  exercise price and tax  withholding  may be paid in cash or in
shares of the Company's Common Stock owned by Optionee for at least 6 months, at
its Fair Market  Value (as defined  below) on the date  preceding  the  exercise
date.

      "FAIR MARKET VALUE" means,  as of a specific date, with respect to a share
of Stock of the  Company,  the  closing  price on such date (or,  if there is no
closing  price,  then the closing bid price) of the Company's  Stock reported on
the Composite Tape, or if not reported  thereon,  then such price as reported in
the trading reports of the principal securities exchange in the United States on
which  the  Stock is  listed,  or if the  Stock is not  listed  on a  securities
exchange in the United  States,  the mean between the dealer  closing  "bid" and
"ask"  prices  on the  over-the-counter  market  as  reported  by  the  National
Association of Security Dealers Automated Quotation System (NASDAQ), or NASDAQ's
successor,  or if not reported on NASDAQ, the fair market value of such stock as
determined  by the Board of  Directors  in good faith and based on all  relevant
factors.

      8. There are no  restrictions  or rights of first  refusal  or  repurchase
rights with  respect to any share  acquired  as a result of the  exercise of the
Option,  except as required by any applicable  federal or state securities laws.
The Company  agrees to use its best effort to have any shares of Stock  acquired
by the  exercise  of the Option  registered  with the  Securities  and  Exchange
Commission  pursuant  to a  Form  S-8 or  other  registration  statement,  which
registration  statement  will be filed by the Company to the extent  practicable
within ten (10) months after the  effective  date of the  Optionee's  employment
agreement with the Company.

      9. The Optionee  acknowledges  having received and read a copy of the Plan
and this Agreement and agrees to comply with all laws,  rules,  and  regulations
applicable to the Award and to the sale or other disposition of the Stock of the
Company received.

      10. Any notice to the  Company  provided  for in this  Agreement  shall be
addressed to it in care of its  Secretary at its  executive  offices  located at
4400 Independence Court, Sarasota, Florida 34234, and any notice to the Optionee
shall be addressed to the Optonee at the address  currently shown on the payroll
records  of the  Company.  Any  notice  shall be deemed  duly  given if and when
properly addressed and posted by registered or certified mail, postage prepaid.

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      11. The  termination of the Plan will not affect the Option.  The terms of
the Option shall not be amended or modified without the consent of the Optionee.

      12.  In the event of an  inconsistency  between  the  terms of this  Stock
Option Agreement and the Plan, the Stock Option Agreement shall govern.

      IN WITNESS WHEREOF, Invisa, Inc. has caused its duly authorized offices to
execute  this Stock  Option  Agreement,  and the  Optionee has placed his or her
signature hereon, effective as of the Grant Date.

INVISA, INC.

By: /s/ Edmund C. King
Edmund C. King
Chief Financial Officer

ACCEPTED AND AGREED TO:

----------------------------
HERB M. LUSTIG

                                   Page 4 of 4Exhibit 10.19

                               EXCHANGE AGREEMENT

         THIS EXCHANGE AGREEMENT ("Agreement") is made as of the 26th day of
February, 2004, by and between INNOVATIVE SOFTWARE TECHNOLOGY, INC ("IST"), a
California corporation, ENERGY PROFESSIONAL MARKETING GROUP, INC ("EPMG"), a
Utah corporation which is a wholly owned subsidiary of IST, and JAMES R. GARN
("Garn') and ETHAN A WILLIS ("Willis")

                                    Recitals

      A. Garn and Willis formed EPMG in 1999;

      B. Subsequently, Garn and Willis entered into a Stock Purchase Agreement
dated December 31, 2001, whereby IST acquired all of the capital stock of EPMG
from Garn and Willis in exchange for voting stock of IST;

      C. Simultaneously with their sale of EPMG to IST, Garn and Willis entered
into identical employment agreements with EPMG, which employment agreements were
amended on July 15, 2002 (collectively, the "Employment Agreements");

      D. Garn and Willis have since asserted a number of breach of contract
claims against IST, many of which are based on IST's representations to Garn and
Willis;

      E. Garn and Willis have also asserted that the Employment Agreements are
void and are not enforceable under Utah law, and

      F. Garn and Willis have agreed to waive, release and compromise their
breach of contract claims against IST with respect to the Stock Purchase
Agreement in exchange for the

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cancellation by EPMG of, and IST's waiver of any rights it holds in the
Employment Agreements.

      NOW, THEREFORE, in consideration of the mutual covenants and promises set
forth herein, together with other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties agree as follows:

      1. Exchange. IST, as parent of EPMG, hereby releases and disclaims any
interest it has relating to the Employment Agreements and waives any claim it
may have against EPMG, its officers or directors relating to EPMG's cancellation
of the Employment Agreements as set forth herein. EPMG hereby cancels the
Employment Agreements Each of Garn and Willis releases IST and EPMG and their
respective officers and directors from any and all causes of action, judgments,
executions, claims and demands, of every kind and nature whatsoever, based upon
IST's alleged breaches of contract under the terms of the Stock Purchase
Agreement.

      2. Effective Date. The foregoing exchange transaction is effective
immediately upon the parties' execution of this Exchange Agreement and the
delivery by each party of an executed copy of this Agreement to each other
party.

      3. Further Assurances. Each party shall execute and deliver such documents
as any other party shall reasonably deem necessary or appropriate to cause the
parties to obtain the benefits contemplated by this Agreement

      4. Representations and Warranties of IST and EPMG. Each of IST and EPMG
hereby represents and warrants to each of Garn and Willis that:

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      (a) IST and EPMG have full legal authority to enter into this Agreement
and upon execution and delivery hereof this Agreement will be a valid and
binding obligation of IST and EPMG, enforceable against them in accordance of
its terms.

      (b) IST and EPMG are not required to give any notice to or obtain any
consent from any person in connection with the execution and delivery of this
Agreement or the consummation and performance of the exchange contemplated
hereby.

      (c) Neither the execution and delivery of this Agreement, nor the
consummation or performance of the exchange contemplated hereby, will
contravene, conflict with or result in a violation of any contract or
organizational document applicable to IST.

      (d) Neither IST, EPMG nor their agents have incurred any obligation or
liability, contingent or otherwise, for a brokerage or finders fee or agent's
commission or other similar payment in connection with this Agreement for which
Garn or Willis may be liable.

         5. Representations and Warranties of the Shareholders. Each of Garn and
Willis hereby severally represents and warrants to IST that:

            (a) He has full legal authority to enter into this Agreement and
upon execution and delivery hereof this Agreement will be his valid and binding
obligation, enforceable against him in accordance of its terms.

            (b) He is not required to give any notice to or obtain any consent
from any person in connection with the execution and delivery of this Agreement
or the consummation and performance of the exchange contemplated hereby.

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            (c) Neither the execution and delivery of this Agreement, nor the
consummation or performance of the exchange contemplated hereby, will
contravene, conflict with or result in a violation of any contract applicable to
him.

            (d) Neither he nor any of his affiliates has incurred any obligation
or liability, contingent or otherwise, for brokerage or finder's fees or agent's
commissions or similar payments in connection with this Agreement for which IST
may be liable.

      6. Notice. Any notice which is required or permitted to be given to any
party to this Agreement shall be deemed to have been given only if such notice
is reduced to writing and delivered, either personally or by a reputable
courier, with return receipt delivered, to the appropriate party as set forth
below

               Innovative Software Technology, Inc.
               204 N W Platte Valley Drive Riverside,
               MO 64150

               James R. Garn
               5072 North 300
               West Provo, UT 84604

               Ethan A. Willis
               5072 North 300
               West Provo, UT 84604

With a copy to J. Gordon Hansen
               Holme Roberts & Owen LLP
               299 South Main Street, Suite 1800
               Salt Lake City, UT 84111

      7     Miscellaneous Matters

            (a) This Agreement shall not be assigned by any party without the
prior written consent of each other party.

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<PAGE>

                  (b) The Agreement shall be binding upon and shall inure to the
benefit of the parties hereto, their successors and assigns.

            (c) Should a default occur in the performance of any obligation set
forth in this Agreement, the defaulting party shall pay to the other party, in
addition to any damages which result from such default, the related costs and
expenses, including reasonable attorneys' fees, incurred by the non-defaulting
party in enforcing his or its rights hereunder.

            (d) This Agreement shall be construed in accordance with and
governed by the internal laws of the State of Utah.

            (e) This Agreement constitutes the complete and entire statement of
all terms, conditions and representations of the agreement between IST, on the
one hand, and Garn and Willis on the other, with respect to its subject matter.

            (f) Nothing in this Agreement, express or implied, is intended to
confer upon any person not a party to this Agreement any rights or remedies of
any nature whatsoever under or by reason of this Agreement.

      IN WITNESS WHEREOF, the parties have executed this Agreement upon the date
first herein written.

<PAGE>

Seller

ENERGY PROFESSIONAL
MARKETING GROUP, a Utah corporation

By     /s/ Ethan A. Willis
       -----------------------------
Name   Ethan A. Willis
Title  CEO

Seller

INNOVATIVE SOFTWARE
TECHNOLOGIES, INC., a
California corporation

By     /s/ Douglas Shane Hackett
       -----------------------------
Name   Douglas Shane Hackett
Title  President

       /s/ James R. Garn
       -----------------------------
       James R. Garn

       /s/ Ethan A. Willis
       -----------------------------
       Ethan A Willis

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