Document:

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                                                                   Exhibit 10.12

                               OPTION AGREEMENT
                               ----------------

     THIS OPTION AGREEMENT ("Agreement") is entered into to be effective as of
                             ---------
October 1, 2000, by and between DALMAC/GOLDCOR REAL ESTATE VENTURE, LTD., a
Texas limited partnership ("DalMac") and PANJA INC., a Texas corporation
                            ------
("Panja").
  -----

                               R E C I T A L S:

     WHEREAS, DalMac and Panja entered into that certain Lease dated November
22, 1999, relating to a build-to-suit transaction by and between DalMac and
Panja for the construction of an approximately 128,700 gross square foot
building on 10.00 acres of land more particularly described therein as the
"Land"; and
 ----

     WHEREAS, pursuant to the terms of Rider 4 of the Lease, DalMac granted to
Panja certain limited rights of option and rights of first refusal to acquire
certain land described in the Lease as the "Adjacent Land"; and
                                            -------------

     WHEREAS, DalMac has platted the Land and the Adjacent Land such that the
correct legal description for each of the Land and the Adjacent Land is after
the date of such Plat as reflected on Exhibit "A" and Exhibit "A-1",
                                      -----------     -------------
respectively, attached hereto, and the Lease is being amended to reflect the
platting and changing of the legal descriptions for each of the Land and the
Adjacent Land; and

     WHEREAS, DalMac has assigned its rights and obligations under the Lease to
DalMac/GoldCor Project No. Shiloh III, Ltd. ("Shiloh III"), save and except for
                                              ----------
its obligations under Rider 4 of the Lease; and

     WHEREAS, DalMac and Panja have mutually determined that they desire (i) to
extend the term of the "Option Period" (defined below) and attendant pricing for
                        -------------
each time component of the Option Period, and (ii) in consideration of the
extension and modification of the Option Period to terminate the rights of first
refusal contemplated by the terms of Rider 4 of the Lease; and

     WHEREAS, DalMac and Panja desire to enter into this Agreement to reflect in
greater detail the obligations of DalMac or its permitted successors under Rider
4 of the Lease; and

     WHEREAS, Shiloh III is joining in the execution of this Agreement solely
for purposes of acknowledging that it may, in the future, modify the Lease in
the manner prescribed below.

     NOW, THEREFORE, for Ten Dollars ($10.00) and other good and valuable
consideration, the receipt, sufficiency and adequacy of each of which is hereby
expressly acknowledged, the parties hereto do hereby agree as follows:

OPTION AGREEMENT - Page 1
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     1.   Option Period. DalMac covenants that it shall not convey nor grant a
          -------------
right to purchase the Adjacent Land described on Exhibit "A-1" to any third
                                                 ------------
party during the Option Period. Notwithstanding the foregoing, DalMac may convey
the Adjacent Land to either Shiloh III or another successor landlord under the
Lease or any affiliate of DalMac which otherwise agrees to be bound by the terms
of this Agreement (each such party being referred to herein as a "Permitted
                                                                  ---------
Owner" and the conveyances being referred to as the "Permitted Conveyances").
-----                                                ---------------------
Specifically, save and except for the Permitted Conveyances, the parties hereto
agree that DalMac will not sell the Adjacent Land to any party other than Panja
during the first two (2) calendar years of the Lease Term (the "Option Period"),
                                                                -------------
and that so long as the Lease has not terminated during the Option Period, Panja
shall have the right to acquire the Adjacent Land during the Option Period as
follows:

          (a) If the option conferred hereby is properly and timely exercised by
     Panja following the Commencement Date specified in the Lease, which the
     parties acknowledge and agree is October 1, 2000, but prior to the
     expiration of six (6) months from the Commencement Date of the Lease, such
     date being hereinafter referred to as the "Exercise Date", which for
                                                -------------
     purposes of this Paragraph 1 shall mean the earlier to occur of the date
     upon which an Option Notice is given by Panja and received by DalMac
     pursuant to this Paragraph 1 or the date upon which the Option Notice was
     required to be given pursuant to any of the subparagraphs of this Paragraph
     1 which provide different dates for exercising an option at a variable
     price. For any Option Notice to be effective, it must be given by Panja in
     accordance with Paragraph 5 below and actually received by DalMac prior to
                     -----------
     the expiration of the applicable time component of the Option Period in
     question. If the option is timely exercised by Panja prior to the initial
     Exercise Date and subject to the additional time provided below closed not
                   ---
     later than thirty (30) days following that Exercise Date, the Purchase
     Price for the Adjacent Land shall be $4.50 per square foot;

          (b) If the option conferred hereby is properly and timely exercised by
     Panja within the six (6) month period following the period specified in
     subparagraph (a) above and subject to the additional time provided below
     closed by Panja not later than thirty (30) days following that Exercise
     Date, the Purchase Price shall be $5.00 per square foot;

          (c) If the option conferred hereby is properly and timely exercised by
     Panja within the six (6) month period following the period specified in
     subparagraph (b) above and subject to the additional time provided below
     closed by Panja not later than thirty (30) days following that Exercise
     Date, the Purchase Price shall be $5.25 per square foot; and

          (d) If the option conferred hereby is properly and timely exercised by
     Panja within the six (6) month period following the period specified in
     subparagraph (c) above and subject to the additional time provided below
     closed by Panja not later than thirty (30) days following that Exercise
     Date, the Purchase Price shall be $5.50 per square foot;

provided further, however, to the extent that Panja provides a proper Option
Notice prior to the applicable Exercise Date, Panja shall be entitled to a
period not to exceed sixty (60) days from the date upon which

OPTION AGREEMENT - Page 2
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Panja delivers an early Option Notice in which to close. By way of example, if
the mandatory Exercise Date for an applicable component of the Option Period is
April 1, 2001, and Panja delivers its Option Notice on March 1, 2001, Panja
shall be entitled to have the full sixty (60) days in which to consummate the
closing and retain its rights hereunder. Similarly, if Panja were to provide an
effective Option Notice on April 15, 2001, it would have forty-five (45) days in
which to consummate the closing in accordance with the terms and provisions of
this Agreement. In no event other than as specified immediately below will a
closing be extended beyond thirty (30) days from the date upon which such Option
Notice was required to be given in order to have Panja avail itself of the
Purchase Price attributable to such component of the Option Period.

The thirty (30) day period to close specified in (a) through (e) above shall be
automatically extended on a day-for-day basis for (i) each day of delay
occasioned by DalMac failing to provide the title commitment within the time
period described below or (ii) a default by DalMac which is not cured within the
time frame provided for the cure of the same.

[Each of the above described prices are a "net" price with each party
responsible for its own costs and expenses with no adjustments between the
parties save and except the proration of ad valorem taxes and DalMac's
contribution at Closing to the total cost of a standard TLTA title insurance
policy for Panja, which contribution shall be limited to $7,000.00 The
applicable Purchase Price, depending on the date on which the option is properly
and timely exercised and thereafter closed by Panja, shall be determined by the
number of square feet contained in the Adjacent Land as reflected by the
surveyor's calculations based upon the platted description for the Adjacent
Land.  The parties acknowledge that the square feet contained in the Adjacent
Land per the recorded Plat is 187,313.]

     In order for Panja to be entitled to exercise the option conferred hereby,
such option must be exercised by a written notice to DalMac and closed on an all
cash basis within the time frames specified above. Panja will be permitted
access to the Adjacent Land for purposes of inspections pursuant to a separate
inspection agreement. Title to the Adjacent Land will be conveyed by Special
Warranty Deed on an "As Is-Where Is" basis, save and except for covenants of
title contained in the Special Warranty Deed. The Purchase Price will be paid in
immediately good funds at the Closing, which for purposes of this Agreement
shall mean funds delivered to DalMac on the Closing Date in time to permit same
day wiring. The parties will execute and deliver at the applicable Closing, such
additional documents and instruments as are reasonably necessary for the
consummation of the transaction including, without limitation, such reasonable
evidence of authority as required by the Title Company to issue the Owner's
Policy of Title Insurance for the benefit of Panja, Non-Foreign Status
Affidavits, Closing Statements and other affidavits reasonably requested by the
Title Company in order to issue the Owner's Policy of Title Insurance. Within
fifteen (15) days following the exercise of the Option by Panja, DalMac shall
provide to Panja a Commitment for Title Insurance covering the Adjacent Land
which shall be the basis for the Owner's Policy of Title Insurance.
Notwithstanding anything contained herein to the contrary, DalMac's obligations
as to the issuance of the Owner's Policy of Title Insurance are expressly
limited as follows:

OPTION AGREEMENT - Page 3
<PAGE>

          (i) DalMac will have no obligation to provide the cash credit
     referenced above at Closing unless Panja contributes the remaining funds
     necessary to acquire an Owner's Policy of Title Insurance and actually
     causes the Owner's Policy of Title Insurance to be procured; and

          (ii) DalMac shall have no obligations to cure any objections to title
     raised by Panja, save and except that DalMac shall be required to discharge
     the liens of any debt obligations secured by the Adjacent Land.

     In the event that DalMac is in default in its obligations hereunder
relating to the conveyance of the Adjacent Land in accordance with the terms
hereof, then Panja shall provide to DalMac written notice of the matter which it
believes constitutes the event of default hereunder, and DalMac shall have
thirty (30) days from the receipt of such notice within which to cure or satisfy
any matter which actually constitutes an event of default hereunder. If DalMac
fails to satisfy such event of default within such thirty (30) day time period
as the same may be extended by agreement of the parties, Panja shall have as its
sole remedy hereunder the right to bring an action for specific performance by
DalMac of DalMac's obligations to convey the Adjacent Land in accordance with
the provisions of this Agreement.

Panja's rights to acquire the Adjacent Land pursuant to the option conferred
hereby shall automatically cease upon the earlier to occur of a termination of
the Lease or the expiration of the Option Period.

     2.   First Refusal. Any references to the Right of First Refusal in Rider 4
          -------------
are hereby deleted in their entirety, and the parties hereto acknowledge and
agree that effective with the execution of this Agreement, such Right of First
Refusal has terminated.

     3.   Shiloh III Participation. Shiloh III is entering into this Agreement
          ------------------------
for the limited purpose of acknowledging its potential obligation to modify the
Lease in the manner described in Paragraph 2 above and for no other purpose.

     4.   Termination Date. All rights of Panja and rights, duties and
          ----------------
obligations of DalMac or any Permitted Owner of the Adjacent Land, or
alternatively Shiloh III, hereunder shall automatically terminate and be of no
further force and effect on the earlier to occur of (i) termination of the
Lease, or (ii) the expiration of the Option Period, including Panja's exercising
the Option and thereafter failing to close in accordance with this Agreement.
The date upon which this Agreement terminates shall be the "Termination Date".
                                                            ----------------
Upon notification to Panja by DalMac of the occurrence of the Termination Date,
Panja shall execute and deliver to DalMac a release of the rights of Panja
hereunder in recordable form as requested by DalMac, failing which DalMac shall,
within twenty (20) days of such request and failure by Panja to deliver the
required release, have the right to file a release of the Memorandum of this
Agreement described in Paragraph 6 below, which will be binding upon the parties
hereto.

     5.   Notices. Any notice or document required to be delivered hereunder
          -------
shall be deemed to be delivered if actually received or, if sooner and whether
or not actually received, upon deposit in the United States mail, postage
prepaid, certified or registered mail (with or without return receipt requested)

OPTION AGREEMENT - Page 4
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addressed to the intended recipient at the address set forth below or at such
other address as the applicable party has specified by at least thirty (30) days
prior written notice delivered to the other party hereto in accordance herewith.
For purposes of notice, the addresses of the parties shall be as follows:

          If to DalMac:  DalMac/GoldCor Real Estate Venture, Ltd.
                         111 W. Spring Valley
                         Richardson, Texas 75081
                         Attention:  S. Randall Hearne

          If to Panja:   Panja Inc.
                         3000 Research Drive
                         Richardson, Texas 75082
                         Attention:  Wendel Kirton

     6.   Memorandum.  The parties agree to record a Memorandum of this
          ----------
Agreement (the "Memorandum") in the form attached hereto as Exhibit "B" in the
                ----------                                  -----------
Deed Records of Collin County, Texas, as an exception to title to the Adjacent
Land described on Exhibit "A-1" only which Memorandum shall be released in
                  -------------
accordance with Paragraph 4 above. No other evidence of this Agreement or the
actual text of this Agreement may be recorded.

     7.   Applicable Law. The obligations of the parties hereto shall be
          --------------
performable in Dallas County, Texas. This Agreement shall be construed and
interpreted in accordance with the laws of the State of Texas. Where required
for proper interpretation, words in the singular shall include the plural; the
masculine gender shall include the neuter and the feminine, and vice versa. The
terms "heirs, executors, administrators and assigns" shall include "successors,
legal representatives and assigns."

     8.   Amendment. This Agreement may not be modified or amended, except by an
          ---------
agreement in writing signed by the DalMac or if applicable a Permitted Owner and
Panja. The parties may waive any of the conditions contained herein or any of
the obligations of the other party hereunder, but any such waiver shall be
effective only if in writing and signed by the party waiving such conditions or
obligations.

     9.   Time is of the Essence. Time is of the essence of this Agreement. In
          ----------------------
the event that the date upon which any duties or obligations hereunder to be
performed shall occur upon a Saturday, Sunday or legal holiday, then, in such
event, the due date for performance of any duty or obligation shall thereupon be
automatically extended to the next succeeding business day.

     10.  Enforcement. In the event it becomes necessary for either party hereto
          -----------
to file a suit to enforce this Agreement or any provisions contained herein, the
party prevailing in such action shall be entitled to recover, in addition to all
other remedies or damages, reasonable attorneys' fees incurred in such suit.

OPTION AGREEMENT - Page 5
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     11.  Interpretation. The descriptive headings of the several Articles,
          --------------
Sections and Paragraphs contained in this Agreement are inserted for convenience
only and shall not control or affect the meaning or construction of any of the
provisions hereof. Where required for proper interpretation, words in the
singular shall include the plural, and the masculine gender shall include the
neuter and feminine, and vice versa.

     12.  Entire Agreement. This Agreement, including the Exhibits hereto and
          ----------------
the items to be furnished in accordance herewith, constitutes the entire
agreement among the parties pertaining to the subject matter hereof and
supersedes all prior and contemporaneous agreements and understandings of the
parties in connection therewith. No representation, warranty, covenant,
agreement or condition not expressed in this Agreement shall be binding upon the
parties hereto or shall affect or be effective to interpret, change or restrict
the provisions of this Agreement. This Agreement is intended to supersede Rider
4 of the Lease in its entirety.

     Executed to be effective as of the date set out above.

                         DALMAC/GOLDCOR REAL ESTATE VENTURE, LTD.,
                         a Texas limited partnership

                         By:  DALMAC SHILOH, LTD.,
                              a Texas limited partnership

                              By:  DalMac Real Estate, Inc.,
                                   a Texas corporation,
                                   Its General Partner

                                   By:  /s/ Randall Hearne
                                      --------------------------
                                        Name:  Randall Hearne
                                             -------------------
                                        Title:  Treasurer
                                              ------------------

                          PANJA INC., a Texas corporation

                          By:  /s/ Joe Hardt
                             -----------------------------------
                               Name:  Joe Hardt
                                    ----------------------------
                               Title:  President & CEO
                                     ---------------------------

OPTION AGREEMENT - Page 6
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     Shiloh III is joining in the execution of this Agreement solely for the
purpose of indicating its awareness of the same and its agreement under the
limited circumstances contained in Paragraph 2 above to modify the Lease to the
extent it is still the Landlord under the Lease.

                              DALMAC/GOLDCOR PROJECT NO. SHILOH III, LTD.,
                              a Texas limited partnership

                              By:  DALMAC SHILOH-GOLD III, LTD.,
                                   A Texas limited partnership

                                   By:  DALMAC SHILOH III, INC.,
                                        A Texas corporation,
                                        General Partner

                                        By:  /s/ Randall Hearne
                                           ----------------------------
                                             S. Randall Hearne
                                             Secretary/Treasurer

OPTION AGREEMENT - Page 7<PAGE>

                                                                   Exhibit 10.13

                      SECOND AMENDMENT TO LEASE AGREEMENT
                      -----------------------------------

     This Second Amendment to Lease Agreement ("Amendment") is dated effective
                                                ---------
as of the 1/st/ day of May, 2001, by and between DALMAC/GOLDCOR PROJECT NO.
SHILOH III, LTD., a Texas limited partnership ("Landlord") and PANJA INC., a
                                                --------
Texas corporation ("Tenant").
                    ------

                               R E C I T A L S:

     WHEREAS, DalMac/GoldCor Real Estate Venture, Ltd., a Texas limited
partnership, and Tenant did enter into that certain Lease Agreement dated
November 22, 1999, as subsequently amended by that certain First Amendment to
Lease Agreement (the "Amendment") dated as of January 10, 2000, and as further
                      ---------
amended by an Option Agreement (the "Option") dated October 1, 2000
                                     ------
(collectively, the Lease Agreement, the Amendment and the Option are referred to
herein as the "Lease"); and
               -----

     WHEREAS, the Lease contemplated, pursuant to Rider 3, that the Base Rental
be calculated and adjusted upon the completion of the initial construction
following the Commencement Date, and by their execution of this Second Amendment
the parties hereto desire to set forth their agreed calculations; and

     WHEREAS, during the course of the initial construction, at the request of
Tenant, Landlord expended monies for portions of the Additional Tenant Finish
Allowance, and the parties desire to reflect their understanding of the
remaining obligations of Landlord as to the Additional Tenant Finish Allowance.

     NOW, THEREFORE, for Ten Dollars ($10.00) and other good and valuable
consideration, the receipt, sufficiency and adequacy of each of which is hereby
expressly acknowledged, the parties hereto do hereby agree as follows:

     1.   Base Rental. As a result of the agreed calculations calculated by the
          -----------
parties, the Base Rental has been adjusted from $1,496,299.24 to $1,490,929.71,
with the monthly installments being adjusted from $124,691.60 to $124,244.14
effective on the Commencement Date. Commencing on the fifth (5th) anniversary
date of the Commencement Date until the last day of the calendar month in which
the tenth (10th) anniversary of the Commencement Date occurs, an amount per
annum equal to $1,640,022.68 payable in equal monthly installments of
$136,668.55 each. To the extent that Landlord, at the request of Tenant,
hereafter expends the balance of the Additional Tenant Finish Allowance as
described below, the Base Rental calculations set forth in this Paragraph 1
                                                                -----------
shall be increased by multiplying the Additional Tenant Finish Allowance then
expended by 10.10% and adding such increase to the Base Rental figures set forth
above. By further agreement of the parties, Rider 3 to the Lease is hereby
                                            -------
deleted in its entirety from the Lease, and each party shall remove such Rider 3
                                                                         -------
from all file copies of the Lease.

     2.   Option. As a result of the execution of the Option referenced above,
          ------
the parties agree that Rider 4 to the Lease is deleted in its entirety and the
Option Agreement substituted in its stead, and each party will remove Rider 4
                                                                      -------
from all file copies of the Lease.

     3.   Additional Tenant Finish Allowance. As a result of Tenant's request
          ----------------------------------
that Landlord expend portions of the Additional Tenant Finish Allowance prior to
the Commencement Date, the parties agree
<PAGE>

that notwithstanding any provisions in the Lease to the contrary, the maximum
amount of money that Landlord is obligated to make available to Tenant for the
completion of the 30,000 square foot pod and Additional Tenant Finish Allowance
is $752,549.00, not $900,000.00. Notwithstanding any provisions in the Lease and
in particular in Rider 2 to the Lease, Landlord's sole obligation for additional
                 -------
allowances or Additional Tenant Finish Allowances are expressly limited to
$752,459.00.

     4.   Acceptance of the Premises. By its execution hereof, Tenant confirms
          --------------------------
its prior acceptance of the Premises and satisfaction of all initial
construction and punch list obligations of Landlord and of the various
construction accountings required to calculate Base Rental and the Additional
Tenant Finish Allowance obligations under the Lease.

     5.   Miscellaneous. Except as expressly modified herein, all remaining
          -------------
terms and conditions of the Lease Agreement shall remain in full force as set
forth therein. Terms and provisions as utilized herein shall have the same
meaning and effect as used in the Lease Agreement unless expressly modified
herein.

     6.   Facsimile Signatures. For purposes of this Assignment, the parties
          --------------------
agree that they will accept and rely upon facsimile transmission and execution
of this Assignment to be binding upon each other. To the extent the parties
choose to rely upon execution by facsimile execution and transmission of this
Assignment, the parties shall cause "ink signed originals" of the Assignment to
be executed and distributed to each of the parties.

     7.   Counterparts. This Assignment may be executed in multiple counterparts
          ------------
(each of which is to be deemed an original for all purposes).

     EXECUTED as of the day and year first above written.

                              LANDLORD:
                              --------

                              DALMAC/GOLDCOR PROJECT NO. SHILOH
                              III, LTD., a Texas limited partnership

                              By:  DALMAC SHILOH-GOLD III, LTD.,
                                   A Texas limited partnership

                                   By:  DALMAC SHILOH III, INC.,
                                        A Texas corporation,
                                        General Partner

                                        By:  /s/ S Randall Hearne
                                           ---------------------------
                                              S. Randall Hearne,
                                              Secretary/Treasurer

                              TENANT:
                              ------
<PAGE>

                              PANJA INC.,
                              a Texas corporation

                              By:  /s/ Paul D. Fletcher
                                 -------------------------------------
                                   Name: Paul D. Fletcher
                                        ------------------------------
                                   Title: Vice President & CFO
                                         -----------------------------

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