Exhibit 10.5

The convertible note represented hereby is not transferable. The common
shares issuable upon conversion of the convertible note are not transferable
in the Province of Alberta prior to January 8, 1998 except pursuant to a
prospectus exemption pursuant to applicable securities legislation or an
order of the applicable securities commission. The securities represented
hereby may be subject to additional restrictions or resale and in Canadian
jurisdictions other than Alberta, the securities represented hereby may be
subject to hold periods of indefinite duration. Investors must consult their
own legal advisers prior to resale.

This convertible note and the common shares to be issued upon the conversion
thereof have not been registered under the United States Securities Act of
1933, as amended (the "1933 Act"), or the securities laws of any state or
jurisdiction of the United States. The securities represented hereby have not
been qualified pursuant to a prospectus in any Canadian jurisdiction. The
convertible note may not be exercised by or on behalf of a person in the
United States or by a U.S. Person unless registered under the 1933 Act and
the applicable securities laws of any state or an exemption from such
registration is available. "United States" and "U.S. Person" are as defined
by Regulation S under the 1933 Act.

                            TOMAHAWK CORPORATION
          (Incorporated under the laws of the Province of Alberta)

                   U.S. $250,000 AMENDED CONVERTIBLE NOTE
                             DUE JANUARY 8, 2001

TOMAHAWK CORPORATION, (the "Corporation"), for value received hereby promises
to pay to NORMAN SIEGEL, 1836 N. SEDGWICK, CHICAGO, ILLINOIS, USA, 60614 (the
"Holder") or to his heir, successor or assign who becomes the registered
Holder hereof, on (or, at the option of the Corporation, before) January 8,
2001, on presentation and surrender of this Note at the head office of the
Corporation at 9591 Waples Street, San Diego, California, USA (or such other
office as the Corporation shall subsequently advise the Holder of in
writing), the sum of TWO HUNDRED FIFTY THOUSAND DOLLARS in lawful money of
the United States of America (U.S. $250,000).

PAYMENT OF INTEREST

The Corporation hereby promises to pay to the Holder, interest on the
principal ("Principal") being, U.S. $250,000 or such lesser amount of
principal balance hereof which shall from time to time be outstanding and
unpaid pursuant to this Note after giving effect to one or more partial
repayments, redemptions or conversions as permitted and contemplated herein.
Interest shall be calculated at the rate of 1% above the index rate as
established and announced from time to time by the Bank of America, Chicago,
Illinois, (which rate may not be the lowest rate of interest charged by Bank
of America to its customers) such interest to be calculated from December 31,
1996 to January 8, 2001. Changes in the index rate shall take effect on the
date set forth in each such announcement by the Bank of America of such
change. Interest shall be payable and required to be paid monthly on the first
day of each and every month and shall be calculated on the basis of the
actual number of days elapsed over a year of 360 days but shall not exceed
the maximum rate of interest allowable under applicable law for loans of this
type. Principal due hereunder shall bear interest after maturity, whether
pursuant to acceleration, expiration of the term of this Note or otherwise at
3% per annum over the prematurity rate.

As interest on this Note becomes due, the Corporation (except in case of
payment at maturity or on conversion at which time payment of interest will
be made upon surrender of this Note) shall forward or cause to be forwarded
by ordinary post to the office of the Holder at 1836 N. Sedgwick, Chicago,
Illinois, USA, 60614 (or such other office as the Holder shall advise the
Corporation in writing), a cheque or bank draft drawn on the Corporation's
bankers for such interest, less any tax required by law to be paid.

Notwithstanding anything herein to the contrary, the Holder shall never be
entitled to charge, take or receive as interest any amount in excess of the
maximum rate of interest permitted by law. If the Holder shall receive
documents in excess of such maximum permitted rate, such excess shall be
applied to unpaid principal hereunder, or if no principal remains unpaid,
refunded to the Corporation.

Unless otherwise agreed to by the parties and consented to by any applicable
securities regulatory bodies, including The Alberta Stock Exchange, all
interest on principal, interest on unpaid interest or any other interest or
other


payments due or payable pursuant to this Note, other than payment of the
Principal shall be payable in cash money and shall not be payable in Common
Shares of the Corporation.

CONVERSION OF NOTE

Subject to the section entitled "Adjustments" herein, this Note is
convertible, at the option of the Holder, in whole or in part, in one or more
parts, at any time and from time to time on or before JANUARY 8, 2001, in
such amounts as the Holder may elect, into fully paid and non-assessable
common shares ("Common Shares") in the capital of the Corporation as presently
constituted (without adjustment for dividends on shares issuable upon
conversion) at a conversion rate of U.S. $0.1695 PER SHARE (being Cdn. $0.23
per share as at the date August 26, 1996, being the date such price was fixed
with The Alberta Stock Exchange, based on a U.S./Cdn. dollar exchange rate of
1.3566) up to an aggregate maximum of 1,474,565 Common Shares.

In order to exercise the conversion privilege, the Holder shall surrender
this Note to the Corporation at its head office, accompanied by written
notice (which shall be irrevocable) signed by the Holder stating that he
elects to convert all or a portion of this Note into common shares, and such
notice shall clearly state the number of Common Shares to be subscribed for.
Such notice shall also state the name or names in which the certificates form
Common Shares shall be issuable upon such conversion and shall include the
addresses of such person(s) so named.

If any of the Common Shares into which this Note is to be converted are to be
issued to a person or persons other than the Holder of this Note, such notice
shall be accompanied by payment to the Corporation of any transfer or other
tax which may be payable by reason thereof. The surrender of this Note
accompanied by such written notice shall be deemed to constitute a contract
between the Holder and the Corporation whereby:

          (i)     the Holder subscribes for the number of Common Shares which
          he shall be entitled to receive on such conversion;

          (ii)    the Holder releases the Corporation from any and all
          liability thereon or the portion thereof which is converted, as the
          case may be, and agrees to execute such discharge and/or such other
          documents as the Corporation may reasonably request or require;

          (iii)   the Corporation agrees that the surrender of this Note for
          conversion constitutes full payment of the subscription price for
          the Common Shares issuable upon such conversion; and

          (iv)    the Corporation agrees upon each conversion in whole or in
          part of the Note to forthwith issue and cause to be delivered both
          a new note representing the balance of the indebtedness not
          converted and certificates representing that number of fully paid
          and non-assessable Common Shares as have been converted and
          subscribed.

ENFORCEABILITY

The whole of the Principal herein referred to shall become forthwith due and
payable, upon the happening of any one or more of the following events:

     (i)     if the Corporation makes default in payment of the Principal of
     this Note when the same becomes due;

     (ii)    if the Corporation makes default in payment in money of any
     interest due on any interest payment date and such failure shall have
     continued for a period of 90 days after the default of such payment;

     (iii)   if the Corporation makes a declaration of bankruptcy, a receiver
     or receiver-manager is appointed, or if any steps are taken for the
     winding up or liquidation of the Corporation or if the Corporation makes
     a general assignment for the benefit of its creditors;

     (iv)    if the Corporation neglects to observe or perform any covenant
     or condition of this Note and the Corporation fails to remedy such
     neglect within 90 days after receipt of a written notice from the Holder
     requiring the Corporation to remedy such neglect; or

     (v)     in the event of default under the Security Agreement referred to
     under the heading "Other Agreements and Security" herein.

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REPAYMENT AND REDEMPTION

The Corporation may, without penalty or premium, at any time and from time to
time on or before January 8, 2001, repay the total or any part of the
Principal upon payment of accrued interest to the date of such repayment. The
Corporation agrees upon each redemption in whole or in part of the Note to
forthwith issue and cause to be delivered a new Note representing the balance
of the indebtedness not repaid. If this Note is actually redeemed in full by
the Corporation it shall be cancelled and shall not be reissued.

TRANSFERABILITY

This Note is non-transferable. The transfer of any Common Shares resulting
from the conversion of this Note shall be subject to and restricted by the
provisions of applicable securities legislation. THE COMMON SHARES ISSUABLE
UPON CONVERSION OF THE NOTE ARE NOT TRANSFERABLE IN THE PROVINCE OF ALBERTA
UNTIL JANUARY 8, 1998 AND IN OTHER CANADIAN JURISDICTIONS MAY BE SUBJECT TO
AN INDEFINITE HOLD PERIOD. THE CERTIFICATES REPRESENTING THE SECURITIES
REFERRED TO HEREIN WILL BE LEGENDED WITH APPLICABLE HOLD PERIODS. HOLDERS ARE
ADVISED TO CONSULT THEIR OWN LEGAL COUNSEL IN THIS REGARD.

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED
STATES SECURITIES ACT OF 1933, AS AMENDED (THE "U.S. SECURITIES ACT"). THE
HOLDER HEREOF, BY PURCHASING SUCH SECURITIES, AGREES FOR THE BENEFIT OF THE
CORPORATION THAT SUCH SECURITIES MAY BE OFFERED, SOLD OR OTHERWISE
TRANSFERRED ONLY (A) TO THE CORPORATION, (B) OUTSIDE THE UNITED STATES IN
ACCORDANCE WITH RULE 904 OF REGULATION S UNDER THE U.S. SECURITIES ACT, (C)
PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE U.S. SECURITIES ACT
PROVIDED BY RULE 144 THEREUNDER, IF APPLICABLE, AND IN ACCORDANCE WITH
APPLICABLE STATE SECURITIES LAWS OR (D) WITH THE PRIOR WRITTEN CONSENT OF THE
CORPORATION, PURSUANT TO ANOTHER APPLICABLE EXEMPTION UNDER THE U.S.
SECURITIES ACT OR THE REGULATIONS OR POLICIES PROMULGATED THERETO AND ANY
APPLICABLE STATE SECURITIES LAWS. DELIVERY OF THIS CERTIFICATE MAY NOT
CONSTITUTE GOOD DELIVERY IN SETTLEMENT OF TRANSACTIONS ON STOCK EXCHANGES IN
CANADA. DELIVERY OF WHICH WILL CONSTITUTE GOOD DELIVERY, MAY BE OBTAINED
FROM THE REGISTRAR AND TRANSFER AGENT UPON DELIVERY OF THIS CERTIFICATE AND A
DULY EXECUTED DECLARATION, IN A FORM SATISFACTORY TO THE REGISTRAR AND
TRANSFER AGENT AND THE CORPORATION, TO THE EFFECT THAT THE SALE OF THE
SECURITIES REPRESENTED HEREBY IS BEING MADE IN COMPLIANCE WITH RULE 904 OF
REGULATION S UNDER THE U.S. SECURITIES ACT. THE HOLDER BY PURCHASING SUCH
SECURITIES AGREES FOR THE BENEFIT OF THE CORPORATION THAT THE CORPORATION HAS
NO MADE NO REPRESENTATION AS TO THE AVAILABILITY OF AN APPLICABLE EXEMPTION.

OTHER AGREEMENTS AND SECURITY

Each of the parties indicated on the last page hereof, acknowledge and agree
that this Convertible Note is intended to and does revoke, replace and
supersede the Secured Promissory Note dated November 19, 1996 between
TomaHawk II, Inc., the Corporation's wholly owned subsidiary and the Holder.
Notwithstanding the foregoing, and in limitation thereof, the parties
acknowledge and agree that that certain Security Agreement dated November 19,
1996 between TomaHawk II, Inc. and the Holder hereof shall continue in full
force and effect and the terms and conditions of which are incorporated by
reference herein and the amounts owing hereunder continue to be secured as
set forth in such Security Agreement. Without limiting the generality of the
foregoing and for greater certainty, any choice of laws or conflict of laws
provisions in said Security Agreement shall continue to govern the
interpretation and enforcement of such Security Agreement.

NO RIGHTS OF SHAREHOLDER UNTIL CONVERSION

The Holder shall have no rights whatsoever as a shareholder (including any
right to receive dividends or other distribution to shareholders or to vote
or attend at a general or other meeting of the shareholders of the
Corporation), other than in respect of Common Shares which the Holder shall
have exercised his right to convert hereunder and which the Holder shall have
actually converted pursuant to the terms hereof and paid for or in respect of
such other securities of the Corporation which the Holder may own. Holders
shall be bound by any resolution passed at a meeting of the shareholders of
the Corporation held in accordance with the provisions of the BUSINESS
CORPORATIONS ACT (Alberta).


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NO FRACTIONAL COMMON SHARES

No fractional Common Shares will be issued upon conversion of the Note, nor
shall any compensation be made for such fractional Common Shares, if any. To
the extent that the Holder would otherwise be entitled to purchase a fraction
of a Common Share, such right may be exercised in combination with other
rights which, in the aggregate, entitles the Holder hereof to purchase a
whole number of Common Shares. Any fractional Common Shares shall be rounded
downwards to the next whole number.

ADJUSTMENT

If prior to January 8, 2001 or conversion or repayment or redemption in full
of the Note evidenced herein, the Corporation shall at any time arrange or
merge into another corporation, or if there is a subdivision, consolidation
or other reclassification of the shares of the Corporation, the Holder will
thereafter receive, upon the conversion of the Note evidenced herein, the
securities or properties to which a holder of the number of shares then
deliverable upon the exercise of the Note would have otherwise been entitled
to receive immediately prior to such arrangement, merger, subdivision,
consolidation or other reclassification. The Corporation shall take steps as
may be necessary to assure that the provisions hereof shall thereafter be
applicable, in relation to any securities or property thereafter deliverable
upon the conversion of the Note evidenced herein. A sale of all or
substantially all of the assets of the Corporation for consideration (apart
from the assumption of obligations), constituting securities shall be deemed
to be an arrangement or merger for the foregoing purposes.

MISCELLANEOUS

If this Note or any replacement or additional Note certificate is lost,
mutilated, destroyed or stolen, the Corporation may, on such reasonable terms
as to cost and indemnity or otherwise as they may impose, respectively issue
a replacement Note certificate similar as to denomination, tenor and date as
the Note certificate so lost, mutilated, destroyed or stolen.

THE NOTE AND THE COMMON SHARES ISSUABLE UPON EXERCISE OF THE NOTE ARE NOT
QUALIFIED FOR SALE OR REGISTERED UNDER THE LAWS OF ANY PROVINCE, TERRITORY,
STATE OR PURSUANT TO THE LAWS OF THE UNITED STATES. COMPLIANCE WITH THE
APPLICABLE SECURITIES LEGISLATION IS THE RESPONSIBILITY OF THE HOLDER AND THE
HOLDER OF COMMON SHARES.

The Note represented hereby shall be governed by the laws in force in the
Province of Alberta. If any provision of this Note shall be prohibited or
invalid under applicable law, such provision shall be ineffective to the
extent of such prohibition or invalidity without invalidating the remainder
of such provision or the remaining provisions of this Note.

TIME SHALL BE OF THE ESSENCE.

No delay on the part of the Holder hereof in the exercise of any right or
remedy shall operate as a waiver thereof; no single or partial exercise by
the Holder of any right or remedy shall preclude any other future exercise
thereof of the exercise of any other right or remedy; no waiver or indulgence
by the Holder of any default shall be effective unless in writing and signed
by the Holder hereof and no waiver or one occasion shall be construed as or
be a bar to or a waiver of the enforcement of such right or the exercise of a
remedy on a future occasion.

The Corporation and TomaHawk II, Inc. hereby consent to any extension or
postponement of the time for payment hereunder and the release of any
security interest securing this Note; or the addition of any party hereto; or
the release or discharge of, or suspension of any rights or remedies against
the Corporation or TomaHawk II, Inc., or any person who may be liable for the
payment of the indebtedness evidenced hereby.


                                  4



IN WITNESS WHEREOF the Corporation has authorized its duly authorized officer
to execute and deliver this certificate effective the ___ day of ________, 1999.

                                          TOMAHAWK CORPORATION

                                          By: /s/ S. M. Caira
                                              ---------------------------------
                                              Steven M. Caira, President, CEO
                                              and director

Acknowledged and agreed to this __day     Acknowledged and agreed to by NORMAN
of _______, 1999 by TOMAHAWK              SIEGEL this 25 day of February, 1999.
II, INC. in the presence of:                          --        --------


/s/ S. M. Caira                           /s/ Norman Siegel
- ------------------------------------      -------------------------------------
Steven M. Caira, President and director   [signature of Norman Siegel]
as evidenced by affixing of the
corporate seal of TomaHawk II, Inc.

                                          -------------------------------------
                                          [witness to signature of Mr. Siegel]


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c/s




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