Document:

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                                                                   EXHIBIT 10.44

                            INTERVISUAL BOOKS, INC.
                            AMENDMENT TO NONSTATUTORY
                             STOCK OPTION AGREEMENT

               THIS AMENDMENT (the Amendment) between INTERVISUAL BOOKS, INC., a
California corporation (the Company), and NATHAN NORMAN SHEINMAN (Employee) is
entered into as of the 31st day of January, 2000.

               Pursuant to a NONSTATUTORY STOCK OPTION AGREEMENT between the
Company and Employee entered into the l3th day of January, 1997 (the Agreement),
the Company granted to Employee an option to purchase 200,000 shares of the
Company's common stock. The Company and Employee desire to amend the Agreement
as provided for in this Amendment.

               NOW, THEREFORE, for good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

               1. The exercise price of $1.375 per share contained in the third
line of Section I of the Agreement is hereby amended to be $1.25 per share.

               2. The text of Section 4(d) of the Agreement is hereby deleted in
its entirety and replaced with the following:

               If Employee's employment is terminated for any reason other than
               as set forth in Sections 4(a), (b) and (c) above, Employee shall
               have one hundred eighty (180) days following the Date of
               Termination to exercise this option, but only to the extent that
               this option was exercisable on such Date of Termination."

               3 . Except as expressly modified or amended herein, the terms and
conditions of the Agreement remain in full force and effect; provided, however.
that in the event of a conflict between the provisions of the Agreement and the
provisions in this Amendment, the provisions in this Amendment shall control.

               IN WITNESS WHEREOF, this Amendment is executed as of the date
first written above.

                                            INTERVISUAL BOOKS, INC.

                                            By: /s/ WALDO H. HUNT
                                               ---------------------------------
                                            Name:     Waldo H. Hunt
                                            Title:    Chairman of the Board

                                            EMPLOYEE:

                                            /s/ NATHAN N. SHEINMAN
                                            ------------------------------------
                                            Nathan Norman Sheinman<PAGE>   1

                                                                   EXHIBIT 10.45

                            [INTERVISUAL LETTERHEAD]

Via: Overnight mail and Fax: 011-852-2664-7066

March 29, 2000

Zindart Limited
Flat C&D, 25/F., Block 1
Taiping Industrial Centre
57 Ting Kok Road
Tai Po, N. T.
Hong Kong
Attn: Feather S. Y. Fok

Re: EXTENSION NOTICE.

Dear Feather:

Please consider this notice that as per Section 2.6 of the Loan and Security
Agreement dated as of May 13, 1999, Intervisual Books, Inc. hereby extends the
committed revolving line until May 13, 2001 in the amount of $2,300,000.

Sincerely,

/s/ DAN REAVIS

Dan Reavis

Executive VP /CFO

cc:     ChinaVest
        Stephen Cooke, Paul Hastings, Janosfsky & Walker LLP<PAGE>   1
                                                        EXHIBIT 10.7

                                AMENDMENT NO. 2 TO
                                     TEKELEC
                              OFFICER SEVERANCE PLAN

        Section 2(f) of the Officer Severance Plan is hereby amended to read
in its entirety as follows:

        "'Eligible Officers' mean only those duly elected or appointed
officers of the Company that are expressly designated as 'Eligible Officers'
by the Board for the purposes of this Plan pursuant to resolutions duly
adopted by the Board."

Dated: February 4, 2000<PAGE>   1
                                                                   Exhibit 10.15

IT IS UNLAWFUL TO CONSUMMATE A SALE OR TRANSFER OF THIS SECURITY, OR ANY
INTEREST THEREIN, OR TO RECEIVE ANY CONSIDERATION THEREFOR, WITHOUT THE PRIOR
WRITTEN CONSENT OF THE COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA,
EXCEPT AS PERMITTED IN THE COMMISSIONER'S RULES.

                                  MINIMED INC.
                            1994 STOCK INCENTIVE PLAN

                               STOCK OPTION AWARD

     This Stock Option Award ("Award") is made as of the Date of Grant indicated
below by MiniMed Inc., a Delaware corporation (the "Company"), for the benefit
of the person named below as Grantee.

     WHEREAS, Grantee is a director, employee, consultant or adviser of the
Company and/or one or more of its subsidiaries; and

     WHEREAS, pursuant to the Company's 1994 Stock Incentive Plan (the "Plan"),
the Board of Directors of the Company (the "Board") or the Committee thereof
appointed by the Board to administer the Plan (the "Committee") has approved the
grant to Grantee of an option to purchase shares of the Common Stock, par value
$.01 per share, of the Company (the "Common Stock"), on the terms and conditions
set forth herein;

     NOW, THEREFORE, in consideration of the foregoing recitals and the
covenants set forth herein, the Company hereby agrees, and by accepting this
Award the Grantee agrees, as follows:

     1. Grant of Option; Certain Terms and Conditions. The Company hereby grants
to Grantee, as of the Date of Grant indicated below, an option to purchase the
number of shares of Common Stock indicated below (the "Option Shares") at the
Exercise Price per share indicated below, which option shall expire at 5:00
o'clock p.m., West Coast time, on the Expiration Date indicated below and shall
be subject to all of the terms and set forth in this Award (the "Option"). On
each anniversary of the Date of Grant, the Option shall become exercisable to
purchase that number of Option Shares (rounded to the nearest whole share) equal
to the total number of Option Shares multiplied by the Annual Vesting Rate
indicated below.

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     Grantee:

     Date of Grant:

     Number of shares purchasable:

     Exercise Price per share: $

     Expiration Date:

     Annual Vesting Rate:

The Option is not intended to qualify as an incentive stock option under Section
422 of the Internal Revenue Code.

     2. Termination of Option.

     (a) Termination of Employment or Arrangement.

          (i) Retirement. If Grantee shall cease to be a director or employee of
the Company or any of its subsidiaries or shall cease to be a consultant or
adviser to the Company or any of its subsidiaries, as determined by the
Committee (such event shall be referred to herein as the "Termination" of
Grantee's "Employment") by reason of Grantee's retirement in accordance with the
Company's or any applicable employer's then-current retirement policy
("Retirement"), then (A) the Option shall terminate on the earlier of the
Expiration Date or the date of such Retirement as to the number of shares for
which it has not then become exercisable and (B) the Option shall terminate as
to the number of shares for which it has then become exercisable upon the
earlier of the Expiration Date or 30 days after the date of such Retirement. The
date of Grantee's Retirement shall be the date Grantee ceases to provide
services to the Company regardless of whether Grantee continues on the Company's
payroll for some time thereafter; provided, however, that the Board may extend
said 30 day period for a period not to exceed one year but not in any event
beyond the Expiration Date.

          (ii) Death or Permanent Disability. If Grantee's Employment is
Terminated by reason of the death or Permanent Disability (as hereinafter
defined) of Grantee, then (A) the Option shall terminate on the earlier of the
Expiration Date or the date of such Termination as to the number of shares for
which it has not then become exercisable and (B) the Option shall terminate as
to the number of shares for which it has then become exercisable upon the
earlier of

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the Expiration Date or the first anniversary of the date of such Termination of
Employment. "Permanent Disability" shall mean the inability to engage in any
substantial gainful activity by reason of any medically determinable physical or
mental impairment which can be expected to result in death or which has lasted
or can be expected to last for a continuous period of not less than 12 months.
Grantee shall not be deemed to have a Permanent Disability until proof of the
existence thereof shall have been furnished to the Board in such form and
manner, and at such times, as the Board may require. Any determination by the
Board that Grantee does or does not have a Permanent Disability shall be final
and binding upon the Company and Grantee.

          (iii) Other Termination. If Grantee's Employment is Terminated for no
reason, or for any reason other than Retirement, death or Permanent Disability,
then (A) the Option shall terminate on the earlier of the date of the Expiration
Date or the date of such Termination as to the number of shares for which it has
not then become exercisable and (B) the Option shall terminate as to the number
of shares for which it has then become exercisable upon the earlier of the
Expiration Date or 30 days after the date of such Termination of Employment,
which Termination date shall be the date Grantee ceases to provide services to
the Company regardless of whether Grantee continues on the Company's payroll for
some time thereafter.

     (b) Death Following Certain Terminations of Employment. Notwithstanding
anything to the contrary in this Award, if Grantee shall die at any time after
the Termination of his or her Employment and prior to the earlier of the
Expiration Date or the date the Option would terminate as to shares for which it
is then exercisable pursuant to clauses (a) (i) or (iii) above, to the extent
that the Option was exercisable on the date of such death the Option shall
terminate on the earlier of the Expiration Date or the first anniversary of the
date of such death.

     (c) Other Events Causing Termination of Option. Notwithstanding anything to
the contrary in this Award, the Option shall terminate upon the consummation of
any of the following events:

          (i) the dissolution or liquidation of the Company; or

          (ii) a reorganization, merger or consolidation of the Company as a
result of which the outstanding securities of the class then subject to the
Option are exchanged for or converted into cash, property and/or securities not
issued by the Company unless provision is made in writing in connection with any
such transaction for the assumption of the Option or the substitution for the
Option of a new option covering the stock of a successor entity, or a parent or
subsidiary thereof, or of the Company, with appropriate adjustments as to the
number and kind of shares and price; or

          (iii) a sale of substantially all of the property and assets of the
     Company.

<PAGE>   4

     3. Adjustments. In the event that the outstanding securities of the class
then subject to the Option are increased, decreased or exchanged for or
converted into a different number or kind of shares or securities of the Company
as a result of a reorganization, merger, consolidation, recapitalization,
reclassification, stock dividend, stock split, reverse stock split or the like,
then, unless such event shall cause the Option to terminate pursuant to Section
2 (c) hereof or the terms of such transaction shall provide otherwise, the Board
or the Committee may make appropriate and proportionate adjustments in the
number and type of shares or other securities of the Company that may thereafter
be acquired upon the exercise of the Option; provided, however, that any such
adjustments in the Option shall be made without changing the aggregate Exercise
Price of the then unexercised portion of the Option.

     4. Exercise. Unless the Option is transferred as permitted by Section 8,
the Option shall be exercisable during Grantee's lifetime only by Grantee or by
his or her guardian or legal representative, and after Grantee's death only by
the person or entity entitled to do so under Grantee's last will and testament
or applicable intestate law. If the Option is transferred as permitted by
Section 8, the Option shall be exercisable by the transferee or, in the event of
the transferee's death, by the person or entity entitled to do so under the
transferee's last will and testament or applicable intestate law. The Option may
not be exercised with respect to any fractional share; cash shall be paid in
lieu of fractional shares. The Option may only be exercised by the delivery to
the Company of a written notice of such exercise, which notice shall be in a
form reasonably satisfactory to the Company and shall specify the number of
shares to be purchased (the "Purchased Shares") and the aggregate Exercise Price
for such shares (the "Exercise Notice"). By delivering the Exercise Notice, the
Grantee shall be deemed to have agreed to pay or cause to be paid, and shall so
pay or cause to be paid, in full such aggregate Exercise Price within five (5)
business days of receipt by the Company of the Exercise Notice. Such payment
shall be in cash or by wire transfer or check payable to the Company.

     As promptly as practicable following the receipt of an Exercise Notice
hereunder, the Company shall issue a stock certificate registered in the name of
the Grantee or his or her designee, representing the number of shares issued to
the Grantee upon exercise of the Option.

     5. Payment of Withholding Taxes. If the Company becomes obligated to
withhold an amount on account of any tax imposed as a result of the exercise of
the Option, including, without limitation, any federal, state, local or other
income tax, or any F.I.C.A., state disability insurance tax or other employment
tax, then, by exercising the Option Grantee shall be deemed to have agreed to
pay or cause to be paid, and shall pay or cause to be paid, such amount required
to be withheld in cash or by wire transfer or check, concurrently with paying
the cash portion of the Exercise Price or, if no portion of the Exercise Price
is being paid in cash, concurrently with the delivery of the Exercise Notice to
the Company.

<PAGE>   5

     6. Notices. All notices and other communications required or permitted to
be given pursuant to this Award shall be in writing and shall be deemed given if
delivered personally or five days after mailing by certified or registered mail,
postage prepaid, return receipt requested, to the Company at 12744 San Fernando
Road, Sylmar, California 91342, Attention: Corporate Secretary, or to Grantee at
the residence address of Grantee set forth in the records of the Company, or at
such other addresses as they may designate by written notice in the manner
aforesaid.

     7. Stock Exchange Requirements; Applicable Laws. Notwithstanding anything
to the contrary in this Award, no shares of stock purchased upon exercise of the
Option, and no certificate representing all or any part of such shares, shall be
issued or delivered if (a) such shares have not been admitted to listing upon
official notice of issuance on each stock exchange upon which shares of that
class are then listed or (b) in the opinion of counsel to the Company, such
issuance or delivery may cause the Company to be in violation of or to incur
liability under any federal, state or other securities law, or any requirement
of any stock exchange listing agreement to which the Company is a party, or any
other requirement of law or of any administrative or regulatory body having
jurisdiction over the Company.

     8. Limited Transferability. Neither the Option nor any interest therein may
be sold, assigned, conveyed, gifted, pledged, hypothecated or otherwise
transferred in any manner other than (i) by will or the laws of descent and
distribution, (ii) by gift to a family member, (iii) by a domestic relations
order to a family member in settlement of marital property rights, (iv) by
transfer to an entity in which more than fifty present of the voting interests
are owned by family members (or the Grantee) in exchange for an interest in that
entity or (v) by transfer to a trust for the sole benefit of the Grantee or any
of the foregoing. "Family member" means any child, stepchild, grandchild,
parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew,
mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law or
sister-in-law, including adoptive relationships, any person sharing the
Grantee's household (other than a tenant or employee), a trust in which these
persons (or the Grantee) have more than fifty percent of the beneficial
interest, a foundation in which these persons (or the Grantee) control the
management of assets, and any other entity in which these persons (or the
Grantee) own more than fifty percent of the voting interests. Except as set
forth in (iii), (iv) or (v) above, the Option cannot be transferred for value.
In the event of a transfer permitted by this Section 8 the transferee shall have
all of the rights and obligations of the Grantee under this Award, but all
references in Section 2 to the termination of the Option upon the termination of
Grantee's employment, retirement, death or permanent disability shall be deemed
to refer to those events as they affect Grantee and not to such events with
respect to the transferee and Grantee shall continue to be responsible to the
Company for all federal, state and local taxes payable as a result of the
exercise of the Option. In the event of such transfer, the transferee and
Grantee shall give written notice thereof to the Company, which notice shall
include the name, address and social security number of the transferee.

<PAGE>   6

     9. Plan. The Option is granted pursuant to the Plan, as in effect on the
Date of Grant, and is subject to all the terms and conditions of the Plan, as
the same may be amended from time to time; provided, however, that no such
amendment shall deprive Grantee, without his or her consent, of the Option or of
any of Grantee's rights under this Award. The interpretation and construction by
the Board or the Committee of the Plan, this Award, the Option and such rules
and regulations as may be adopted by the Board or the Committee for the purpose
of administering the Plan shall be final and binding upon Grantee. Until the
Option shall expire, terminate or be exercised in full, the Company shall, upon
written request therefor, send a copy of the Plan, in its then-current form, to
Grantee or any other person or entity than entitled to exercise the Option.

     10. Stockholder Rights. No person or entity shall be entitled to vote,
receive dividends or be deemed for any purpose the holder of any shares until
the Option shall have been duly exercised to purchase such Option Shares in
accordance with the provisions of this Award.

     11. Employment Rights. No provision of this Award or of the Option granted
hereunder shall (a) confer upon Grantee any right to continue in the employ of,
or in its current arrangement with, the Company or any of its subsidiaries, (b)
affect the right of the Company and each of its subsidiaries to terminate the
employment of Grantee, or such arrangement, with or without cause, or (c) confer
upon Grantee any right to participate in any employee welfare or benefit plan or
other program of the Company or any of its subsidiaries other than the Plan.
GRANTEE, IF HE OR SHE IS AN EMPLOYEE OF THE COMPANY OR ANY OF ITS SUBSIDIARIES,
HEREBY ACKNOWLEDGES AND AGREES THAT THE COMPANY AND EACH OF ITS SUBSIDIARIES MAY
TERMINATE THE EMPLOYMENT OF GRANTEE AT ANY TIME AND FOR ANY REASON, OR FOR NO
REASON, UNLESS GRANTEE AND THE COMPANY OR SUCH SUBSIDIARY ARE PARTIES TO A
WRITTEN EMPLOYMENT AGREEMENT THAT EXPRESSLY PROVIDES OTHERWISE.

     12. Governing Law. This Award and the Option granted hereunder shall be
governed by and construed and enforced in accordance with the laws of the State
of Delaware.

     13. Fair Market Value. The "Fair Market Value" of a share of Common Stock
or of a share of another class of capital stock of the Company on any day shall
be equal to the last sale price, regular way, of such a share on the business
day preceding such day or, in case no such sale takes place on such day and
there were sales within a reasonable period before the date for which the Fair
Market Value is to be determined, the mean between the lowest and highest sale
prices, regular way, on the nearest date before the date as of which the Fair
Market Value is to be determined, in either case as reported in the principal
consolidated transaction reporting system with respect to securities listed or
admitted to trading on the principal national securities exchange on which such
shares are listed or admitted to trading or, if such shares are not listed or
admitted to trading on any national securities exchange, the last quoted price,
or if not so quoted, the average of the high bid and low asked prices in the
over-the-counter market, as

<PAGE>   7

reported by the National Association of Securities Dealers, Inc. Automated
Quotations System or such other system then in use. If none of the foregoing
provisions for determining Fair Market Value are applicable, the Fair Market
Value will be determined by the Board or the Committee

     IN WITNESS WHEREOF, the Company has fully executed this Award as of the
Date of Grant.

                                   MINIMED INC.

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

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