Document:

Exhibit 10.233

                              CONSULTING AGREEMENT

      THIS CONSULTING AGREEMENT (this "Agreement") effective as of January 1,
1998, between Chancellor of Stuart, Inc. (the "Company"), and CareMatrix of
Massachusetts, Inc., a Delaware corporation (the "Consultant").

      WHEREAS, the Company desires to retain the Consultant to perform certain
consulting services for the Company, and the Consultant desires to be retained
by the Company; and

      WHEREAS, the Company and the Consultant desire to set forth the terms and
conditions on which the Consultant shall be retained by and provide services to
the Company.

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

      1. Consulting Services. During the term of this Agreement, the Consultant
shall provide consulting services and assistance with respect to the
construction of the senior housing facility owned and/or operated by the
Company.

      2. Consulting Fees and Expenses. The Company shall pay to the Consultant a
consulting fee of Twenty Thousand ($20,000.00) Dollars per month (the
"Consulting Fee").

      3. Term. The initial term of this Agreement shall commence effective on
the date hereof (the "Effective Date") and continue for a period of twenty-four
(24) months, and shall be renewable upon ninety (90) days prior notice from the
Company to the Consultant for an additional twelve (12) month period at the
option of the Company. Notwithstanding the foregoing, either the Company or the
Consultant may terminate this Agreement at any time after the Effective Date for
any reason by providing thirty (30) days prior written notice of such intention
to terminate to the other party.

      4. Independent Contractor. The Consultant is and shall be an independent
contractor hereunder and the officers, directors and employees of the Consultant
are not and shall not be an employee of the Company by virtue of this Agreement.
Neither the Consultant nor the Company shall hold the Consultant out as an
agent, partner, officer, director, or other employee of the Company and the
Consultant further specifically disclaims any and all rights to an equity
interest in or a partnership interest with the Company. The Consultant
specifically acknowledges and agrees that this

<PAGE>

Agreement shall not give the Consultant authority to execute any contracts or
agreements on behalf of the Company or its Affiliates and nor authority to bind
the Company or its Affiliates to any obligation (contractual or otherwise). The
Consultant shall devote such of its time, energy and skill as is reasonably
necessary to perform the services described in Paragraph 1 above.

      5. Indemnity. The Consultant shall indemnify and hold harmless the Company
from and against all claims, losses, costs, damages and expenses including,
without limitation, attorneys' fees and costs resulting from or arising in
connection with any negligence or intentional or willful misconduct by the
Consultant in the performance of Consultant's duties under this Agreement.

      6. Entire Agreement. This Agreement represents the entire understanding
and agreement between the parties with respect to the subject matter hereof, and
supersedes all other negotiations, understandings and representations (if any)
made by and between such parties. The provisions of this Agreement may not be
amended, supplemented, waived or changed orally, but only by a writing signed by
the party as to whom enforcement of any such amendment, supplement, waiver or
modification is sought and making specific reference to this Agreement.

      7. Assignment. The Consultant may not assign or delegate its rights and/or
obligations hereunder, provided, however, the Consultant may assign its right to
receive fees or other compensation hereunder the any lender of the Consultant.
The Company may assign its rights hereunder to any of its Affiliates but shall
remain primarily liable hereunder absent a written release executed by the
Consultant.

      8. Severability. If any part of this Agreement or any other agreement
entered into pursuant hereto is contrary to, prohibited by or deemed invalid
under applicable law or regulation, such provision shall be inapplicable and
deemed omitted to the extent so contrary, prohibited or invalid, but the
remainder hereof shall not be invalidated thereby and shall be given full force
and effect so far as possible.

      9. Notices. All notices, requests, consents and other communications
required or permitted under this Agreement shall be in writing and shall be (as
elected by the person giving such notice) hand delivered by messenger or courier
service, delivered by a nationally recognized overnight delivery service, or
mailed by registered or certified mail (postage prepaid), return receipt
requested, addressed to:

                                       2
<PAGE>

If to the Consultant:                     If to the Company:

CareMatrix of Massachusetts, Inc.         Chancellor of Stuart, Inc.
197 First Avenue                          197 First Avenue
Needham, MA 02494                         Needham, MA 02494
Attn: CEO                                 Attn: President

or to such other address as any party may designate by notice complying with the
terms of this Section. Each such notice shall be deemed delivered (a) on the
date delivered if by personal delivery, or (b) on the date upon which the
receipt is signed or delivery is refused or the notice is designated by the
postal authorities or delivery service as not deliverable, as the case may be,
if delivered by overnight delivery or mailed.

      10. Waivers. The failure or delay of any party at any time to require
performance by another party of any provision of this Agreement, even if known,
shall not affect the right of such party to require performance of that
provision or to exercise any right, power or remedy hereunder, and any waiver by
any party of any breach of any provision of this Agreement should not be
construed as a waiver of any continuing or succeeding breach of such provision,
a waiver of the provision itself, or a waiver of any right, power or remedy
under this Agreement. No notice to or demand on any party in any case shall, of
itself, entitle such party to any other or further notice or demand in similar
or other circumstances.

      11. Governing Law. This Agreement and all transactions contemplated by
this Agreement shall be governed by, and construed and enforced in accordance
with, the internal laws of the Commonwealth of Massachusetts without regard to
principles of conflicts of laws.

      12. Definitions: For purposes of this Agreement, the following terms shall
have the meanings set forth below:

      12.1. "Affiliate" shall mean, with respect to a Person, any other Person
            that, directly or indirectly through one or more intermediaries,
            controls, is controlled by or is under common control with such
            first Person. For purposes of this Agreement, the term "control"
            shall mean the possession, direct or indirect, of the power to
            direct or cause the direction of the management and policies of a
            Person, whether through the ownership of voting securities, by
            contract or otherwise.

      12.2. "Person" shall mean an individual, partnership, corporation, limited
            liability Company, trust, joint venture or other entity.

                                       3
<PAGE>

      IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the day and year first set forth above.

Signed in the                       CHANCELLOR OF STUART, INC.
Presence of:
                                    By: /s/ Abraham D. Gosman
-----------------------------           ---------------------
Print Name:                             Name:
           ------------------           Title:

                                    CAREMATRIX OF MASSACHUSETTS, INC.

                                    By: /s/ Michael J. Zaccaro
-----------------------------           ----------------------
Print Name:                         Name:
           ------------------       Title:

                                       4<PAGE>

                                                                   EXHIBIT 10.15

OmniVision Technologies, Inc
930 Thompson Place
Sunnyvale, CA 94086

Gentlepersons,

     This letter ("Letter") will confirm the terms of our agreement for the
purchase by Creative Technology Ltd. and its affiliates and subsidiaries
(collectively, "Creative") of OmniVision's 0V7610 sensor ("Sensor") and 0V511
compression chip ("Chip") (collectively, the "Product"). The terms and
conditions contained in this Letter shall govern the purchase and sale of
Product and are intended to supplement the terms and conditions set forth in the
purchase orders for the Products ("Purchase Order"), a current sample of which
is attached hereto as Exhibit A. The terms of the then current Purchase Order
are herein incorporated by reference and shall be binding on both parties;
provided, however, that to the extent the terms of the then current Purchase
Order conflict or are inconsistent with the terms of this Letter, the terms of
this Letter shall govern.

1.   Term. The term of this Letter shall be three (3) years, commencing on the
--   ----
date this Letter is signed by both parties. In the event that either party
commits a material breach of its obligations hereunder and such breach remains
uncured for ten (10) calendar days after written notice to the breaching party,
the non-breaching party may immediately terminate this Letter in its entirety.
Notwithstanding such termination, outstanding Purchase Orders shall remain
subject to this Letter until filled.

2.   Forecasts. Once a month, Creative shall furnish a rolling, non-binding six-
--   ---------
week forecast of projected purchases of Products ("Forecast"), but any such
Forecast is for planning purposes only and does not constitute a commitment of
any type by Creative. Creative shall have no obligation to purchase any quantity
of Product beyond those specified in the First P.O., as defined below.

3.   Purchase Orders. Creative may purchase Products by issuing a Purchase Order
--   ---------------
no less than thirty (30) days from the required delivery, date for such order. A
Purchase Order represents Creative's obligation to buy, and OmniVision's
obligation to sell and deliver Product to Creative in the quantity set forth in
the Purchase Order so long as, and to the extent that, such quantity is within
*** of Creative's Forecast. Creative has the right to cancel any Purchase
Order, in whole or in part, if OmniVision fails to make deliveries in accordance
with the terms, including without limitation, the time schedule, set forth in a
Purchase Order.

     a.  First Purchase Order. OmniVision shall supply all Products ordered
     --  --------------------
under the Purchase Order, dated February 2, 1999, attached hereto as Exhibit B
("First P.O."). Fifteen Thousand units of each of the Sensor and the Chip
ordered under the First P.O. shall be received by Creative no later than March
23, 1999 and the remainder of the Products ordered under the First P.O. shall be
received by Creative no later than March 31, 1999 (March 23, 1999 and March 31,
1999 each hereinafter called a "Delivery Date"); provided, however, that
Creative may cancel or modify all or any part of the First P.O., at its
discretion, at any time prior to thirty days before a Delivery Date, or, within
thirty days of a Delivery Date, if: (1) Creative's product which incorporates
the Product ("Creative Product") fails Creative's internal testing procedures;
or (2) the Creative Product fails to pass FCC or CE approval in a timely
fashion. In the event that OmniVision cannot or does not meet the March 23, 1999
delivery date. Creative may terminate the First P.O. in part or in its entirety.
The price of Products ordered under the First P.O. shall be that set forth in
Section 4a herein.

     b.  February Purchase Order for Product Samples. In the month of February,
     --  -------------------------------------------
Creative intends to issue an additional Purchase Order for 150 units of each of
the Sensor and the Chip. Creative shall receive such Products within fourteen
(14) calendar day's from the date of such Purchase Order. The pricing for such
Products shall be that set forth in Section 4a herein.

*** Confidential treatment requested pursuant to a request for confidential
    treatment filed with the Securities and Exchange Commission. Omitted
    portions have been filed separately with the Commission.
<PAGE>

<TABLE>
<CAPTION>
4.   Pricing
--   -----------

     Prices for Products shall be as follows:                      Sensor        Chip
                                                                   -----------   ----------
     <S>                                                          <C>           <C>
     a. Products purchased under First P.O.:
          Receipt by Creative by applicable Delivery Date:         $***/unit   $***/unit
          Receipt by Creative after applicable Delivery Date:      $***/unit   $***/unit

     b. Subsequent Purchase Orders:
          Units 0 -- 25,000                                        $***/unit   $***/unit
          Units 25,001 and over.                                   $***/unit   $***/unit
</TABLE>

     Prices include all direct, indirect and incidental charges related to the
sale and delivery of the Product including, without limitation, packaging,
packing, storing, insurance costs, freight shipping charges, duties and charges
of any kind, and any and all sales, use, excise and similar taxes. F.O.B. point
is Creative, Singapore. Payment terms are net 45 days following date of receipt
of Product at the delivery destination provided by Creative.

5.   Engineer Resources and Support. OmniVision shall provide, at no charge (for
--   ------------------------------
either time expended or costs incurred, including, without limitation, travel
expenses), assistance in commercializing the Product as requested by Creative,
including, without limitation, technical assistance and engineering, resources
in the following areas: optical testing, FCC approval, and Creative's internal
testing procedures. Such assistance shall include, at a minimum, providing two
(2) engineers for two (2) weeks at Creative's Singapore facilities.

6.   Samples. OmniVision shall deliver, at no charge to Creative, twenty (20)
--   -------
samples of each of the Sensor and the Chip, no later than February 2, 1999.
OmniVision shall notify Creative as soon as possible of revisions to the
Product, and shall provide twenty (20) samples of each new revision as soon as
practicable, but in no event less than sixty (60) days prior to commercial
availability of such revisions.

7.   ***
--   -----

     a.  *** warrants that *** for *** shall be *** for *** regardless of *** or
any *** of any nature. If *** any *** than that *** shall *** to the *** for ***
on any *** from the *** on which the ***
     --

     b.  Product Availability. OmniVision warrants that in the event OmniVision
     --  --------------------
suffers a shortage of Product such that it will not be able to fill all of its
customers' orders, ***. OmniVision further warranty that it will immediately
notify Creative in writing, in the event it believes it will not be able to fill
a Creative P.O. in a timely fashion. Such notification will include, without
limitation, the reason for the failure to fill the P.O.

     c.  New Products. OmniVision shall notify Creative, ***, of its plans for
     --  ------------
new products. Prior to offering for sale any such new product, OmniVision will
first consult with Creative and allow Creative to place a purchase order for
such new product ***.

     d.  Audit Rights. Creative shall be entitled to have an independent auditor
     --  ------------
review OmniVision's records during reasonable business hours to determine
compliance with Section 7. In the event the auditor determines that OmniVision
has failed to comply with the terms of this Section 7, OmniVision shall be
responsible for paying the costs of the independent auditor review.

***   Confidential treatment requested pursuant to a request for confidential
      treatment filed with the Securities and Exchange Commission. Omitted
      portions have been filed separately with the Commission.
<PAGE>

8.   Warranties and Indemnities
--   --------------------------

     a.  Intellectual Property Warranty. OmniVision warrants that the Products
     --  ------------------------------
furnished hereunder and the sale, use or incorporation of the Products into a
Creative Product do not infringe or misappropriate any patent, copyright, trade
secret, trademark, publicity, privacy, or other rights of any person.

     b.  Product Warranty. OmniVision warrants that the Products shall be free
     --  ----------------
from defects in material, manufacturing, design and workmanship and shall
conform to their specifications for a period of fifteen (15) months from
Creative's receipt of Product ("Warranty Period"). In the event a Product has a
defect that constitutes a breach of this warranty, OmniVision shall use its best
efforts to repair the defect, or at Creative's option, (1) accept return of the
Product and provide a replacement of the same Product or (2) refund to Creative
the total amount paid by Creative to OmniVision for such Product.

     c.   Year 2000 Warranty. OmniVision warrants that each Product delivered
     --   ------------------
          hereunder accurately processes date/time data (including, but not
          limited to, calculating, comparing, and sequencing) from, into, and
          between the twentieth and twenty-first centuries, and the years 1999
          and 2000 and leap year calculations and when used in combination with
          other information technology, shall accurately process date/time data
          if the other information technology properly exchanges date/time data
          with it. OmniVision shall indemnify and hold Creative harmless from
          any damages, costs, liabilities or expenses, including attorneys' fees
          and other legal costs arising out of a breach of the above warranty
          and will use its best efforts to immediately correct any deficiencies
          relating thereto.

     d.  Indemnification. OmniVision shall hereby protect, defend, indemnify and
         ---------------
save Creative and its affiliates harmless from all liabilities, damages, and
losses, including without limitation, settlements, costs, and expenses
(including without limitation, attorneys fees and costs) which Creative or its
affiliates may incur or be obligated to pay as a result of any and all claims,
demands, causes of action or judgements of every nature whatsoever in favor of
any person or entity, arising out of or related to any breach of any warranty or
representation in this Letter or the Exhibits or resulting from OmniVision's
performance hereunder.

9.   Logos. OmniVision may include its logo on the Sensor, but shall under no
--   -----
circumstances identify the Chip with its logo or any other indication of its
source, other than lot and part number. OmniVision shall allow a space on the
Chip for inclusion of the Creative label.

10.  Non-Disclosure. OmniVision expressly acknowledges that the existence of any
---  --------------
relationship between it and Creative is highly confidential. OmniVision may not
use Creative's name in advertisements or press releases or otherwise disclose
the existence or content of this Letter or its relationship with Creative
without the prior written consent of a duly authorized officer of Creative.
Creative and OmniVision acknowledge that disclosures of either party's
confidential information under this Letter and the Exhibits shall be subject to
the terms and conditions of the non-disclosure agreement in place between the
parties dated February 19, 1998 ("Non-Disclosure Agreement") and attached hereto
as Exhibit C.

11.  Software License. OmniVision grants Creative a non-exclusive, irrevocable,
---  ----------------
royalty-free, worldwide, right and license to use all software required for the
proper operation and support of the Products (collectively, "Software") as set
forth in the Software license in place between the parties dated       , 1999
                                                                 ------
("Software License Agreement") and attached hereto as Exhibit D.

12.  Remedies.  The rights and remedies provided to Creative herein shall be
---  --------
cumulative and in addition to any other rights and remedies provided under the
Uniform Commercial Code, or otherwise at law or equity. OmniVision's sole remedy
in the event of breach of contract by Creative shall be the right

***   Confidential treatment requested pursuant to a request for confidential
      treatment filed with the Securities and Exchange Commission. Omitted
      portions have been filed separately with the Commission.
<PAGE>

to recover damages in an amount equal to the difference between market price to
third parties at the time of breach and contract price.

13.  Miscellaneous. This Letter, and the exhibits attached hereto, represent the
---  -------------
entire agreement with respect to the subject matter hereof and supersede all
prior discussions, proposals and agreements between the parties relating to the
subject matter hereof. This Letter and the exhibits (except as expressly set
forth in this Letter) can be modified only by a written amendment duly signed by
persons authorized to sign agreements on behalf of both parties and shall not be
supplemented or modified by any course of dealing or trade usage. This Letter
and the exhibits shall be interpreted and governed in all respects according to
the laws of the State of California, excluding its choice of law provisions.

Agreed to by:                             Agreed to by:

OMNIVISION TECHNOLOGIES, INC.             CREATIVE TECHNOLOGY LTD.

/s/ Robert J. Stroh
-------------------                       -----------------------
SIGNATURE                                 SIGNATURE

Robert J. Stroh
---------------                           -----------------------
PRINT NAME                                PRINT NAME

Vice President
--------------                            -----------------------
TITLE                                     TITLE

February 1, 1999
----------------                          -----------------------
DATE                                      DATE

***   Confidential treatment requested pursuant to a request for confidential
      treatment filed with the Securities and Exchange Commission. Omitted
      portions have been filed separately with the Commission.

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