Document:

<PAGE>

Exhibit 10.20

                          FOURTH MODIFICATION AGREEMENT
                                   (Mortgage)

      This Fourth Modification Agreement (the "Fourth Modification") is
effective as of this _____ day of October, 2000, between QUANTUM LEAP
COMMUNICATIONS, INC., a Delaware corporation, (hereinafter referred to as
"Mortgagor") and AMERICAN NATIONAL BANK AND TRUST COMPANY OF CHICAGO
(hereinafter referred to as "Mortgagee").

                               W I T N E S S E T H

      WHEREAS, on June 29, 1999, Mortgagor executed in favor of Mortgagee, a
certain Mortgage, as amended from time to time (the "Mortgage") subsequently
recorded on July 16, 1999 in the Recorder's Office of Cook County, Illinois as
Document Number 99681887, concerning the real property legally described in
Exhibit "A" attached thereto and incorporated therein. The Mortgage was given by
Mortgagor to secure, among other things, the payment to Mortgagee of: (i) that
certain Installment Note (Secured) dated June 29, 1999 in the principal sum of
TWO MILLION TWO HUNDRED FORTY THOUSAND AND NO/100 DOLLARS ($2,240,000.00) and
any amendments, modifications, extensions, renewals or replacements thereof (the
"Installment Note") executed by Mortgagor in favor of Mortgagee, and (ii) that
certain Promissory Note dated June 25, 1999 executed by Leapnet, Inc, YAR
Communications, Inc., Mortgagor and The Leap Partnership, Inc. jointly and
severally in favor of Mortgagee and evidencing an indebtedness in the current
principal amount of FIFTEEN MILLION AND NO/100 DOLLARS ($15,000,000.00), and any
amendments, modifications, extensions, renewals or replacements thereof (the
"Additional Note");

      WHEREAS, on June 29, 1999, Mortgagor also executed in favor of Mortgagee,
a certain Assignment of Real Estate Rents and Leases (the "Assignment")
subsequently recorded on July 16, 1999 in the Recorder's Office of Cook County,
Illinois as Document Number 99681888, further encumbering the real property
legally described in Exhibit "A" attached thereto and incorporated therein to
further secure the Installment Note and the Additional Note;

      WHEREAS, on October 4, 1999, Mortgagor executed in favor of Mortgagee, a
certain Modification Agreement (the "First Modification") subsequently recorded
on October 5, 1999 in the Recorder's Office of Cook County, Illinois as Document
Number 99942625 concerning additional real property legally described in Exhibit
"A" attached thereto and incorporated therein to further secure the Installment
Note and the Additional Note;

      WHEREAS, on October 4, 1999, Mortgagor executed in favor of Mortgagee, a
certain Second Modification Agreement (the "Second Modification") subsequently
recorded on October 5, 1999 in the Recorder's Office of Cook County, Illinois as
Document Number 99942628 concerning additional real property legally described
in Exhibit "A" attached thereto and incorporated therein to further secure the
Installment Note and the Additional Note;

      WHEREAS, on April 26, 2000, Mortgagor executed in favor of Mortgagee: (i)
that certain Amended and Restated Installment Note dated April 26, 2000 (said
Amended and Restated Installment Note, as amended or restated from time to time,
the "Amended and Restated Note") which amended and restated the Installment Note
to: (x) increase the principal amount of the Installment Note from Two Million
Two Hundred Forty and No/100 Dollars ($2,240,000.00) to Three Million Eight
Hundred Eighty Thousand and No/100 Dollars ($3,880,000.00), and (y) increase the
interest rate of the Installment Note from 8.5% per annum to 9.20% per annum,
and (ii) that certain Third Modification Agreement (the "Third Modification")
subsequently recorded on April, 28, 2000 in the Recorder's Office of Cook
County, Illinois as Document Number 00300061 concerning additional real property
legally described in Exhibit "A "attached thereto and incorporated therein to
secure the Amended and Restated Note;

                                       1
<PAGE>

      WHEREAS, Mortgagee is funding the third and final draw under the terms of
the Amended and Restated Note, which draw Mortgagor shall use to acquire the
real property commonly known as Unit 4 in Gibraltar Lofts, 420 West Huron
Condominium, 420 West Huron Street, Chicago, Illinois 60610 (the "Additional
Property"); and

      WHEREAS, the parties hereto have agreed upon a modification of the
Mortgage and the Assignment as herein set forth to secure Mortgagor's
obligations to Mortgagee under the Loan Documents (as such term is hereinafter
defined) with a first mortgage lien on the Additional Property.

      NOW THEREFORE, in consideration of the premises and the mutual promises
and agreements hereinafter made by and between the parties hereto, the said
parties do hereby mutually agree to further modify the Mortgage and the
Assignment as follows:

      1.    Mortgagor agrees that the real property encumbered by the Mortgage
            and the Assignment is described on Exhibit "A" attached hereto and
            made a part hereof.

      2.    Except as specifically amended in this Fourth Modification, the Loan
            Documents (as such term is hereinafter defined) shall remain in full
            force and effect, in accordance with their terms, conditions and
            provisions without change, modification or deletion.

      3.    All terms used herein and not otherwise defined shall have the
            respective meanings set forth in the Amended and Restated Note, the
            Mortgage and the Assignment.

      4.    This Fourth Modification shall be incorporated into and made a part
            of the Mortgage and the Assignment as amended, and all other related
            Loan Documents (as such term is hereinafter defined) executed by
            Mortgagor.

      5.    Mortgagor hereby agrees to execute and deliver, or cause to be
            executed and delivered, to Mortgagee such additional documentation
            as Mortgagee shall require in order to evidence or effectuate the
            transactions contemplated hereby or in order to update information
            and undertakings heretofore given to Mortgagee by or on behalf of
            Mortgagor.

      6.    This Fourth Modification shall be governed by, and construed in
            accordance with, the internal laws of the State of Illinois (other
            than those which pertain to conflicts of law), irrespective of the
            fact that one or more of the parties is or may become a resident of
            a different state.

      7.    This Fourth Modification shall inure to the benefit of Mortgagee's
            successors and assigns, and shall be binding upon the successors and
            assigns of Mortgagor.

      8.    This Fourth Modification may be executed in any number of
            counterparts, each of which shall be considered an original, and all
            of which, when taken together, shall constitute one and the same
            instrument.

      9.    Mortgagor: (i) reaffirms and remakes to Mortgagee all
            representations and warranties set forth in the Mortgage,
            Assignment, the Installment Note, the Additional Note, the Amended
            and Restated Note, the Security Agreement dated as of June 29, 1999
            executed by Mortgagor in favor of Mortgagee (the "Security
            Agreement") and any and all other loan documents executed by
            Mortgagor to evidence and secure such indebtedness as well as that
            certain Guaranty, dated June 29, 1999 and that certain Cross-Default
            Agreement dated June 29, 1999, each of which Leapnet, Inc. executed
            in favor of and delivered to Morgagee (all of the preceding
            documents, as amended, modified, restated or replaced from time to
            time, will be collectively referred to as the "Loan Documents"), and
            (ii) represents and warrants to Mortgagee that as of the date of
            this Fourth Modification no Event of Default exists under the Loan
            Documents, and Mortgagor is in full compliance will all of
            Mortgagor's obligations under the Loan Documents.

      10.   Mortgagor consents to the terms, provisions and conditions of this
            Fourth Modification and ratifies, confirms and approves the Loan
            Documents as clarified in this instrument, and each and every term,
            provision and condition herein contained, and acknowledges that they
            remain in full force and effect without offset in favor of
            Mortgagor, demand or counterclaim.

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      11.   Mortgagor agrees to pay, upon demand, all costs and expenses,
            including but not limited to, attorneys' fees and disbursements,
            incurred by Mortgagee in connection with this Fourth Modification.

      12.   MORTGAGOR IRREVOCABLY WAIVES ALL RIGHTS OF TRIAL BY JURY IN ANY
            ACTION, PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR IN CONNECTION
            WITH THIS FOURTH MODIFICATION OR ANY OTHER LOAN DOCUMENT OR
            ASSOCIATED MATTER.

      13.   Mortgagee, by entering into this Fourth Modification, is not waiving
            any rights it may have under the Loan Documents concerning any
            breach (whether or not currently matured) of Mortgagor under the
            Loan Documents, or of any matured or unmatured Event of Default,
            whether or not Mortgagor has notice of the same.

      14.   The Recitals set forth above constitute an integral part of this
            Fourth Modification and are incorporated herein by this reference
            with the same force and effect as if set forth herein as the
            agreements of the parties.

             [The remainder of this page has been intentionally left blank.]

                 * * SIGNATURES BEGIN ON THE FOLLOWING PAGE * *

                                       3
<PAGE>

      IN WITNESS WHEREOF, the parties hereto have signed, sealed and delivered
this Fourth Modification as of the date first written above.

"MORTGAGOR"

QUANTUM LEAP COMMUNICATIONS, INC.,
a Delaware corporation

By:   /s/ Stephen T. Gambill
   ---------------------------------------------
Name: Stephen T. Gambill
     -------------------------------------------
Its:    VP & CFO
        --------

"MORTGAGEE"

AMERICAN NATIONAL BANK
AND TRUST COMPANY OF CHICAGO

By:
   ---------------------------------------
Name:
     -------------------------------------
Its:
    --------------------------------------

                                       4
<PAGE>

STATE OF ILLINOIS )
                        ) SS
COUNTY OF COOK    )

      I, the undersigned, a Notary Public, in and for the County and State
aforesaid, DO HEREBY CERTIFY, that __________, personally known to me to be
_________________ the and _______________ ___, personally known to me to be
the ___________________ of QUANTUM LEAP COMMUNICATIONS, INC., a Delaware
corporation, appeared before me this day in person and severally acknowledged
that as such and __________________, he/she/they signed and delivered the
said instrument as ________________ and ________________________ of said
corporation pursuant to authority given by the Board of Directors of said
corporation as their/his/her free and voluntary act, for the uses and
purposes therein set forth.

      Given under my hand and official seal this _____ day of __________, 2000.

                                          _________________________
                                          Notary Public

                                          My Commission Expires: _____/_____/___

STATE OF ILLINOIS       )
                        ) SS
COUNTY OF ___________   )

      I, the undersigned, a Notary Public, in and for the County and State
aforesaid, DO HEREBY CERTIFY, that ________________________, as
__________________________ of AMERICAN NATIONAL BANK AND TRUST COMPANY OF
CHICAGO, a national banking association, appeared before me this day in person
and acknowledged that as such ____________________ that he/she signed and
delivered the said instrument on behalf of said national banking association
pursuant to authority given by such association as his/her free and voluntary
act, for the uses and purposes therein set forth.

      Given under my hand and official seal this _____ day of _______________,
2000.

                                          _________________________
                                          Notary Public

                                          My Commission Expires: _____/_____/___

                                       EXHIBIT "A"

                                Legal Description

Units No. 1, No. 2 , No. 3 and No. 4 in Gibraltar Lofts, 420 West Huron
condominium, as delineated on a survey of the following described real estate:

Lots 20, 21 and 22 in Block 7 in Higgins Law and Co.'s Addition to Chicago in
the Northeast 1/4 of the Northwest 1/4 of Section 9, Township 39 North, Range
14, East of the Third Principal Meridian, in Cook County, Illinois;

which survey is attached as Exhibit "A" to the Declaration of Condominium
recorded as document 24777965, together with its undivided percentage interest
in the common elements, in Cook County, Illinois.

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COMMONLY KNOWN AS:   Units 1, 2, 3 and 4 in Gibraltar Lofts - 420 West Huron
                              Condominium
                              420 West Huron Street
                              Chicago, Illinois 60610

PIN NUMBERS:      17-09-120-015-1001
                  17-09-120-015-1002
                  17-09-120-015-1003
                  17-09-120-015-1004

                                       6<PAGE>

                                                                Exhibit 10.3

                     FIRST AMENDMENT TO AMENDED AND RESTATED
               OWENS-ILLINOIS SUPPLEMENTAL RETIREMENT BENEFIT PLAN

      Pursuant to authority reserved to the Board of Directors of
Owens-Illinois, Inc. (the "COMPANY") and duly delegated to the undersigned
officer of the Company under the Amended and Restated Owens-Illinois
Supplemental Retirement Benefit Plan (the "PLAN"), the Plan is hereby amended as
follows:

      1. Article IV of the Plan is amended by redesignating Section 4.04 as
Section 4.05 and by adding a new Section 4.04 to read, in its entirety, as
follows:

            SECTION 4.04 - (a) Any provision of this Plan or of the Salary Plan
      to the contrary notwithstanding, the Board or the Executive Compensation
      Committee may, in its sole and unlimited discretion, upon such terms and
      conditions as the Board or the Executive Compensation Committee may
      determine:

                  (1) accelerate the payment date of any retirement benefit
            hereunder to any date preceding the payment date otherwise
            applicable to such benefit hereunder, without regard to whether or
            not the Eligible Employee with respect to whom such benefit is
            payable has retired or otherwise terminated employment;

                  (2) direct that such benefit (including the amount, if any,
            payable under (3) or (4), below) shall be paid as an immediate
            lump-sum payment in an amount equal to its then current value, as
            determined by (or in the manner prescribed by) the Executive
            Compensation Committee;

                  (3) direct that, to the extent such Eligible Employee would
            have been entitled to any additional and/or enhanced benefits under
            the Salary Plan and this Plan if he had retired or otherwise
            terminated employment on a date specified by the Executive
            Compensation Committee, such accelerated payment shall include all
            or any part of the then current value of such additional and/or
            enhanced benefits, as determined by (or in the manner prescribed by)
            the Executive Compensation Committee; and/or

                  (4) direct that, if such Eligible Employee would not have been
            so entitled to any such additional and/or enhanced benefits, such
            accelerated payment shall nevertheless include all or any part, as
            specified by the Executive Compensation Committee, of the then
            current value of such additional and/or enhanced benefits, as
            determined by (or in the manner prescribed by) the Executive
            Compensation Committee.
<PAGE>

            (b) To the extent any accelerated benefit payment is made to an
      Eligible Employee pursuant to Section 4.04(a), the Executive Compensation
      Committee shall determine the nature and amount of the corresponding
      offset or other adjustment to be made to any retirement, survivor, or
      death benefit subsequently payable hereunder to or with respect to such
      Eligible Employee.

            (c) Any amount otherwise payable to an Eligible Employee under
      Section 4.04(a) may, as and to the extent directed by the Executive
      Compensation Committee, be transferred directly to a bank, mutual fund, or
      other financial institution designated by the Executive Compensation
      Committee, for deposit or investment in the name and on behalf of such
      Eligible Employee in one or more available savings or investment media, as
      specified by the Executive Compensation Committee.

      2. This First Amendment shall be effective on or as of October 1, 2000. In
all other respects the Plan shall remain in full force and effect as amended and
restated on May 29, 1998, effective as of January 1, 1998.

      IN WITNESS WHEREOF, this First Amendment has been executed by a duly
authorized officer of the Company this 1st day of November, 2000.

                                 OWENS-ILLINOIS, INC.

                                 By  /s/ Thomas L. Young
                                     -------------------------------------------
                                       Thomas L. Young,
                                       Executive Vice President, Administration

Attest:

   /s/ James W. Baehren
------------------------------------------------------------
      James W. Baehren,
      Secretary

                                      -2-

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