THE CHASE MANHATTAN BANK

                                    GUARANTY

        Bohemia                , New York,          April 3, 2000
        -------                                     -------------
        Location                                        Date

     WHEREAS, PWR Systems, Inc. (hereinafter called the "Borrower"),  desires to
transact business with and to obtain credit or a continuation of credit or other
financial  accommodations  from THE CHASE  MANHATTAN  BANK,  a New York  banking
corporation (hereinafter called the "Bank"); and

     WHEREAS,  the Bank is  unwilling  to extend or continue  credit to or other
financial  accommodations  to the  Borrower,  unless it receives  the  following
guaranty of the undersigned;

     NOW,  THEREFORE,  in  consideration  of the  premises and of other good and
valuable consideration and in order to induce the Bank from time to time, in its
discretion,  to extend or continue credit or other financial  accommodations  to
the Borrower, the undersigned hereby guarantees, absolutely and unconditionally,
to the  Bank the  payment  of all  liabilities  of the  Borrower  to the Bank of
whatever  nature,  whether now existing or hereafter  incurred,  whether created
directly or acquired by the Bank by assignment or otherwise,  whether matured or
unmatured  and whether  absolute  or  contingent  (all of which are  hereinafter
collectively referred to as the "Liabilities of the Borrower").

     In order to further secure the payment of the  Liabilities of the Borrower,
the undersigned does hereby give the Bank a continuing lien and right of set-off
for the  amount of the  Liabilities  of the  Borrower  upon any and all  monies,
securities  and any and all other property of the  undersigned  and the proceeds
thereof,  now or hereafter actually or constructively  held or received by or in
transit in any manner to or from the Bank,  Chase  Securities Inc., or any other
affiliate  of the Bank from or for the  undersigned,  whether  for  safekeeping,
custody,  pledge,  transmission,  collection  or  otherwise  or coming  into the
possession of the Bank,  Chase  Securities  Inc., or any other  affiliate of the
Bank in any way,  or placed in any safe  deposit  box leased by the Bank,  Chase
Securities Inc., or any other affiliate of the Bank to the undersigned. The Bank
is also  given a  continuing  lien and right of  set-off  for the amount of said
Liabilities of the Borrower upon any and all deposits  (general and special) and
credits of, or for the benefit of the  undersigned  with, and any and all claims
of the  undersigned  against,  the Bank,  Chase  Securities  Inc.,  or any other
affiliate of the Bank at any time existing. The Bank is hereby authorized at any
time or times,  without prior notice, to apply such deposits or credits,  or any
part thereof, to such Liabilities of the Borrower and, although said Liabilities
of the Borrower  may be  contingent  or  unmatured,  and whether the  collateral
security therefor is deemed adequate or not. The undersigned authorizes the Bank
to  deliver a copy of this  guaranty  to others as written  notification  of the
undersigned's transfer of a security interest in the collateral described herein
to the Bank.

<PAGE>

     The  undersigned  agrees  that,  with or  without  notice  or  demand,  the
undersigned  shall  reimburse  the Bank for all the Bank's  expenses  (including
reasonable fees of counsel for the Bank who may be employees  thereof)  incurred
in  connection  with any of the  Liabilities  of the Borrower or the  collection
thereof.

     This  guaranty is a continuing  guaranty and shall remain in full force and
effect  irrespective  of any  interruptions  in the  business  relations  of the
Borrower with the Bank; provided,  however,  that the undersigned may, by notice
in writing,  delivered  personally or received by certified mail, return receipt
requested, addressed to the Bank's office at 4 Chase Metrotech Center, Brooklyn,
NY 11245,  Commercial Loan Operations,  Attention:  Daniel Papa,  terminate this
guaranty,  but any such  termination  shall have no effect  with  respect to the
Liabilities of the Borrower (including  contingent  liabilities) existing on the
date on which such notice is so  delivered or received or which on such date the
Bank is  obligated  (including  on a  conditional  basis) to  provide or acquire
thereafter,  or  with  respect  to any  interest,  fees,  indemnities,  charges,
expenses or costs  payable  thereon or  attributable  thereto even if arising or
incurred  after  such  date,  and  this  guaranty  and  the  obligations  of the
undersigned  hereunder with respect to the foregoing Liabilities of the Borrower
shall continue  notwithstanding  any such termination until all such amounts are
fully and finally paid.

     All monies available to the Bank for application in payment or reduction of
the Liabilities of the Borrower may be applied by the Bank in such manner and in
such  amounts  and at such  time or  times as it may see fit to the  payment  or
reduction of such of the Liabilities of the Borrower as the Bank may elect.

     The  undersigned  hereby waives:  (a) notice of acceptance of this guaranty
and of extensions of credit or other financial accommodations by the Bank to the
Borrower;  (b)  presentment  and demand for payment of any of the Liabilities of
the Borrower;  (c) protest and notice of dishonor or default to the  undersigned
or to any other party with respect to any of the  Liabilities  of the  Borrower;
(d) all other notices to which the  undersigned  may otherwise be entitled;  and
(e) any demand for payment hereunder.

     All  liabilities  of the  undersigned  to the Bank  hereunder or otherwise,
whether or not then due or  absolute  or  contingent,  shall  without  notice or
demand become due and payable  immediately upon the occurrence of any default or
event of  default  with  respect  to any  Liabilities  of the  Borrower  (or the
occurrence of any other event which results in  acceleration  of the maturity of
any thereof) or the occurrence of any default  hereunder.  This is a guaranty of
payment and not of collection and the undersigned further waives unconditionally
and  irrevocably  any right to require  that any action be brought  against  the
Borrower or any other person or to require that resort be had to any security or
any other  property or asset or to any balance of any deposit  account or credit
on the books of the Bank in favor of the  Borrower or any other  person prior to
any payment under this guaranty being made or enforced.

<PAGE>

     The undersigned hereby consents that from time to time, before or after any
default by the  Borrower or any notice of  termination  hereof,  with or without
further notice to or assent from the undersigned,  any security at any time held
by or available to the Bank for any obligation of the Borrower,  or any security
at any time held by or  available  to the Bank for any  obligation  of any other
person  secondarily  or  otherwise  liable  for  any of the  Liabilities  of the
Borrower,  may be exchanged,  surrendered  or released and any obligation of the
Borrower,  or of any  such  other  person,  may be  changed,  altered,  renewed,
extended, continued, surrendered, compromised, waived, discharged or released in
whole or in part (including without limitation any such event resulting from any
insolvency, bankruptcy, reorganization or other similar proceeding affecting the
Borrower or its assets) or any default with respect thereto waived, and the Bank
may fail to set off and may  release,  in whole or in part,  any  balance of any
deposit  account or credit on the Bank's books in favor of the  Borrower,  or of
any such other person, and may extend further credit in any manner whatsoever to
the Borrower,  and generally deal or take action or no action with regard to the
Borrower or any such  security or other  person as the Bank may see fit; and the
undersigned  shall remain  bound under this  guaranty  notwithstanding  any such
exchange,   surrender,   release,  change,   alteration,   renewal,   extension,
continuance,  compromise,  waiver,  discharge,  inaction,  extension  of further
credit or other dealing.

     The obligations of the undersigned are absolute and  unconditional  and are
valid  irrespective  of any amendment,  modification,  waiver,  consent or other
change, discharge or release (including by operation of law, regulation or legal
proceedings) with respect to, or any lack of validity or enforceability  of, any
Liabilities of the Borrower,  or with respect to any other  guaranty  thereof or
other credit support thereto or any collateral securing any of the foregoing, or
any other agreement or circumstance  which might otherwise  constitute a defense
to the obligations hereunder to any of the Liabilities of the Borrower or to the
obligations of others related hereto or thereto and the undersigned  irrevocably
waives  the  right  to  assert  defenses,  set-offs  and  counterclaims  in  any
litigation  relating to this guaranty and the Liabilities of the Borrower.  This
guaranty sets forth the entire understanding of the parties, and the undersigned
acknowledges   that  no  oral  or  other   agreements,   conditions,   promises,
understandings, representations or warranties exist in regard to the obligations
hereunder, except those specifically set forth herein.

     The undersigned irrevocably waives and shall not seek to enforce or collect
upon any rights which it now has or may acquire against the Borrower,  either by
way of  subrogation,  indemnity,  reimbursement  or  contribution,  or any other
similar  right,  for any amount paid under this  guaranty or by way of any other
obligations whatsoever of the Borrower to the undersigned. In the event either a
petition  is filed  under the  Bankruptcy  Code in regard to the  Borrower or an
action or  proceeding  is  commenced  for the  benefit of the  creditors  of the
Borrower,  this  agreement  shall at all times  thereafter  remain  effective in
regard to any payments or other transfers of assets to the Bank received from or
on behalf of the Borrower  prior to notice of  termination  of this guaranty and
which are or may be held voidable or otherwise subject to recission or return on
the grounds of preference,  fraudulent  conveyance or otherwise,  whether or not
the Liabilities of the Borrower have been paid in full.

     Each reference herein to the Bank shall be deemed to include its successors
and assigns,  in whose favor the  provisions of this guaranty  shall also inure.
Each reference  herein to the undersigned  shall be deemed to include the heirs,
executors, administrators, legal representatives,  successors and assigns of the
undersigned, all of whom shall be bound by the provisions of this guaranty.

     The term  "undersigned"  as used herein shall, if this instrument is signed
by more  than one  party,  mean  the  "undersigned  and  each of them"  and each
undertaking  herein  contained  shall be their  joint and  several  undertaking,
provided,  however,  that in the  next  succeeding  paragraph  hereof  the  term
"undersigned"  shall mean the  "undersigned or any of them". If any party hereto
shall  be a  partnership,  the  agreements  and  obligations  on the part of the
undersigned  herein  contained shall remain in force and applicable  against the
partnership  and  all  of  its  partners  (notwithstanding  any  changes  in the
individuals  composing the  partnership  or any release of one or more partners)
and the term "undersigned"  shall include any altered or successive  partnership
but,  the  predecessor  partnerships  and their  partners  shall not  thereby be
released from any obligation or liability.

<PAGE>

     No delay on the part of the Bank in  exercising  any  rights  hereunder  or
failure to exercise the same shall operate as a waiver of such rights; no notice
to or demand on the undersigned shall be deemed to be a waiver of the obligation
of the  undersigned  or of the right of the Bank to take further  action without
notice or demand as provided herein;  nor in any event shall any modification or
waiver of the provisions of this guaranty be effective  unless in writing signed
by an  authorized  officer of the Bank;  nor shall any such waiver be applicable
except in the specific instance for which given.

     This guaranty is, and shall be deemed to be, a contract  entered into under
and  pursuant to the laws of the State of New York and shall be in all  respects
governed,  construed,  applied and enforced in accordance  with the laws of said
State; and no defense given or allowed by the laws of any other State or Country
shall be  interposed  in any action  hereon unless such defense is also given or
allowed by the laws of the State of New York.

     The undersigned  hereby  unconditionally  WAIVES ANY RIGHT TO JURY TRIAL in
connection  with actions by or against the Bank arising out of or in  connection
with the Liabilities of the Borrower and this guaranty.




If partnership, Individual or Partnership          Corporation
name of
partnership
and signature
of general
partner(s)
must appear.)
                                                          Vizacom Inc.
                ----------------------                    ------------

                Name of Guarantor                  Name of Guarantor
                           (Type or Print)                    (Type or Print)

                                                        /s/ Alan W. Schoenbart
                 ---------------------                  ----------------------
                                                   By:       Alan W. Schoenbart
                 ---------------------                       ------------------

                 ---------------------             -------------------------

                Address

                                                        Chief Financial Officer
                 ---------------------                  ------------------------
                                                                 Title



(AFFIX CORPORATE SEAL HERE)