SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                ----------------

                                  SCHEDULE 13G
                                ----------------

             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                       Integrated Electrical Systems, Inc.
                                (NAME OF ISSUER)

                          Common Stock, $0.01 par value
                         (TITLE OF CLASS OF SECURITIES)

                                    45811E103
                                 (CUSIP NUMBER)

                                December 31, 2004
             (Date of Event which requires Filing of this Statement)

                          Check the appropriate box to
                         designate the rule pursuant to
                          which this Schedule is filed:

                                [ ] Rule 13d-1(b)
                                [x] Rule 13d-1(c)
                                [ ] Rule 13d-1(d)






                              (Page 1 of 16 Pages)
------------------

*    The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.

     The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).





CUSIP No. 45811E103                       13G                 PAGE 2 of 16 PAGES

--------------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON
          Ardsley Partners Fund II, L.P.
--------------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                    (a)  [ ]
                                                                    (b)  [x]
--------------------------------------------------------------------------------
     (3)  SEC USE ONLY

--------------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
          Delaware
--------------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    660,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    660,000
--------------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
          660,000
--------------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
--------------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          1.7%
--------------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON **
          PN
--------------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 45811E103                      13G                  PAGE 3 of 16 PAGES

--------------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON
          Ardsley Partners Institutional Fund, L.P.
--------------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                    (a)  [ ]
                                                                    (b)  [x]
--------------------------------------------------------------------------------
     (3)  SEC USE ONLY

--------------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
          Delaware
--------------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         -----------------------------------------------------------------
BENEFICIALLY   (6)  SHARED VOTING POWER
                    325,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    325,000

--------------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
          325,000
--------------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
--------------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          0.8%
--------------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON ** 
          PN
--------------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 45811E103                      13G                  PAGE 4 of 16 PAGES

--------------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON
          Ardsley Offshore Fund Ltd.
--------------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                    (a)  [ ]
                                                                    (b)  [x]
--------------------------------------------------------------------------------
     (3)  SEC USE ONLY

--------------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
          British Virgin Islands
--------------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    965,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    965,000
--------------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
          965,000
--------------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
--------------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          2.5%
--------------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON **
          CO
--------------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 45811E103                      13G                  PAGE 5 of 16 PAGES

--------------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON
          Ardsley Advisory Partners
--------------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                    (a)  [ ]
                                                                    (b)  [x]
--------------------------------------------------------------------------------
     (3)  SEC USE ONLY

--------------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
          Connecticut
--------------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    2,000,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    2,000,000
--------------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
          2,000,000
--------------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
--------------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          5.2%
--------------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON **
          PN; IA
--------------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 45811E103                      13G                  PAGE 6 of 16 PAGES

--------------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON
          Ardsley Partners I
--------------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                    (a)  [ ]
                                                                    (b)  [x]
--------------------------------------------------------------------------------
     (3)  SEC USE ONLY

--------------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
          Connecticut
--------------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    985,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    985,000
--------------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
          985,000
--------------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
--------------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          2.6%
--------------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON **
          PN
--------------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 45811E103                      13G                  PAGE 7 of 16 PAGES

--------------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON
          Philip J. Hempleman
--------------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                    (a)  [ ]
                                                                    (b)  [x]
--------------------------------------------------------------------------------
     (3)  SEC USE ONLY

--------------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
          United States
--------------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    2,000,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    2,000,000
--------------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
          2,000,000
--------------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
--------------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          5.2%
--------------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON **
          IN
--------------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 45811E103                       13G                 PAGE 8 of 16 PAGES

ITEM 1(a).  NAME OF ISSUER:

             The name of the issuer is Integrated Electrical Systems, Inc. (the
"Company").

ITEM 1(b).  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
             1800 West Loop South, Suite 500, Houston, Texas 77027

ITEM 2(a).  NAME OF PERSON FILING:

       This statement is filed by:

       (i)   Ardsley Partners Fund II, L.P., a Delaware limited partnership
             ("AP II"), with respect to the shares of Common Stock (defined
             in Item 2(d) below) directly owned by it;
       (ii)  Ardsley Partners Institutional Fund, L.P., a Delaware limited
             partnership ("Ardsley Institutional"), with respect to the
             shares of Common Stock directly owned by it;
       (iii) Ardsley Offshore Fund Ltd., a British Virgin Islands Corporation
             ("Ardsley Offshore"), with respect to the shares of Common Stock
             directly owned by it;
       (iv)  Ardsley Advisory Partners, a Connecticut general partnership
             ("Ardsley") which serves as Investment Manager of Ardsley Offshore
             and the Investment Adviser of AP II, Ardsley Institutional and 
             certain managed accounts, with respect to the shares of Common
             Stock directly owned by Ardsley Offshore, AP II, Ardsley
             Institutional and the managed accounts;
        (v)  Ardsley Partners I, a Connecticut general partnership
             ("Ardsley Partners") which serves as General Partner of AP II
             and Ardsley Institutional; and
       (vi)  Philip J. Hempleman, the Managing Partner of Ardsley and
             Ardsley Partners, with respect to the shares of Common Stock
             owned by AP II, Ardsley Institutional, Ardsley Offshore and
             the managed accounts.

             The foregoing persons are hereinafter sometimes collectively
referred to as the "Reporting Persons". Any disclosures herein with respect to
persons other than the Reporting Persons are made on information and belief
after making inquiry to the appropriate party.

ITEM 2(b).  ADDRESS OF PRINCIPAL OFFICE OR, IF NONE, RESIDENCE:

       The address of the business office of each of the Reporting Persons,
with the exception of Ardsley Offshore, is 262 Harbor Drive, Stamford,
Connecticut 06902.

       The address of the registered office of Ardsley Offshore is Romasco
Place, Wickhams Cay 1, Roadtown Tortola, British Virgin Islands.

ITEM 2(c).  CITIZENSHIP:

       AP II and Ardsley Institutional are Delaware limited partnerships.  
Ardsley Offshore is a British Virgin Islands Corporation. Ardsley and Ardsley
Partners are Connecticut general partnerships. Mr. Hempleman is a United States
Citizen.

ITEM 2(d).  TITLE OF CLASS OF SECURITIES:  Common Stock, $0.01 par value
("Common Stock")





CUSIP No. 45811E103                       13G                 PAGE 9 of 16 PAGES

ITEM 2(e).  CUSIP NUMBER:  45811E103

ITEM 3.   IF THIS STATEMENT IS FILED PURSUANT TO RULES 13d-1(b), OR 13d-2(b),
CHECK WHETHER THE PERSON FILING IS A:

          (a)  [ ] Broker or dealer registered under Section 15 of the Act

          (b)  [ ] Bank as defined in Section 3(a)(6) of the Act

          (c)  [ ] Insurance Company as defined in Section 3(a)(19) of the
                   Act

          (d)  [ ] Investment Company registered under Section 8 of the
                   Investment Company Act

          (e)  [ ] Investment Adviser registered under Section 203 of the
                   Investment Advisers Act of 1940

          (f)  [ ] Employee Benefit Plan, Pension Fund which is subject to
                   the provisions of the Employee Retirement Income Security
                   Act of 1974 or Endowment Fund; see Rule 13d-1(b)(1)(ii)(F)

          (g)  [ ] Parent Holding Company, in accordance with
                   Rule 13d-1(b)(ii)(G); see item 7

          (h)  [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(H)

If this statement is filed pursuant to Rule 13d-1(c), check the box. [X]





CUSIP No. 45811E103                      13G                 PAGE 10 of 16 PAGES

ITEM 4.   OWNERSHIP.

       A.    Ardsley Partners Fund II, L.P.
             (a) Amount beneficially owned: 660,000
             (b) Percent of class: 1.7%. The percentages used herein and in
the rest of Item 4 are calculated based upon the 38,439,984 shares of Common
Stock issued and outstanding at December 29, 2004 as reflected in the Company's
Schedule 14A filed January 19, 2005.
             (c) (i) Sole Power to vote or direct the vote: -0- 
                (ii) Shared power to vote or direct the vote: 660,000
               (iii) Sole power to dispose or direct the disposition: -0-
                (iv) Shared power to dispose or direct the disposition: 660,000

       B.    Ardsley Partners Institutional Fund, L.P.
             (a) Amount beneficially owned: 325,000
             (b) Percent of class: 0.8%
             (c) (i) Sole Power to vote or direct the vote: -0-
                (ii) Shared power to vote or direct the vote: 325,000
               (iii) Sole power to dispose or direct the disposition: -0-
                (iv) Shared power to dispose or direct the disposition: 325,000

       C.    Ardsley Offshore Fund Ltd.
             (a) Amount beneficially owned: 965,000
             (b) Percent of class: 2.5%
             (c) (i) Sole Power to vote or direct the vote: -0-
                (ii) Shared power to vote or direct the vote: 965,000
               (iii) Sole power to dispose or direct the disposition: -0-
                (iv) Shared power to dispose or direct the disposition: 965,000

       D.    Ardsley Advisory Partners
             (a) Amount beneficially owned: 2,000,000
             (b) Percent of class: 5.2%
             (c) (i) Sole Power to vote or direct the vote: -0-
                (ii) Shared power to vote or direct the vote: 2,000,000
               (iii) Sole power to dispose or direct the disposition: -0-
                (iv) Shared power to dispose or direct the disposition:
                     2,000,000

       E.    Ardsley Partners I
             (a) Amount beneficially owned: 985,000
             (b) Percent of class: 2.6%
             (c) (i) Sole Power to vote or direct the vote: -0-
                (ii) Shared power to vote or direct the vote: 985,000
               (iii) Sole power to dispose or direct the disposition: -0-
                (iv) Shared power to dispose or direct the disposition: 985,000

       F.    Philip J. Hempleman
             (a) Amount beneficially owned: 2,000,000
             (b) Percent of class: 5.2% 
             (c) (i) Sole Power to vote or direct the vote: 2,000,000
                (ii) Shared power to vote or direct the vote: -0-
               (iii) Sole power to dispose or direct the disposition: 2,000,000
                (iv) Shared power to dispose or direct the disposition: -0-





CUSIP No. 45811E103                      13G                 PAGE 11 of 16 PAGES

ITEM 5.   OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.
          Not applicable.

ITEM 6.   OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

      Ardsley, the Investment Manager of Ardsley Offshore and the Investment
Adviser of certain managed accounts, has the power to vote and direct the
disposition of the proceeds from the sale of the shares of Common Stock owned by
Ardsley Offshore and the managed accounts, and accordingly may be deemed the
direct "beneficial owner" of such shares of Common Stock.

      Ardsley, the Investment Adviser of AP II and Ardsley Institutional
shares the power to vote and direct the disposition of the proceeds from the
sale of the shares of Common Stock owned by AP II and Ardsley Institutional, and
accordingly may be deemed the direct "beneficial owner" of such shares of Common
Stock.

      Ardsley Partners, the General Partner of AP II and Ardsley
Institutional shares the power to vote and direct the disposition of the shares
of Common Stock owned by AP II and Ardsley Institutional, and accordingly may be
deemed the direct "beneficial owner" of such shares of Common Stock.

      Mr. Hempleman is the Managing Partner of Ardsley and Ardsley Partners
and in that capacity directs their operations and therefore may be deemed to be
the indirect "beneficial owner" of the shares of Common Stock owned by Ardsley
Offshore, AP II, Ardsley Institutional and the managed accounts.

ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
        THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.
        Not applicable.

ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.
        Not applicable.

ITEM 9. NOTICE OF DISSOLUTION OF GROUP.
        Not applicable.





CUSIP No. 45811E103                      13G                 PAGE 12 of 16 PAGES

ITEM 10.  CERTIFICATION.

     Each of the Reporting Persons hereby makes the following certification:

          By signing below I certify, to the best of my knowledge and belief,
the securities referred to above were acquired in the ordinary course of
business, were not acquired for the purpose of and do not have the effect of
changing or influencing the control of the issuer of such securities and were
not acquired in connection with or as a participant in any transaction having
such purposes or effect.





CUSIP No. 45811E103                      13G                 PAGE 13 of 16 PAGES


                                   SIGNATURES

          After reasonable inquiry and to the best of their knowledge and
belief, the undersigned certify that the information set forth in this statement
is true, complete and correct.


DATED:  February 11, 2005


                                  ARDSLEY PARTNERS FUND II, L.P.
                                  BY:  ARDSLEY PARTNERS I,
                                       GENERAL PARTNER


                                  BY: /s/ Steve Napoli
                                      --------------------------------------
                                      Steve Napoli
                                      General Partner


                                  ARDSLEY PARTNERS INSTITUTIONAL FUND, L.P.
                                  BY:  ARDSLEY PARTNERS I,
                                       GENERAL PARTNER


                                  BY: /s/ Steve Napoli
                                      --------------------------------------
                                      Steve Napoli
                                      General Partner


                                  ARDSLEY OFFSHORE FUND LTD.


                                  BY: /s/ Neil Glass
                                      --------------------------------------
                                      Neil Glass
                                      Vice-President and Administrative Manager


                                  ARDSLEY ADVISORY PARTNERS


                                  BY: /s/ Steve Napoli
                                      --------------------------------------
                                      Steve Napoli
                                      General Partner





CUSIP No. 45811E103                      13G                 PAGE 14 of 16 PAGES


                                  ARDSLEY PARTNERS I
                                  BY:  STEVE NAPOLI
                                       GENERAL PARTNER


                                  BY: /s/ Steve Napoli
                                      --------------------------------------
                                      Steve Napoli
                                      General Partner


                                  PHILIP J. HEMPLEMAN, Individually


                                  BY: /s/ Steve Napoli 
                                      --------------------------------------
                                       Steve Napoli
                                       As attorney in fact for
                                       Philip J. Hempleman





CUSIP No. 45811E103                      13G                 PAGE 15 of 16 PAGES


               JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)(1)

              The undersigned acknowledge and agree that the foregoing statement
on Schedule 13G is filed on behalf of each of the undersigned and that all
subsequent amendments to this statement on Schedule 13G shall be filed on behalf
of each of the undersigned without the necessity of filing additional joint
filing statements. The undersigned acknowledge that each shall be responsible
for the timely filing of such amendments, and for the completeness and accuracy
of the information concerning him, her or it contained herein, but shall not be
responsible for the completeness and accuracy of the information concerning the
other entities or persons, except to the extent that he, she or it knows or has
reason to believe that such information is inaccurate.

Dated:  February 11, 2005


                                  ARDSLEY PARTNERS FUND II, L.P.
                                  BY:  ARDSLEY PARTNERS I,
                                       GENERAL PARTNER


                                  BY: /s/ Steve Napoli
                                      -------------------------------------
                                      Steve Napoli
                                      General Partner


                                  ARDSLEY PARTNERS INSTITUTIONAL FUND, L.P.
                                  BY:  ARDSLEY PARTNERS I,
                                       GENERAL PARTNER


                                  BY: /s/ Steve Napoli
                                      -------------------------------------
                                      Steve Napoli
                                      General Partner


                                  ARDSLEY OFFSHORE FUND LTD.


                                  BY: /s/ Neil Glass
                                      -------------------------------------
                                      Neil Glass
                                      Vice-President and Administrative Manager


                                  ARDSLEY ADVISORY PARTNERS


                                  BY: /s/ Steve Napoli
                                      -------------------------------------
                                      Steve Napoli
                                      General Partner





CUSIP No. 45811E103                      13G                 PAGE 16 of 16 PAGES


                                  ARDSLEY PARTNERS I
                                  BY:  STEVE NAPOLI
                                       GENERAL PARTNER


                                  BY: /s/ Steve Napoli
                                      -------------------------------------
                                      Steve Napoli
                                      General Partner


                                  PHILIP J. HEMPLEMAN, Individually


                                  BY: /s/ Steve Napoli 
                                      -------------------------------------
                                      Steve Napoli
                                      As attorney in fact for
                                      Philip J. Hempleman