Exhibit 31.1

        CERTIFICATION PURSUANT TO RULE 13a-14 OR 15d-14 OF THE SECURITIES
         EXCHANGE ACT OF 1934, AS ADOPTED PURSUANT TO SECTION 302 OF THE
                           SARBANES-OXLEY ACT OF 2002

I, David Shamy, Principal Executive Officer and Principal Financial Officer of
Intraop Medical Corporation (formerly Digitalpreviews.com, Inc.) (the
"Registrant"), certify that:

(1) I have reviewed this quarterly  report on  Form10-QSB/A  of Intraop  Medical
Corporation (formerly Digitalpreviews.com, Inc.);

(2) Based on my  knowledge,  this  quarterly  report does not contain any untrue
statement of a material fact or omit to state a material fact  necessary to make
the statements made, in light of the  circumstances  under which such statements
were made, not  misleading  with respect to the period covered by this quarterly
report;

(3)  Based on my  knowledge,  the  financial  statements,  and  other  financial
information  included in this quarterly  report,  fairly present in all material
respects the financial  condition,  results of operations  and cash flows of the
Registrant as of, and for, the periods presented in this quarterly report;

(4)  The  Registrant's  other  certifying  officers  and I are  responsible  for
establishing and maintaining  disclosure  controls and procedures (as defined in
Exchange Act Rules 13a-14 and 15d-14) for the Registrant and have:

          a) designed such disclosure controls and procedures to ensure that
     material information relating to the Registrant, including its consolidated
     subsidiaries, is made known to us by others within those entities,
     particularly during the period in which this quarterly report is being
     prepared;

          b) evaluated the effectiveness of the Registrant's disclosure controls
     and procedures as of a date within 90 days prior to the filing date of this
     quarterly report (the "Evaluation Date"); and

          c) presented in this quarterly report our conclusions about the
     effectiveness of the disclosure controls and procedures based on our
     evaluation as of the Evaluation Date;

(5) The Registrant's  other certifying  officers and I have disclosed,  based on
our most recent evaluation, to the Registrant's auditors and the audit committee
of  Registrant's  board of  directors  (or  persons  performing  the  equivalent
functions):

          a) all significant deficiencies in the design or operation of internal
     controls which could adversely affect the Registrant's ability to record,
     process, summarize and report financial data and have identified for the
     Registrant's auditors any material weaknesses in internal controls; and

          b) any fraud, whether or not material, that involves management or
     other employees who have a significant role in the Registrant's internal
     controls; and

(6) The  Registrant's  other  certifying  officers and I have  indicated in this
quarterly  report  whether or not there  were  significant  changes in  internal
controls or in other facts that could  significantly  affect  internal  controls
subsequent to the date of our most recent  evaluation,  including any corrective
actions with regard to significant deficiencies and material weaknesses.

                                                 /s/   David Shamy
                                                 ---------------------------
                                                 David Shamy
                                                 Principal Executive Officer
                                                 Principal Financial Officer

                                                 Date:  July 14, 2004

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