POWER OF ATTORNEY

         Know all by these presents, that the undersigned hereby constitutes and
appoints each of Harry Brandler and Daniel Roitman, signing singly, the
undersigned's true and lawful attorney-in-fact to:

         (1) execute for and on behalf of the undersigned, in the undersigned's
capacity as managing member and/or officer of each of Greenlight Capital, Inc.,
Greenlight Capital, L.L.C., Greenlight Masters, LLC, Greenlight Masters GP, LLC
and DME Advisors, LP (each a "COMPANY" and collectively, the "COMPANIES") and in
his own capacity Forms 3, 4, and 5 and Schedules 13D and 13G in accordance with
Sections 13(d) and 16(a) of the Securities Exchange Act of 1934, as amended (the
"ACT"), and the rules thereunder;

         (2) do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete and execute any such
Form 3, 4, or 5, or Schedule 13D or 13G, complete and execute any amendment or
amendments thereto, and timely file such form with the U.S. Securities and
Exchange Commission and any stock exchange or similar authority; and

         (3) take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of benefit to,
in the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact may approve in such
attorney-in-fact's discretion.

         The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary, or proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of attorney and the
rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming any of the undersigned's responsibilities to
comply with Sections 13 and 16 of the Act.

         This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 and Schedules 13D
and 13G with respect to the undersigned's holdings of and transactions in
securities beneficially owned by the Companies or the undersigned in accordance
with Rule 13d-1 under the Act, unless earlier revoked by the undersigned in a
signed writing delivered to the foregoing attorneys-in-fact.

         IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of this 7th day of July, 2005.

                                     /s/ David Einhorn
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                                     Signature

                                     David Einhorn
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