EXHIBIT 6
         to SCHEDULE 13D



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENT, that I, GEORGE SOROS, hereby make,
         constitute and appoint each of Armando T. Belly, Jodye Anzalotta,
         Maryann Canfield, Sean Cullinan, Richard D. Holahan, Jr. and Robert
         Soros acting individually, as my agent and attorney-in-fact for the
         purpose of executing in my name, (a) in my personal capacity or (b) in
         my capacity as Chairman of, member of or in other capacities with Soros
         Fund Management LLC ("SFM LLC") and each of its affiliates or entities
         advised by me or SFM LLC, all documents, certificates, instruments,
         statements, filings and agreements ("documents") to be filed with or
         delivered to any foreign or domestic governmental or regulatory body or
         required or requested by any other person or entity pursuant to any
         legal or regulatory requirement relating to the acquisition, ownership,
         management or disposition of securities, futures contracts, or other
         investments, and any other documents relating or ancillary thereto,
         including but not limited to, all documents relating to filings with
         the Commodities Futures Trading Commission and National Futures
         Association, the United States Securities and Exchange Commission (the
         "SEC") pursuant to the Commodities Exchange Act and the Securities Act
         of 1933 or the Securities Exchange Act of 1934 (the "Act") and the
         rules and regulations promulgated thereunder, including all documents
         relating to the beneficial ownership of securities required to be filed
         with the SEC pursuant to Section 13(d) or Section 16(a) of the Act and
         information statements on Form 13F required to be filed with the SEC
         pursuant to Section 13(f) of the Act.

         All past acts of the attorney-in-fact in furtherance of the foregoing
         are hereby ratified and confirmed.

         Execution of this power of attorney revokes that certain Power of
         Attorney dated as of the 27th day of January 2000 with respect to the
         same matters addressed above.

         This power of attorney shall be valid from the date hereof until
         revoked by me.

         IN WITNESS WHEREOF, I have executed this instrument as of the 15th day
         of January, 2002.


                                        /s/ George Soros
                                        ---------------------------------------
                                        GEORGE SOROS