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                                    EXHIBIT F

                                POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS,  that I, STANLEY F. DRUCKENMILLER,  hereby make,
constitute  and  appoint  each of MICHAEL C. NEUS and  RICHARD D.  HOLAHAN,  JR.
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 Lead
Portfolio  Manager  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  or  other
investments,  and any other documents relating or ancillary  thereto,  including
but not limited to, all  documents  relating to filings  with the United  States
Securities and Exchange Commission (the "SEC") pursuant to the Securities Act of
1933 or the  Securities  Exchange  Act of 1934  (the  "Act")  and the  rules and
regulations promulgated thereunder, including: (1) 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 including, without limitation: (a) any
acquisition  statements  on  Schedule  13D or  Schedule  13G and any  amendments
thereto, (b) any joint filing agreements pursuant to Rule 13d-1(k),  and (c) any
initial  statements  of, or  statements of changes in,  beneficial  ownership of
securities  on Form 3, Form 4 or Form 5 and (2) any  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.

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 27th day of
January, 2000.




                                            /s/ Stanley F. Druckenmiller
                                            ----------------------------
                                            STANLEY F. DRUCKENMILLER