Exhibit 24

                                POWER OF ATTORNEY

        Know all by these presents, that the undersigned hereby constitutes and
appoints each of Bryan E. Bloom and Edward T. Dartley singly, his true and
lawful attorney-in-fact to:

        1. execute for and on behalf of the undersigned Schedules 13D, 13D/A,
13G and 13G/A, and Forms 3, 4 and 5 in accordance with Sections 13 and 15(a) of
the Securities Exchanges Act of 1934 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 the execution of any such
Schedules 13D, 13D/A, 13G or 13G/A, and Forms 3, 4 or 5 and the timely filing of
such Forms with the United States Securities and Exchange Commission and any
other 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, including
without limitation the execution and filing of a Form 4 with respect to a
transaction which may be reported on a Form 5, 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 his/her discretion.

The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform all and every act and thing whatsoever requisite,
necessary and proper to be done in the exercise of any of the rights and powers
herein granted, as fully and to all intents and purposes as he might or could do
in person, with full power of substitution and resubstitution, hereby ratifying
and confirming all that such attorney-in-fact, or his/her 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 Securities Exchange Act of 1934.

The undersigned also has, effective October 23, 2006, revoked the power of
attorney granted to William C. Connors, originally granted by a power of
attorney dated March 8, 2005.

        IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 13th day of February, 2007.


                                        /s/ William R. Huff
                                        ----------------------------------------
                                        Print Name: William R. Huff