POWER OF ATTORNEY
    KNOW ALL PERSONS BY THESE PRESENTS, that the
undersigned constitutes and appoints Samuel D. Bush, Marcia Lobaito and
Paul R. Rentenbach, and each of them, the undersigned's true and lawful
attorneys-in-fact and agents, with full power of substitution, and
resubstitution for the undersigned and in the undersigned's name, place and
stead, in any and all capacities, to:
   (1)   execute for and on behalf
of the undersigned Forms 3, 4 and 5 and all other forms that may be
required to be filed by the undersigned from time to time under Section
16(a) of the Securities Exchange Act of 1934 and the rules promulgated
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
such forms and timely file such forms with the United States 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
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 each and
every act and thing 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 in person, with
full power of substitution or revocation, hereby ratifying and confirming
all that such attorney-in-fact and agents, or any of them, or their or his
or her substitute or substitutes, may lawfully do or cause to be done by
virtue hereof.  The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934.
    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 or any other forms under Section 16(a) of the Securities
Exchange Act of 1934, 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 6th day of July, 2004.

/s/ Clarke R. Brown, Jr.

Clarke R. Brown, Jr.