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 12th day of May,
2003.
/s/ Edward K. Christian
Edward K.
Christian