Microsoft Word 11.0.6359; POWER OF ATTORNEY

Know all men by these presents that the undersigned hereby constitutes and
appoints each of Elizabeth B. Moore, Richard A. Cheap, and Nancy T. Hall,
signing singly, his true and lawful attorney-in-fact to:

(1) execute for an on behalf of the undersigned Forms 3, 4 and 5 in accordance
with Section 16(a) of the Securities Exchange Act of 1934 and the rules
thereunder or any other form, statement, certification or representation
required under the federal securities laws including Form 144 (hereinafter
collectively referred to as "Forms");

(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 Forms and
the filing of such Forms with the United States Securities and Exchange
Commission; 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 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 to all intents and purposes as such attorney-in-fact
might or could do if personally present, with full power of substitution or
revocation, 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. This
Power of Attorney shall remain in effect until revoked or until such time as the
undersigned is no longer subject to Section 16 of the Securities Exchange Act of
1934 and the rules thereunder. 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 Section 16 of the Securities Exchange Act of 1934 or any other
federal securities laws.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 28th day of April, 2005.

/s/ Mahesh Sankaran