EXHIBIT 24

POWER OF ATTORNEY

KNOW ALL BY THESE PRESENT, that Harrison H Augur, whose signature appears below,
constitutes and appoints Mark W. Harding as attorney-in-fact and agent for the
undersigned solely for the purpose of executing reports required under Section
13 and 16 of the Securities and Exchange Act of 1934, and filing the same, with
exhibits thereto, and other documents in connection therewith, with the
Securities and Exchange Commission, thereby ratifying and confirming all that
said attorneys-in-fact have done or caused to be done, or may do or cause to
be done, by virtue hereof.

The undersigned further agrees to indemnify and hold harmless each appointee
against any liability for any actions performed by that appointee in good
faith on behalf of the undersigned pursuant to this power of attorney.

This power of attorney shall remain in effect until revoked by a subsequent
written instrument.

Dated:  May 9, 2005

/s/ Harrison H. Augur
Harrison H. Augur