POWER OF ATTORNEY

The Undersigned hereby constitutes and appoints Donald R. "Scotty" Walsh
and Beth O. MacLaughlin as his attorneys-in-fact and agents, each acting
alone, with full power of substitution and resubstitution, from such
person and in each person's name, place, and stead, in any and all
capacities, to sign any and all registration statements, amendments
(including post-effective amendments) to any registration  statement, or,
with all exhibits thereto and all documents in connection therewith, as well
as any Form 3, 4 or 5 under Section 16 of the Securities Exchange Act of
1934, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing requisite or necessary to be
done as fully to all intents and purposes as he might or could do in person,
hereby ratifying and confirming all that said attorneys-in-fact and agents
or any of them, or his substitute or substitutes, may lawfully do or cause
to be done by virtue hereof.

Name                      Title                         Date




________/s/___________    Executive Vice President      June 18, 2004
Christopher D. Olander    & General Counsel