POWER OF ATTORNEY

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The Undersigned hereby constitutes and appoints Donald R. "Scotty" Walsh
and Christopher D. Olander 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 and file any and all 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
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  /s/ Lawrence Rychlak     Vice President - Finance and    May 17, 2005
______________________     Chief Financial Officer
Lawrence Rychlak