Power of Attorney

     Each person whose signature  appears below 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 with the Securities and Exchange Commission any and
all Annual Reports on Form 10-K or equivalent form (including any thereto), with
all exhibits thereto and all documents in connection  therewith,  as well as any
Form ID,  Form 3, 4 or 5, or  equivalent  form  filed  under  Section  16 of the
Securities  Exchange  Act of 1934,  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
- --------------------------------------------------------------------------------

                                      Chief Executive Officer  December __, 2004
- ----------------------------------      and Director
Donald "Scotty" Walsh


/s/ W. James Hindman                  Chairman of the Board    December 3, 2004
- ----------------------------------
W. James Hindman

                                      Vice-Chairman of the     December __, 2004
- ----------------------------------      Board
Garnett Y. Clark, Jr.

                                      Director                 December __, 2004
- ----------------------------------
Edgar D. Aronson

                                      Director                 December __, 2004
- ----------------------------------
George Cox

                                      Director                 December __, 2004
- ----------------------------------
Eugene J. Fischer

                                      Director                 December __, 2004
- ----------------------------------
Robert Post

                                      President and Chief      December __, 2004
- ----------------------------------      Operating Officer
F. Scott Harris

                                      (N/A)                    December __, 2004
- ----------------------------------
Henry D. Felton