Exhibit B JOINT FILING AGREEMENT This Agreement is filed as an exhibit to Schedule 13G/A being filed by Potomac Capital Management LLC, Potomac Capital Management Inc., and Paul J. Solit in compliance with Rule 13d-1(k) of the Securities and Exchange...

Exhibit B



                             JOINT FILING AGREEMENT

                     This Agreement is filed as an exhibit to Schedule 13G/A
         being filed by Potomac Capital Management LLC, Potomac Capital
         Management Inc., and Xxxx X. Xxxxx in compliance with Rule 13d-1(k) of
         the Securities and Exchange Commission, which requires an agreement in
         writing indicating that the Schedule 13G/A to which this Agreement is
         attached is filed on behalf of the below-named entities, that they are
         each responsible for the timely filing of the Schedule 13G/A and any
         amendments thereto and for the completeness and accuracy of the
         information concerning such persons contained therein.


         Dated: March 31, 2005

                                         POTOMAC CAPITAL MANAGEMENT LLC

                                         By:    /s/      Xxxx X. Xxxxx
                                               -----------------------
                                                Xxxx X. Xxxxx, Managing Member

                                         POTOMAC CAPITAL MANAGEMENT INC.

                                         By:    /s/     Xxxx X. Xxxxx
                                               ---------------------
                                               Xxxx X. Xxxxx, President


                                         XXXX X. XXXXX

                                         By:    /s/ Xxxx X. Xxxxx
                                                ---------------------
                                                Xxxx X. Xxxxx