Exhibit B JOINT FILING AGREEMENT This Agreement is filed as an exhibit to Schedule 13G 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 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 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 and any
         amendments thereto and for the completeness and accuracy of the
         information concerning such persons contained therein.


         Dated: July 12, 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