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: September 3, 2008

                                            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