Exhibit A ------------------- ------------------- CUSIP NO. 78464P208 13D PAGE 14 OF 15 PAGES ------------------- ------------------- JOINT FILING AGREEMENT ------------------- ------------------- CUSIP NO. 78464P208 13D PAGE 15 OF 15 PAGES...

                                                                       Exhibit A

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CUSIP NO. 00000X000               13D                        PAGE 14 OF 15 PAGES
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                             JOINT FILING AGREEMENT




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CUSIP NO. 00000X000               13D                        PAGE 15 OF 15 PAGES
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                             JOINT FILING AGREEMENT

               The undersigned, and each of them, do hereby agree and consent to
the filing of a single statement on Schedule 13D and amendments thereto, in
accordance with the provisions of Rule 13d-1(f)(1) of the Securities Exchange
Act of 1934, as amended.

Dated:  September 17, 2003

                                                XXXXXXX & XXXXX ENTERPRISES INC.




                                                By: /s/ Xxxx X. Xxxxxx
                                                    ----------------------------
                                                    Name: Xxxx X. Xxxxxx
                                                    Title: Managing Director



                                                    /s/ Xxxx X. Xxxxxxx
                                                --------------------------------
                                                         Xxxx X. Xxxxxxx



                                                   /s/ Xxxx X. Xxxxxx
                                                --------------------------------
                                                          Xxxx X. Xxxxxx



                                                   /s/ Xxxxx X. XxXxx
                                                --------------------------------
                                                          Xxxxx X. XxXxx



                                                   /s/ Xxxxxx X. Xxxxxx
                                                --------------------------------
                                                         Xxxxxx X. Xxxxxx