JOINT FILING AGREEMENT

                                                                       Exhibit 1

                             JOINT FILING AGREEMENT



Pursuant to Rule 13d-1(k)(1)(iii) promulgated under the Securities Exchange Act
of 1934, as amended, each of the undersigned agrees that the Statement on
Schedule 13D, to which this exhibit is attached, is filed on its behalf.

Dated: July 2, 2003


                                        /s/  Xxxx X. Xxxxxxxx
                                        ----------------------------------------
                                        Xxxx X. Xxxxxxxx

                                        PMM GK INVESTMENT LLC


                                        By: /s/  Xxxx X. Xxxxxxxx
                                            ------------------------------------
                                            Xxxx X. Xxxxxxxx, as Manager


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


                                        XXXXXX ASSOCIATES FAMILY, L.P.


                                        By: /s/  Xxxx X. Xxxxxxxx
                                            ------------------------------------
                                            Xxxx X. Xxxxxxxx, as General Partner