EXHIBIT 1 JOINT FILING UNDERTAKING The undersigned, being duly authorized thereunto, hereby execute this agreement as an exhibit to this Schedule 13D to evidence the agreement of the below-named parties, in accordance with the rules promulgated...

                                    EXHIBIT 1

                            JOINT FILING UNDERTAKING

The undersigned, being duly authorized thereunto, hereby execute this agreement
as an exhibit to this Schedule 13D to evidence the agreement of the below-named
parties, in accordance with the rules promulgated pursuant to the Securities
Exchange Act of 1934, to file this Schedule jointly on behalf of each such
party.

Dated as of December 20, 2005

PARKCENTRAL GLOBAL HUB LIMITED


By:  /S/ XXXXX XXXXXXXX
     ----------------------------------
     Name:  Xxxxx Xxxxxxxx
     Title: Chief Operating Officer
            Parkcentral Capital Management, L.P.
            Advisor to Parkcentral Global Hub Limited


PETRUS SECURITIES, LP


By:  /s/ XXXXX XXXXXXXX
     ----------------------------------
     Name:  Xxxxx Xxxxxxxx
     Title: Chief Operating Officer