Exhibit A JOINT FILING UNDERTAKINGYorktown Avenue Capital, LLC • June 29th, 2006 • Services-management services
Company FiledJune 29th, 2006 IndustryThe 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.