EXHIBIT A

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that the Schedule 13D/A to which this Joint Filing Agreement is being filed as an exhibit shall be a joint statement filed on behalf of each of the undersigned.


Date: February 14, 2003	AUSTIN VENTURES VII, L.P.

	By:	AV Partners VII, L.P., its general partner

		By: /s/ Kenneth P. DeAngelis Name: Kenneth P. DeAngelis Title: General Partner

	AUSTIN VENTURES VIII, L.P.

	By:	AV Partners VIII, L.P., its general partner

		By: /s/ Kenneth P. DeAngelis Name: Kenneth P. DeAngelis Title: General Partner

	AV PARTNERS VII, L.P.

	By: /s/ Kenneth P. DeAngelis Name: Kenneth P. DeAngelis Title: General Partner

	AV PARTNERS VIII, L.P.

	By: /s/ Kenneth P. DeAngelis Name: Kenneth P. DeAngelis Title: General Partner

	/s/ Joseph C. Aragona Joseph C. Aragona

	/s/ Kenneth P. DeAngelis Kenneth P. DeAngelis

	/s/ Edward E. Olkkola Edward E. Olkkola


		/s/ John D. Thornton John D. Thornton

		/s/ Blaine F. Wesner Blaine F. Wesner

		/s/ Christopher A. Pacitti Christopher A. Pacitti

AUSTIN VENTURES VII LP SC 13D/A