Feedback ARIA Alert example

I have created a Alert box example.  I would appreciate some feedback on the accessibility and features.

http://devserv.rehab.uiuc.edu/ita/jongund/citaweb/test/aria/alert/alert1.php


Jon
Jon Gunderson, Ph.D.
Coordinator Information Technology Accessibility
Disability Resources and Educational Services

Rehabilitation Education Center
Room 86
1207 S. Oak Street
Champaign, Illinois 61821

Voice: (217) 244-5870

WWW: http://www.cita.uiuc.edu/
WWW: https://netfiles.uiuc.edu/jongund/www/