How to Validate Form Fields with Pattern and Display Message Bubbles?

I hate to change the subject, but I have a question back on the validate form fields with pattern and display message bubble subject.  How do you correct from invalid to valid entry?  I get the same result in my page as I do in the example page.  Once the field is flagged as invalid it continues to report as invalid even after correction.  Should I be using a change listener in the IOL page?