customize HTTP Status 401 error page

[Jill Han]

If using Basic authentication, the unsuccessful login, or just click "Cancel" 
button will trigger the 401 page.
My question is 
1. is there a way to customize "cancel" action? So there will be no error 
message prompted.
2. Is there a way to customize tomcat HTTP Status 401 error message to a more 
user meaningful one?

Thanks,
Jill