ldapadmin - better style for alert message
ldapadmin - call the function also when the value is changed

the field may be changing without using keyboard (copy/paste, etc.)
The adecuate event property would be "oninput", but it's too recent, and
spring does not accept it (neither do IE6-8)
ldapadmin - comment
ldapadmin - when password is empty, clear password strongness indications