I was changing from Light Edition to Professional. A good idea with great help from Albert Wiersch. There is remaining this one thing under "General Accessibility" for my site http://www.koerperbehinderte-es.de/kontaktformular.html
I am no expert in java, so I cannot repair.
The reason why I have java her: The form is not be send by pressing "Enter" in the form, only by klicking the button "Absenden".
I hope, my problem can be understand.
(from Germany, excuse my English)