Thanks a lot Peter! I just have a couple of questions:

What is meant by "The code added above is:" followed by "<input button..." ? I can reconstruct the other patches but I don't understand what's meant here.

I visited the "Try it here:" link but it doesn't work, the message "Fehler auf der Seite" appears in the status line.

Also: What mlf version are the positions for the changes (line numbers) related to?