lengthen the email row digits at the guestbook entry page

Hi,
my guestbook works fine and its the best I have ever had. I even could include it and fit it to my webdesign without any problems.

Last week then somebody was signing in my guestbook and wrote the the email row was to short for his email. I checked it and its true - its only 30 digits for my Advanced Guestbook. How I can lenghten it to for example 40 oder 35 digits? I couldn't find it
thanks for your help
Felix

templates/form.phpchange the maxlength. There is 60 characters possible for the database entry so I'd suggest a maxlength of 50, 55 at most.

thanks it worked fine!!!