I also want the user to choose a date I will make this with another dropdownbox. But if the first month is selected, then there should be 31 days in the days dropdownbox, if the second month is selected there should be 28 days in the dropdownbow.
I know this isn't the solution to your problem (the solution would be to use JavaScript), but if I was a user, I'd rather type in the day number myself than have to choose from a 31-long dropdown. Why don't you just give the user a text field and then validate the input.
Just my 2 cents..
-- Timo Virkkala -- http://mail.python.org/mailman/listinfo/python-list