1. Make a form that asks for the persons email address and age.
2. If enters into the age field a number less than 12, complain with an alert box. Use onChange.
3. If the person's email address does not have an '@' sign, complain. Use onChange and indexOf or regular expressions.
4. If they try and submit and the person is less 12 years old, take them to pbskids.org. Use redirect.
5. If the person enteres a non-number in the age field, complain an alert box. You can check this.
6. Convert the years into days. When the age field changes, change the day field. Use onChange on the age field and innerHTML to change the day field.