errorCheck.js

function errorCheck(form) {\
  if (form.firstName.value == "") {
    errorReport("firstName", "is empty")
  }
  if (form.lastName.value == "") {
    errorReport("lastName", "is empty")
  }

  var email_re = /[A-Z0-9._]+@[A-Z0-9.]+\.[A-Z]{2,}/
  if (!email_re.exec(form.emailAddress.value)){
    errorReport("emailAddress", 'is invalid')
  }

  var re = /\d\d\/\d\d\/\d\d\d\d/
  if (!re.exec(form.dateOfBirth.value)) {
    errorReport("dateOfBirth", 'is invalid')
  }
}