function confirmDelete() {
  if (confirm('Are you sure you want to remove this item?')) {
    return true;
  } else {
    return false;
  }
}

function checkCustomer() {
  form = document.forms[0];

  if (form.terms.checked != true) {
    form.action = 'details.php?formerror=terms';
  }

  if (form.confirm.checked != true) {
    form.action = 'details.php?formerror=confirm';
  }

  if (form.firstname.value == '' || form.lastname.value == '' || form.house.value == '' || form.street.value == '' || form.postcode.value == '' || form.telephone.value == '') {
    form.action = 'details.php?formerror=mandatory';
  }
}