function verifyRequired() {
  if (document.icpsignup["fields_email"].value == "") {
    document.icpsignup["fields_email"].focus();
    alert("The Email field is required.");
    return false;
  }

    if (
      !document.icpsignup["listid:23992"].checked &&
      !document.icpsignup["listid:23993"].checked &&
      !document.icpsignup["listid:23994"].checked &&
      !document.icpsignup["listid:23995"].checked &&
      true)  {
    alert("Please select at least one list.");
    return false;
  }

return true;
}