function changeBC(obj, color) {
  obj.style.backgroundColor = color;
}
function changeForm(formId, formId2) {
  document.getElementById(formId).style.display = "block";
  document.getElementById(formId2).style.display = "none";
}
function $_V(id) {
  return document.getElementById(id);
}
function $F_V(id) {
  return document.getElementById(id).value;
}

var mailReg = /\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/;