function setFocus() {
  var loginForm = document.getElementById("login");
  if (loginForm) {
    loginForm["session[email]"].focus();
  }
  var signupForm = document.getElementById("new_user");
  if (signupForm) {
    signupForm["user[email]"].focus();
  }
  var signupFormMain = document.getElementById("sign_up");
  if (signupFormMain) {
    signupFormMain["user[username]"].focus();
  }
}