function inputEmail(fieldObj) {
  if (fieldObj.value == "Enter email address..." ||
      fieldObj.value == "輸入電郵地址..." ||
      fieldObj.value == "输入电邮地址...") {
    fieldObj.value = "";
  }
}

function preloadValue(value) {
  var fieldEmail = document.getElementById("email");
  fieldEmail.value = value;
}