// JavaScript Document
function checkMail(email) {
	var x = email;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(x)) return true;
	else return false;
}

function checkContactUs(myForm) {
	contactPerson = myForm.contactPerson;
	country = myForm.country;
	email = myForm.email;
	tel = myForm.tel;
	message = myForm.message;
	var sendFlag = true;
	
	if (contactPerson.value == "" && sendFlag){
		alert("請輸入您的姓名。");
		sendFlag = false;
		contactPerson.focus();
	}
	if (email.value == "" && sendFlag){
		alert("請輸入您的電郵。");
		sendFlag = false;
		email.focus();
	} else if (!checkMail(email.value) && sendFlag) {
		alert("電郵格式不正確。請重新輸入。");
		sendFlag = false;
		email.focus();
	}
	
	if (message.value == "" && sendFlag){
		alert("請輸入您的查詢內容。");
		sendFlag = false;
		message.focus();
	}

	if (sendFlag) {
		document.getElementById('btnReset').disabled = "disabled";
		document.getElementById('btnSubmit').disabled = "disabled";
	}
	
	return sendFlag;
}