// JavaScript Document

String.prototype.Trim = function() { 
	return this.replace(/(^\s*)|(\s*$)/g, ""); 
} 

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) {
	var contactPerson = myForm.contactPerson;
	var tel = myForm.tel;
	var email = myForm.email;
	var message = myForm.message;
	var lang = myForm.lang;
	var sendFlag = true;
	
	if (contactPerson.value.Trim() == "" && sendFlag){
		if(lang.value =="en")
		alert("Please input the name of contact person");
		else
		alert("請輸入聯絡人名稱。");
		sendFlag = false;
		contactPerson.focus();
	}
	if (email.value.Trim() == "" && sendFlag){
		if(lang.value =="en")
		alert("Please enter your email");
		else
		alert("請輸入電郵地址。");
		sendFlag = false;
		email.focus();
	} else if (!checkMail(email.value.Trim()) && sendFlag) {
		if(lang.value =="en")
		alert("Invalid email. Please input a correct email");
		else
		alert("聯絡電郵不正確。請重新輸入。");
		sendFlag = false;
		email.focus();
	}
		
	if (message.value.Trim() == "" && sendFlag){
		if(lang =="en")
		alert("Please input your message.");
		else
		alert("請輸入查詢內容。");
		sendFlag = false;
		message.focus();
	}
	
	if (sendFlag) {
		myForm.btnSubmit.disabled = "disabled";
	}
	
	return sendFlag;
}