function validate_required(field,alerttxt){
	with (field){
		if (value==null||value==""){
			alert(alerttxt);
			return false;
		}
		return true;
	}
}

function validate_email(field,alerttxt){
	with (field){
		apos=value.indexOf("@");
		dotpos=value.lastIndexOf(".");
		if (apos<1||dotpos-apos<2){
			alert(alerttxt);
			return false;
		}
		return true;
	}
}

function validate_RegisterForm(thisform){
	with (thisform){
		if(!validate_required(lname, "必須填寫姓名")){
			lname.focus();
			return false;
		}
		if(!validate_required(fname, "必須填寫姓名")){
			fname.focus();
			return false;
		}
		if(!validate_required(email, "必須填寫電郵")){
			email.focus();
			return false;
		}
		if(!validate_email(email,"電郵格式不正確")){
			email.focus();
			return false;
		}
		if(!validate_required(phone, "必須填寫電話")){
			phone.focus();
			return false;
		}
		if(!validate_required(pw, "必須填寫密碼")){
			pw.focus();
			return false;
		}
		if( document.registerForm.pw.value != document.registerForm.cpw.value) {
			  alert("確認密碼不正確");
			  document.registerForm.cpw.focus();
		  return false;
		}
	}
	return true;
}

function validate_ForgotPWForm(thisform){
	with (thisform){		
		if(!validate_required(username, "必須填寫電郵")){
			username.focus();
			return false;
		}
		if(!validate_email(username,"電郵格式不正確")){
			username.focus();
			return false;
		}
	}
	return true;
}

function validate_MyProfileForm(thisform){
	with (thisform){
		if(!validate_required(lname, "必須填寫姓名")){
			lname.focus();
			return false;
		}
		if(!validate_required(fname, "必須填寫姓名")){
			fname.focus();
			return false;
		}
		if(!validate_required(email, "必須填寫電郵")){
			email.focus();
			return false;
		}
		if(!validate_email(email,"電郵格式不正確")){
			email.focus();
			return false;
		}
		if(!validate_required(phone, "必須填寫電話")){
			phone.focus();
			return false;
		}
		if( document.myprofileForm.pw.value != document.myprofileForm.cpw.value) {
			  alert("確認密碼不正確");
			  document.myprofileForm.cpw.focus();
		  return false;
		}
	}
	return true;
}



function validate_contactusForm(thisform){
	with (thisform){
		if(!validate_required(q_name, "必須填寫姓名")){
			q_name.focus();
			return false;
		}
		if(!validate_required(q_tel, "必須填寫電話")){
			q_tel.focus();
			return false;
		}
		if(!validate_required(q_email, "必須填寫電郵")){
			q_email.focus();
			return false;
		}
		if(!validate_email(q_email,"電郵格式不正確")){
			q_email.focus();
			return false;
		}
		if(!validate_required(q_subject, "必須填寫主旨")){
			q_subject.focus();
			return false;
		}
		if(!validate_required(query, "必須填寫內容")){
			query.focus();
			return false;
		}
	}
	return true;
}