// JavaScript Document

function checkso(tn){

	var sothuc="0123456789.";

	for (x=0; x<tn.length; x++){

		var sai = false;

	 	for (y=0; y<sothuc.length; y++){

			if(tn.charAt(x) == sothuc.charAt(y)) {sai = true; }				

		}

		if (sai == false) {return false;}

	}

	return true;

}

function checkmail(email){

	if (email == "") return false;

	else {

		if (email.charAt(0) >='0' && email.charAt(0) <='9'){

			return false;

			}

		var phan = email.split("@");

		if (phan.length != 2){

			return false;

			}

		var cham = phan[0].indexOf(".");

		if (phan[0].length < 2){

			return false;

			}

		var phansau = phan[1].split(".");

		if (phansau.length < 2){

			return false;

			}

		if ((phansau[0].length < 2) || (phansau[1].length < 2)){

			return false;

			}

	}

	return true;

}

function checkFrm(){

		if(document.form1.name.value == ""){

			alert("Please input your Name!");

			document.form1.name.focus();

			return false;

		}

		if(document.form1.Email.value == ""){

			alert("Please input your Email!");

			document.form1.Email.focus();

			return false;

		}

		if(checkmail(document.form1.Email.value) == 0){

			alert("Email is invalid!");

			document.form1.Email.focus();

			return false;

		}

		if(document.form1.Location.value == ""){

			alert("Please select your Location!");

			document.form1.Location.focus();

			return false;

		}

	}
	
	//check question
	function checkQuestion(){

		if(document.frmQuestion.Your_Name.value == ""){

			alert("Please input Your Name!");

			document.frmQuestion.Your_Name.focus();

			return false;

		}

		if(document.frmQuestion.Your_Email.value == ""){

			alert("Please input Your Email!");

			document.frmQuestion.Your_Email.focus();

			return false;

		}

		if(checkmail(document.frmQuestion.Your_Email.value) == 0){

			alert("Email is invalid!");

			document.frmQuestion.Your_Email.focus();

			return false;

		}

		if(document.frmQuestion.Your_Question.value == ""){

			alert("Please input Your Question!");

			document.frmQuestion.Your_Question.focus();

			return false;

		}

	}