function chkContact(frm){
	var x = document.getElementById("Image_Value").value;
	var y = document.getElementById("Image_Answer").value;
	var x = x.toLowerCase();
	var y = y.toLowerCase();

	if ((frm.ContactName.value.length == 0)||(frm.Location.value.length == 0)||(frm.Email.value.length == 0)||(frm.PhoneNo.value.length == 0)||(frm.Image_Answer.value.length == 0)||(frm.LearnFrom.value.length == 0)){
		alert("T\u00EAn, Qu\u1ED1c gia, Email, \u0110i\u1EC7n tho\u1EA1i v\u00E0 Code X\u00E1c Nh\u1EADn l\u00E0 c\u00E1c tr\u01B0\u1EDDng b\u1EAFt bu\u1ED9c. \u0110\u1EC1 ngh\u1ECB b\u1EA1n ho\u00E0n thi\u1EC7n tr\u01B0\u1EDBc khi \u0111\u0103ng k\u00FD");
		return false;
	}

	if (frm.Email.value.indexOf("@") == -1){
		alert("Vui l\u00f2ng \u0111i\u1ec1n \u0111\u00fang \u0111\u1ecba ch\u1ec9 email c\u00f3 gi\u00e1 tr\u1ecb.");
		frm.Email.focus();
		return false;
	}

	if (x != y){
		alert("Code X\u00E1c Nh\u1EADn ch\u01B0a ch\u00EDnh x\u00E1c, \u0111\u1EC1 ngh\u1ECB \u0111i\u1EC1n l\u1EA1i");
		frm.Image_Answer.focus();
		return false;
	}
}

function chkSubscribe(frm){
	if ((frm.Firstname.value.length == 0)||(frm.Lastname.value.length == 0)||(frm.Email.value.length == 0)||(frm.eadd2.value.length == 0)){
		alert("T\u00ean, H\u1ecd v\u00e0 Email l\u00e0 nh\u1eefng ph\u1ea7n b\u1eaft bu\u1ed9c.\nVui l\u00f2ng \u0111i\u1ec1n ho\u00e0n ch\u1ec9nh tr\u01b0\u1edbc khi g\u1eedi.");
		return false;
	}

	if (frm.Email.value.indexOf("@") == -1){
		alert("Vui l\u00f2ng \u0111i\u1ec1n \u0111\u00fang \u0111\u1ecba ch\u1ec9 email c\u00f3 gi\u00e1 tr\u1ecb.");
		frm.Email.focus();
		return false;
	}
	
	if (document.getElementById("Email").value != document.getElementById("eadd2").value){
		alert("\u0110\u1ecba ch\u1ec9 email c\u1ee7a b\u1ea1n kh\u00f4ng \u0111\u00fang. Vui l\u00f2ng \u0111i\u1ec1n l\u1ea1i.");
		frm.Email.focus();
		return false;
	}
}

function chkMailFriend(frm){
	if (frm.tomail.value.length == 0){
		alert("\u0110\u1ecba ch\u1ec9 email ng\u01b0\u1eddi nh\u1eadn. \u0110\u00e2y l\u00e0 ph\u1ea7n b\u1eaft bu\u1ed9c.");
		return false;
	}
	else {
		if (frm.tomail.value.indexOf("@") == -1){
			alert("Vui l\u00f2ng \u0111i\u1ec1n \u0111\u00fang \u0111\u1ecba ch\u1ec9 email c\u00f3 gi\u00e1 tr\u1ecb.");
			frm.tomail.focus();
			return false;
		}
	}
}

function showTextBox(Option) {
	if ((Option.value == "Attended event/exhibition")||(Option.value == "Saw advertisement in print media")||(Option.value == "Saw online advertisement")||(Option.value == "Read an article about Crown")||(Option.value == "Read a Crown publication")||(Option.value == "Yellow pages/business directory in print media")||(Option.value == "Yellow pages/business directory online")||(Option.value == "Other")){
		document.getElementById("Other").style.display = "block";
	}
	else {
		document.getElementById("Other").style.display = "none";
	}
}