var contact_us_sending = false;
function contactUS(){
	document.getElementById('contact_result').innerHTML="";
	if (document.getElementById('contact_name').value.length < 1){
		alert("กรุณากรอกชื่อผู้ติดต่อ");
		return false;
	}
	if (document.getElementById('contact_phone').value.length < 1 && document.getElementById('contact_email').value.length < 1){
		alert("กรุณากรอกหมายเลขติดต่อกลับหรืออีเมล์");
		return false;
	}
	if (document.getElementById('contact_detail').value.length < 1){
		alert("กรุณากรอกรายละเอียดในการติดต่อ")
		return false;
	}

	var contact_name = document.getElementById('contact_name').value;
	var contact_phone = document.getElementById('contact_phone').value;
	var contact_email = document.getElementById('contact_email').value;
	var contact_detail = document.getElementById('contact_detail').value;

	var myConn = new XHConn();
	if (!myConn) alert("XMLHTTP not available. Try a newer/better browser.");

	var DataToSend = "cmd=contact&contact_name=" + contact_name + "&contact_phone=" + contact_phone + "&contact_email=" + contact_email + "&contact_detail=" + contact_detail;

	if (contact_us_sending == false){
		contact_us_sending = true;
		var fnWhenDone = function (oXML) { 
			if(oXML.responseText=="OK"){
				document.getElementById('contact_result').innerHTML='<font color="#8a00da">ข้อความของคุณ ได้รับการบันทึกเรียบร้อยแล้ว</font>';
				document.getElementById('contact_name').disabled = true;
				document.getElementById('contact_phone').disabled = true;
				document.getElementById('contact_email').disabled = true;
				document.getElementById('contact_detail').disabled = true;
				document.getElementById('confirm_submit').disabled = true;
				document.getElementById('reset_submit').disabled = true;
			}else{
				document.getElementById('contact_result').innerHTML='<font color="#FF0000">พบข้อผิดพลาด กรุณาลองใหม่อีกครั้ง</font>';
				document.getElementById('confirm_submit').disabled = false;
				document.getElementById('reset_submit').disabled = false;
			}
			contact_us_sending = false;
		};
		document.getElementById('confirm_submit').disabled = true;
		document.getElementById('reset_submit').disabled = true;	
		document.getElementById('contact_result').innerHTML='<font color="#fca126">โปรดรอซักครู่... กำลังดำเนินการ</font>';
		myConn.connect("contact_submit.php", "POST", DataToSend, fnWhenDone);
	}
	return false;
}