var xmlhttp;

function validateDiscount(str,locId)
{
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
var url="inc/reg_discount.php";
url=url+"?q="+str+"&locId="+locId;
url=url+"&sid="+Math.random();
xmlhttp.onreadystatechange=stateChanged;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function stateChanged() {
	if (xmlhttp.readyState==4) {
		xmlDoc=xmlhttp.responseXML;
	
		if (xmlDoc.getElementsByTagName("invalid")[0].childNodes[0].nodeValue == "DNE") {
			document.getElementById("discount").value =  "";
			document.getElementById("discount_type").value =  "";
			document.getElementById("discount_subtype").value =  "";
			document.getElementById("discount_amount").value =  0;
			
			document.getElementById("discount_span").innerHTML = "Discount code not found, please try entering again.";
			document.getElementById("discount_message").style.display = "block";
		}
		else if (xmlDoc.getElementsByTagName("invalid")[0].childNodes[0].nodeValue == "USED") {
			document.getElementById("discount").value =  "";
			document.getElementById("discount_type").value =  "";
			document.getElementById("discount_subtype").value =  "";
			document.getElementById("discount_amount").value =  0;
			
			document.getElementById("discount_span").innerHTML = "Discount code has already been used.";
			document.getElementById("discount_message").style.display = "block";
		}
		else if (xmlDoc.getElementsByTagName("invalid")[0].childNodes[0].nodeValue == "USE_FOR") {
			document.getElementById("discount").value =  "";
			document.getElementById("discount_type").value =  "";
			document.getElementById("discount_subtype").value =  "";
			document.getElementById("discount_amount").value =  0;
			
			document.getElementById("discount_span").innerHTML = "Discount code not valid for registrations.";
			document.getElementById("discount_message").style.display = "block";
		}
		else if (xmlDoc.getElementsByTagName("invalid")[0].childNodes[0].nodeValue == "DATE") {
			document.getElementById("discount").value =  "";
			document.getElementById("discount_type").value =  "";
			document.getElementById("discount_subtype").value =  "";
			document.getElementById("discount_amount").value =  0;
			
			document.getElementById("discount_span").innerHTML = "Discount code can not be used at this time.";
			document.getElementById("discount_message").style.display = "block";
		}
		else {
			document.getElementById("discount").value =  xmlDoc.getElementsByTagName("id")[0].childNodes[0].nodeValue;
			document.getElementById("discount_type").value =  xmlDoc.getElementsByTagName("type")[0].childNodes[0].nodeValue;
			document.getElementById("discount_subtype").value =  xmlDoc.getElementsByTagName("subtype")[0].childNodes[0].nodeValue;
			document.getElementById("discount_amount").value =  xmlDoc.getElementsByTagName("discount")[0].childNodes[0].nodeValue;
			
			if (xmlDoc.getElementsByTagName("type")[0].childNodes[0].nodeValue == 'percent') {
				document.getElementById("discount_span").innerHTML = "A discount of "+xmlDoc.getElementsByTagName("discount")[0].childNodes[0].nodeValue+"% has been applied.";
			}
			else {
				document.getElementById("discount_span").innerHTML = "A discount of $"+xmlDoc.getElementsByTagName("discount")[0].childNodes[0].nodeValue+" has been applied.";
			}
			document.getElementById("discount_message").style.display = "block";
		}
		showTotal();
	}
}

function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}