// AJAX
var http_request = false;

function makePOSTRequest(url, parameters) {
  http_request = false;
  if (window.XMLHttpRequest) {
	 http_request = new XMLHttpRequest();
	 if (http_request.overrideMimeType) {		 
		http_request.overrideMimeType('text/html');	
	}	
  } else if (window.ActiveXObject) {
	 try {
		http_request = new ActiveXObject("Msxml2.XMLHTTP");
	 } catch (e) {
		try {
		   http_request = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (e) {}
	 }
  }
  if (!http_request) {
	 alert('Cannot create XMLHTTP instance');
	 return false;
  }
  http_request.onreadystatechange = alertContents;
  http_request.open('POST', url, true);
  http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  http_request.setRequestHeader("Content-length", parameters.length);
  http_request.setRequestHeader("Connection", "close");
  http_request.send(parameters);
}

function alertContents() {
  if (http_request.readyState == 4) {
	 if (http_request.status == 200) {
		result = http_request.responseText;
		data = result.split('*');
		prodid = data[0];
		numitems = data[1];
		total = data[2];
		added = "Item added to basket";
		document.getElementById('bsk'+prodid).innerHTML = added;
		document.getElementById('myitems').innerHTML = numitems;
		document.getElementById('totcost').innerHTML = total;
	 } else {
		alert('There was a problem with the request.\n Please try again.');
	 }
  }
}

function additem(prodid, size, price) {
	var prodid = prodid;
	var size = size;
	var price = price;
	var qtyIndex = document.getElementById('qty' + prodid).selectedIndex;
	var qty = document.getElementById('qty' + prodid)[qtyIndex].value
	if (size == 1) {
		var szIndex = document.getElementById('size' + prodid).selectedIndex;
		var thesize = document.getElementById('size' + prodid)[szIndex].value
	} else {
		thesize = 0;	
	}
	var poststr = "prodid=" + prodid +
				  "&qty=" + qty +
				  "&size=" + thesize +
				  "&price=" + price;
	makePOSTRequest('ajax/additem.php', poststr);
}

///