var http_request = false;
   function makePOSTRequest(url, parameters) {
      http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         document.getElementById('Preview').innerHTML = GetMessageHtml('Not able to update preview');
         return false;
      }
      
      http_request.onreadystatechange = updateContents;
      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 updateContents() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            //alert(http_request.responseText);
            result = http_request.responseText;
			var cartcontents = " " + http_request.getResponseHeader("cartContents");
			document.getElementById('cartcontents').innerHTML = cartcontents;
			document.getElementById('CartHtml').innerHTML = result;
         } else {
            document.getElementById('CartHtml').innerHTML = 'Error Loading Shopping Cart Data';
         }
         //document.getElementById('BusyStatus').innerHTML = '';
      }
   }
   
   
function EmptyCart() {
	document.getElementById('BusyStatus').innerHTML = 'Updating...';
	var poststr = "Action=EmptyCart";
	makePOSTRequest('/cart-contents.htm', poststr);
}

function RemoveItem(c,i) {
	document.getElementById('BusyStatus').innerHTML = 'Updating...';
	var poststr = "Action=RemoveItem&i=" + i + "&c=" + c;
	makePOSTRequest('/cart-contents.htm', poststr);
}

function SetShipping(s) {
  document.getElementById("PayPalShippingAmount").value = s;
}