/* Create HttpRequest Object */
var XMLHttpRequestObject = false;
	
	if (window.XMLHttpRequest) {
		XMLHttpRequestObject = new XMLHttpRequest();
	} else if (window.ActiveXObject) {
		XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");
	}

/* Retrieve username & password from form. Send to be authenticated.
Retreive response text
//alert('ajaxUrl:' + ajax_url +'\n ID:'+ product_id + '\n type:' + product_type);
//alert('new url: ' + url);

*/
function addItemToCart(ajax_url, product_id){
	var qty 	= document.getElementById('cart_qty').value;
	var url 	= ajax_url + "?qty=" + qty + "&product_id=" + product_id;
	if(XMLHttpRequestObject) {

		XMLHttpRequestObject.open("GET", url, true);
		
		XMLHttpRequestObject.onreadystatechange = function(){
			if (XMLHttpRequestObject.readyState == 4 && XMLHttpRequestObject.status == 200) {
				document.getElementById('div_num_of_cart_items').innerHTML = XMLHttpRequestObject.responseText;
			}
		}
		XMLHttpRequestObject.send(null);
	}		
}