// JavaScript Document
function GetXmlHttpObject()
{
	var xmlHttp=null;
	try
	{
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	}
	catch (e)
	{
		// Internet Explorer
		try
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}


function add_to_ajax_cart(product_id)
{
	xmlHttp=GetXmlHttpObject();
	if(xmlHttp==null)
	{
	  alert ("Your browser does not support AJAX!");
	  return;
	}
	var url="add_to_cart_ajax.php?product_id="+product_id;
	xmlHttp.onreadystatechange=addToAjaxCart;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function addToAjaxCart()
{
	if(xmlHttp.readyState==4) 
	{
		document.getElementById('order_total').innerHTML=xmlHttp.responseText;
	}
}