function GetNumberOfProduct()
{
    http = createRequestObject();
    http.open('GET', '/WebShop/GetCartSize.asp', true);
    http.onreadystatechange = handleAJAXReturn;
    http.send(null);
}

function handleAJAXReturn()
{
    var oCart;
    if (http.readyState == 4)
    {
        if (http.status == 200)
        {
            if (document.getElementById)
                oCart=document.getElementById("idCartNumber")
            else 
                if (document.all) 
                    oCart=document.all["idCartNumber"];
            if (typeof(oCart)!="undefined") oCart.innerHTML = http.responseText;
        }
    }
}

function createRequestObject()
{
    var http;
    if (window.XMLHttpRequest)
    { // Mozilla, Safari, IE7 ...
        http = new XMLHttpRequest();
    }
    else if (window.ActiveXObject)
    { // Internet Explorer 6
        http = new ActiveXObject("Microsoft.XMLHTTP");
    }
    return http;
}