var xmlhttp

function add2Cart(str) {
    xmlhttp = GetXmlHttpObject();
    if (xmlhttp == null) {
        alert("Your browser does not support AJAX!");
        return;
    }
    var url = "/add2cart.aspx";
    url = url + "?prodID=" + str;
    url = url + "&sid=" + Math.random();
    xmlhttp.onreadystatechange = stateChanged;
    xmlhttp.open("GET", url, true);
    xmlhttp.send(null);
}

function stateChanged() {
    if (xmlhttp.readyState == 4) {
        document.getElementById("mini-basket").innerHTML = xmlhttp.responseText;
    }
}

function GetXmlHttpObject() {
    if (window.XMLHttpRequest) {
        // code for IE7+, Firefox, Chrome, Opera, Safari
        return new XMLHttpRequest();
    }
    if (window.ActiveXObject) {
        // code for IE6, IE5
        return new ActiveXObject("Microsoft.XMLHTTP");
    }
    return null;
}