function IsAJAXEnabled() {return (window.XMLHttpRequest) || (window.ActiveXObject);};

var req;
 
function loadXMLDoc(url) {
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        req.onreadystatechange = processReqChange;
        req.open("GET", url, true);
        req.send(null);
    } else if (window.ActiveXObject) {
        req = new ActiveXObject('Msxml2.XMLHTTP');
        if (!req) {req = new ActiveXObject("Microsoft.XMLHTTP");};
        if (req) {
            req.onreadystatechange = processReqChange;
            req.open("GET", url, true);
            req.send();
        }
    }
}

function processReqChange() {     
    ab = window.setTimeout("req.abort();", 5000);   
    if (req.readyState == 4) {
        clearTimeout(ab);
        if (req.status == 200) {
            document.all.cart.innerHTML = req.responseText;
        } else {
            alert("Товар не добавлен.\nПопробуйте еще раз через нечколько секунд.");
        }
    }  
}