function test()
{
    window.alert("bla");
}

function returnReq(url)
{
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
    }
    req.open("GET", url, true);
    req.setRequestHeader("If-Modified-Since", "Thu, 1 Jan 1970 00:00:00 GMT");
    req.setRequestHeader("Cache-Control", "no-cache");
    return req;
}