function Bj(url,target,txt,img_url,block) {
    // native XMLHttpRequest object
        num = document.getElementsByName("element_num_"+block)[0].value;
        cat = document.getElementsByName("element_cat_"+block)[0].value; 
    document.getElementById(target).innerHTML = '<center><img src="'+img_url+'" border="0"/><br />'+txt+'...</center>';
    //Selected # items
    url = url+"&num="+num;
    //Selected categorie
    if(cat!="")
    {
       url = url+"&cat="+cat;
    }
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        req.onreadystatechange = function() {BjDone(target);};
        req.open("GET", url, true);
        req.send(null);
    // IE/Windows ActiveX version
    } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
        if (req) {
            req.onreadystatechange = function() {BjDone(target);};
            req.open("GET", url, true);
            req.send();
        }
    }
}    

function BjDone(target) {
    // only if req is "loaded"
    if (req.readyState == 4) {
        // only if "OK"
        if (req.status == 200) {
            results = req.responseText;
            document.getElementById(target).innerHTML = results;
        } else {
            document.getElementById(target).innerHTML="Bj error:\n" +
                req.statusText;
        }
    }
}