function refreshNet(methd, URL, data) {
        var xhr_object = null;
        if( window.XMLHttpRequest ) // Firefox
                xhr_object = new XMLHttpRequest();
        else if( window.ActiveXObject ) // Internet Explorer
                xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
                else { // XMLHttpRequest non supporté par le navigateur
                        //alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest...");
                        return;
                }
                xhr_object.open(methd, URL, true );
                xhr_object.onreadystatechange = function() {
                if(xhr_object.readyState == 4) {
                        //alert( xhr_object.responseText );
                        eval( xhr_object.responseText );
                }
        }
        xhr_object.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        xhr_object.send(data);
}