function showPopUp(imgpopup) {
        var modalPopupBehavior = $find('PopupBehavior');
        document.getElementById("popupimg").src = imgpopup;
        modalPopupBehavior.show();
    }

    function hidePopUp() {
        var modalPopupBehavior = $find('PopupBehavior');
        modalPopupBehavior.hide();
    }

    function over(l) {
        l.src = "img/boxpiccoloattivo.jpg";
    }

    function esce(l) {
        l.src = "img/boxpiccoloinattivo.jpg";
    }