function addLoadEvent(func) {
    var oldonload = window.onload;
        if (typeof window.onload != 'function') {
            window.onload = func;
        } else {
            window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
}


if (document.images) {

 classeson = new Image();
 classeson.src = "/images/menu_classes_on.gif";

 classesoff = new Image();
 classesoff.src = "/images/menu_classes_off.gif";

 cateringon = new Image();
 cateringon.src = "/images/menu_catering_on.gif";

 cateringoff = new Image();
 cateringoff.src = "/images/menu_catering_off.gif";

 consultationon = new Image();
 consultationon.src = "/images/menu_consultation_on.gif";

 consultationoff = new Image();
 consultationoff.src = "/images/menu_consultation_off.gif";

 abouton = new Image();
 abouton.src = "/images/menu_about_on.gif";

 aboutoff = new Image();
 aboutoff.src = "/images/menu_about_off.gif";

 contacton = new Image();
 contacton.src = "/images/menu_contact_on.gif";

 contactoff = new Image();
 contactoff.src = "/images/menu_contact_off.gif";

 blogon = new Image();
 blogon.src = "/images/menu_blog_on.gif";

 blogoff = new Image();
 blogoff.src = "/images/menu_blog_off.gif";

 buzzon = new Image();
 buzzon.src = "/images/menu_buzz_on.gif";

 buzzoff = new Image();
 buzzoff.src = "/images/menu_buzz_off.gif";

 }