function facebook_condivisione() {
            u=location.href;
            //u=location.href+'&utm_source=facebook&utm_medium=socialnetwork&utm_content=textlink&utm_campaign=sharer';
            //alert(u);
            t=document.title;
            window.open('http://www.facebook.com/sharer.php?u='+encodeURIComponent(u)+'&utm_source=facebook&utm_medium=socialnetwork&utm_content=textlink&utm_campaign=sharer&t='+encodeURIComponent(t),'sharer','toolbar=0,status=0,width=626,height=436');
            return false;
        }