function stampadiv() {
var testo= "
";
testo+= document.getElementById('center').innerHTML+"";
var ident_finestra = window.open("","finestra_stampa","height=400,width=400");
ident_finestra.document.write(testo);
//ident_finestra.open();
//ident_finestra.document.write(testo);
ident_finestra.document.close();
ident_finestra.print();
ident_finestra.close();
}