function apriDescrizione(id){
var x=550;
var y=290;
var x1=(screen.width-x)/2;
var y1=(screen.height-y)/2;
var page="popup_descrizione.asp?id=" + id;
var name="page" + id;
window.open(page,name,'left='+0+',top='+0+',width='+x+',height='+y +',resizable=yes,status=no,location=no,toolbar=no,scrollbars=auto');
}