function show_date(id_name) {
   var now = new Date();
   var day = now.getDate();
   var month = now.getMonth() + 1;
   var year = now.getFullYear();
   var weekday = now.getDay();
   var day0  = ((day < 10) ? "0" : "");
   var month0  = ((month < 10) ? ".0" : ".");
   var today = day0 + day + month0 + month + "." + year;
   document.getElementById(id_name).innerHTML = today;
}