function ChooseLen(max_length, element_id, show_tag_id) {
   maxLength = max_length;
   M = document.getElementById(element_id).value.length;
   document.getElementById(show_tag_id).innerHTML = maxLength - M;
   if (M > maxLength) {
      document.getElementById(element_id).value = document.getElementById(element_id).value.substring(0, maxLength);
      document.getElementById(show_tag_id).innerHTML = "0";
   }
};

function print_life_years(begin_year) {
   current_year = new Date().getFullYear();
   if (current_year == begin_year) 
      document.write(current_year);
   else document.write(begin_year+"–"+current_year);
};