function crea_testata(category) {
document.title=category;
cont=0;
while (cont<max_category) {
   if (category==categ[cont].category) {
      document.writeln('<h1><img alt="'+categ[cont].category+'" title="'+categ[cont].category+'" src="'+categ[cont].icon+'" width=64 height=64>&nbsp;&nbsp; '+categ[cont].title+'</h1>');
      document.writeln('<br>');
   }
   cont++;
}
}