function scelta() {

  var type_paper = document.getElementById('r_n').value;

  switch( type_paper ) {
  
    case 'testo':
    
      document.location.href = '?sezione=myacpanel&ap_action=t_paper';
    
    break;
    
    case 'file':

      document.location.href = '?sezione=myacpanel&ap_action=f_paper';
    
    break;
  
  }

}