function add_tf_observer(field_id, tf_cat, tf_action,tf_label,tf_value) {
    Event.observe(field_id, 'click', function(event) {
         _gaq.push(['_trackEvent', tf_cat, tf_action, tf_label, tf_value]);
        });
  }

function updateguests(roomcount) {
 if (roomcount > 1 && (parseInt($('hotel_search_number_adults').value) + parseInt($('hotel_search_number_children').value) < 2)) {
   $('hotel_search_number_adults').selectedIndex = 1;
 } 
}