function countdown() {
	secs--
	if (secs > 0) $('time_left').innerHTML = secs;
	if (secs <= 0) timedout();
}
function isMovieTheaterValid() {
      if ($('booking_movie_id').value == '' || $('booking_theater_id').value == '') {
       alert('Please select a movie and a theater!');
       return false;
      }
      return true;
}