public function courseindex()
{
$course_id = $_GET['id'];
$course = new CourseModel();
$message = new MessageModel();
$usertype = Cookie::get('usertype');
$username = Cookie::get('username');
$userid = Cookie::get('userid');
$courselist = $course->where("course_id='{$course_id}'")->find();
$messagelist = $message->where("course_id='{$course_id}'")->select();
$this->assign('course', $courselist);
$this->assign('messagelist', $messagelist);
$this->assign('usertype', $usertype);
$this->assign('username', $username);
$this->assign('userid', $userid);
$this->display();
}
