Parse error: syntax error, unexpected '`', expecting ';' or '{' ?

[eluser]anna16[/eluser]
Guys can you help me spot the not.

The error,

Code:

Parse error: syntax error, unexpected '`', expecting ';' or '{' in /home/coder9/public_html/ci172x/application/controllers/membership/site.php on line 28

The controller site.php

Code:

<?php
class Site extends Controller
{

    //function __construct()
  function Site()
    {
        parent::Controller();
        $this->load->library('session');
        $this->load->helper('form');
    $this->load->helper('url');
    
    $this->load->model('membership/membership');
    }
  
  function register_form()
  {
    $data = array();
    $data['email'] = '';
    $data['username'] = '';
    $data['password'] = '';
    $data['message_email_existence'] = '';
    $data['message_username_existence'] = '';
    
    $this->load->view('membership/register_form', $data);
  }

    function register_account()                                                                                    ``
    {
    $this->load->library('form_validation');
    $data['email'] = $this->input->post('email');
    $data['username'] = $this->input->post('username');  
    $data['password'] = $this->input->post('password');
    $data['ip'] = $this->input->ip_address();
    $data['date_registered'] = date("Y-j-n-");
    #$data['date_registered'] = '2010-31-31';
    #$data['date_registered'] = '';
    $data['confirm'] = 'no';

    //check for email validity, clean malicious data and duplicate    
    $this->form_validation->set_rules('email', 'Email', 'required|valid_email|xss_clean');
    #$this->form_validation->set_rules('email', 'Email', 'callback_email_check');
    
    //check for username validity, clean malicious data and duplicate        
    $this->form_validation->set_rules('username', 'Username', 'trim|required|min_length[4]|max_length[12]|xss_clean');
    $this->form_validation->set_rules('username', 'Username', 'callback_username_check');
        
    $this->form_validation->set_rules('password', 'Password', 'required|matches[confirm]');
    $this->form_validation->set_rules('confirm', 'Password Confirmation', 'required');

        if ($this->form_validation->run() == FALSE) //display the registration form again if invalid data is encountered.
        {
      $this->load->view('membership/register_form', $data);      
        }
        else
        {
      //add record and display success page
      $this->membership->register_account($data);
      $this->send_activate_email($data);
      $this->load->view('membership/register_success', $data);            
        }
    }

     function username_check($str)
  {
    $username_exist = $this->membership->get_username($str);
    if($username_exist == TRUE)
    {
      $this->form_validation->set_message('username_check', 'Sorry this username is already been use.');
      return FALSE;    
    }
    else
    {
      $this->form_validation->set_message('username_check', 'This username is available.');
      return TRUE;    
    }
  }
  
  function send_activate_email($data)
  {
    $this->load->library('email');
  
    $this->email->from('[email protected]', 'Admin');
    $this->email->to($data['email']);

    $this->email->subject('Activate your account');
    $this->email->message('Pleae click the link below to activate your account at samplesite.com');
    #$this->email->set_alt_message('Pleae click the link below to activate your account at samplesite.com<br><a href="coder9.com">click here</a>');    

    
    $this->email->send();    
  }  






/* ************************************* */
/*  Below are for testing purpose only.  */
/* ************************************* */
  function email_test()
  {
    $config = Array(
        'protocol' => 'mail',
        'smtp_host' => 'mail.coder9.com',
        'smtp_port' => 25,
        'smtp_user' => '[email protected]',
        'smtp_pass' => 'asdf1234',
        'mailtype' => 'html'
    );
  
    $this->load->library('email', $config);
    $this->email->from('[email protected]', 'Admin');
    $this->email->to('[email protected]');

    $this->email->subject('Activate your account - email test');
    $this->email->message('<b>Pleae click the link below to activate your account at samplesite.com</b><br>user: <br>pass: <br><br><a href="http://www.coder9.com">click here</a>');
    $this->email->send();  
    
  }  

  function show_username()
  {
    $this->load->model('membership/membership');
    $data['username_exist'] = $this->membership->get_username_test();
    echo 'username_exist '. $data['username_exist'];
    
    #$this->load->view('membership/register_form', $data);
  }
  
  //test boolean
  function show_return()
  {
      $name = TRUE;
      echo 'true: '. $name;
      
      echo '<br>';
      
      $name = FALSE;
      echo 'false: '. $name;
  }
  
  //test echo
  function echo_test()
  {
    $no = 45;
    echo 'value: ', $no;
  }
  
  function register_success()
  {
       $this->load->view('membership/register_success');
  }

}
//end of class

Thanks in advanced.