Reload mouse แล้วต้องการให้ validation_errors มันหายไปต้องเพิ่มคำสังยังไงครับ

            <?php if(validation_errors()){ ?>
            <div class="alert alert-danger" role="alert"> <?php echo validation_errors();  ?> </div>
            <?php }?>
          

function register() { 
	
	$data['title'] = 'register';
	$this->load->helper('form');
	$this->load->view('templates/header',$data);
	$this->load->view('templates/menu');
	$this->load->view('page/register');
	$this->load->view('templates/footer');
	
	}

    function register_validation()
	{
		$this->load->library('form_validation');
		$this->form_validation->set_rules('username','User Name','required|trim|xss_clean|min_length[3]|max_length[12]');
		 
						
						
		$this->form_validation->set_rules('email','Email','required|trim|xss_clean|is_unique[user.email]|valid_email',
		array('is_unique'=>'อีเมลนี้มีผู้ใช้งานแล้ว'));
		
		$this->form_validation->set_rules('password','Password','required|trim|xss_clean|min_length[6]|md5');
		$this->form_validation->set_rules('confirm_password','Confirm Password','required|trim|xss_clean|min_length[6]|md5|matches[password]');

		
		
		
		if($this->form_validation->run()==FALSE)
		{
			    $data['title'] = 'register';
				$this->load->view('templates/header',$data);
	            $this->load->view('templates/menu');
	            $this->load->view('page/register');
	            $this->load->view('templates/footer');
				
				
				
			
			
			
		}else
		{
			$this->load->model('user');
			$activation=md5(uniqid());
			$this->user->insert_user($activation);
			$this->load->library('email');
			
			
			$this->email->from('[email protected]','xxxxxx.com.com');
			$this->email->to($this->input->post('email'));
			$this->email->subject('Activate Your Account At xxxxxx.com');
			$message="<p>Thank you for registering !";
			$message.="<a href='". base_url()."page/activation/".$activation."'>Click here to activate your account</a>";
			$this->email->message($message);
			if($this->email->send())
			{
				echo 'Kindly chrck your email'.$this->input->post('email').'to activate your account!';
			}
			else
			{
				echo "Cannot send email! Kindly contact to our customer service to help you!";
			}
		}
		
	}