public function check_signup() {
		
			$this->load->library('form_validation');

			$this->form_validation->set_rules('username','Username','required|min_length[3]|max_length[16]|xss_clean|trim|callback_validate_username');
			$this->form_validation->set_rules('password','Password','required|min_length[6]|xss_clean|callback_validate_signup_passwords');
			
			
			return $this->form_validation->run();
		}
		
		public function validate_username($user) {
		
			die("validate username called");
			
			if(!preg_match("/^[a-zA-Z0-9]+$/", $user)) {
				
				$this->form_validation->set_message('validate_username', '%s must not contain symbols');
				return false;
			}
			return true;
		}