code: public function generateQuestion()
  	{
  		return sprintf('<span id="captcha_text_%s" class="captcha_text%s">%s</span>',
  						$this->strId,
  						(($this->strClass != '') ? ' ' . $this->strClass : ''),
  						$this->getQuestion());
  	}
docs: Return the captcha question as string
  
  @return string The question markup