public function addStyle($style,$options=array())
    {
        $options["type"] = Utility::get($options, "type", "text/css");

        $this->tags[md5($style)] = array(
            "at"=>'begin',
            "tag"=>"style",
            "options"=>$options,
            "content"=>$style,
        );
        return $this;
    }