public function getHtmlErrorCode($pos, $before=30, $after=40)
    {
        return substr($this->_html, $pos-$before, $before+$after);
    }
public function getHtmlErrorCode($pos, $before=30, $after=40)
    {
        return substr($this->_html, $pos-$before, $before+$after);
    }
public function getHtmlErrorCode ( $ pos , $ before = 30 , $ after = 40 ) { return substr ( $ this -> _html , $ pos - $ before , $ before + $ after ) ; }
return a part of the HTML code, for error message

@param   integer position
@param   integer take before
@param   integer take after
@return  string  part of the html code
return a part of the HTML code for error message