Help! How to use Zend_Search_Lucene in CI

[eluser]helphelp[/eluser]
Hi, i have troubles using it.
I am stuck on this

$doc = Zend_Search_Lucene_Document_Html::loadHTMLFile($filename);
http://framework.zend.com/manual/en/zend...-documents

Can i do this?

$doc = Zend_Search_Lucene_Document_Html::loadHTMLFile(‘http://www.google.com’);
or
$doc = Zend_Search_Lucene_Document_Html::loadHTML(‘http://www.google.com’);

Examples are really help

Thanks a lot