How to fix this code???

[v123shine]

I found this simple plugin. This plugin automatically change all link into no link but i want exculde 2 site, example: vbulletin.org dan vbulletin.com -- How can i do that?

This is the plugin i put in postbit_display_complete:

PHP Code:

$link = array(
'href'
);

$word = array(
'hxxf'
);

$this->post['message'] = str_ireplace($link, $word, $this->post['message']); 


Help me, please!