More entries button

Dear reader,

I’d like to create a ‘more entries’ button at the bottom of my page. A button that ads new entries under the already loaded entries. So not on a new page. At this point I’m using this plugin:
http://www.problogdesign.com/wordpress/load-next-wordpress-posts-with-ajax/

It does display, but doesn’t fetch the next entries. I can’t think of a reason though since I am not at all experienced with AJAX.

Kind Regards,
Jasper