[Plugin: Like-Button-Plugin-For-WordPress] wp-lists.js conflict?

The like-button-plugin-for-wordpress plugin causes a js error when activated. Firebug shows “ajaxurl is not defined” and references the wp-lists.js. This happens if im logged in as admin or not. This is with the newest version of wp and this plugin at the time of this post.

http://wordpress.org/extend/plugins/like-button-plugin-for-wordpress/