Wp grins works on localhost but not on server

I have a local server (ie http://localhost; XAMPP) setup to do all my development before I upload everything to an external server. I installed wp grins on my local server, and it works. The click-able smilies come up under the textarea box for both comments and the admin panel. There is no difference between the local’s and the server’s files. They both have the comment id of “comment” and both call wp_head();.

How come it works locally but not on an external server?

Thanks.