I am using the simplest Lightbox plugin for my site which works just fine when I am working local. Once I host the site, the jquery is still there, it's just the larger images don't actually load. Also, when working local, the "next", "previous" and "close" buttons don't show up. I downloaded my plugin here, http://leandrovieira.com/projects/jquery/lightbox/

See for yourself what I am talking about. http://www.karendringenberg.com/

This is the code in the head of my html:

<script src="js/jquery.js" type="text/javascript"></script>
<script src="js/jquery.lightbox-0.5.js" type="text/javascript"></script>
    <link href="js/jquery.lightbox-0.5.css" rel="stylesheet" type="text/css" media="screen" />
    <script type="text/javascript">
        $(function() {
            $('#portfolio ul li a').lightBox();
        });
    </script>

My CSS is set to match the script and the plugin is loaded in my root folder within a /js/ folder.
I am definitely a newbie at this and would welcome any suggestions or ideas. I have all the files on my hosting server, I just don't understand why it won't recognize the larger "zoom" graphics or the navigation within the script. Let me know if there is any other info needed. Thanks in advance!