I have installed the nivoslider and the javascript is not appearing on the page.

This is the script that is appearing:
<link rel="stylesheet" type="text/css" href="includes/templates/hck/css/stylesheet.css" />
<link rel="stylesheet" type="text/css" href="includes/templates/hck/css/stylesheet_css_buttons.css" />
<link rel="stylesheet" type="text/css" href="includes/templates/hck/css/stylesheet_tables.css" />
<link rel="stylesheet" type="text/css" media="print" href="includes/templates/hck/css/print_stylesheet.css" />
<script src="includes/templates/hck/jscript/css_browser_selector.js" type="text/javascript"></script>
The templates/hck/jscript/ contains the following files: css_browser_selector, jquery.nivo.slider, jquery-1.5.1.min, but as you can see the one javascipt file appears but the other 2 don't.

Does anyone know why?