For some reason the jQuery UI Accordion does not work. I keep getting this error:

TypeError: $(...).accordion is not a function

What am i doing wrong? Based on other answers on this site on similar topics, i think it has something to do with the included files.

My header includes are:

<!-- Mobile Specific Metas -->

<meta name=viewport content=width=device-width, initial-scale=1, maximum-scale=1>  



<!-- CSS -->

<link rel=stylesheet href=<?php echo base_url(); ?>css/base_con.css>

<link rel=stylesheet href=<?php echo base_url(); ?>css/skeleton.css>

<link rel=stylesheet href=<?php echo base_url(); ?>css/layout.css>



<!--[if lt IE 8]>

<script src=http://ie7-js.googlecode.com/svn/version/2.1(beta4)/IE8.js></script>

<![endif]-->



<!--[if lt IE 9]>

<script src=http://html5shim.googlecode.com/svn/trunk/html5.js></script>

<![endif]-->



<!-- Favicons -->

<link rel=shortcut icon href=<?php echo base_url(); ?>images/favicon.ico>

<link rel=apple-touch-icon href=<?php echo base_url(); ?>images/apple-touch-icon.png>

<link rel=apple-touch-icon sizes=72x72 href=images/apple-touch-icon-72x72.png>

<link rel=apple-touch-icon sizes=114x114 href=images/apple-touch-icon-114x114.png>

<link rel=stylesheet href=<?php echo base_url(); ?>css/custom-theme/jquery-ui-1.10.0.custom.css type=text/css />



<!-- Scripts -->

<script src=<?php echo base_url(); ?>js/jquery-1.9.0.js></script>

<script src=<?php echo base_url(); ?>js/jquery-ui-1.10.0.custom.js></script>

<script src=<?php echo base_url(); ?>js/responsiveslides.min.js type=text/javascript>