jQuery not working

Hi,

I am using Mystique wordpress plugin and want to execute some jQuery code as below:
Hide elements along with cookie on link click.
I added the following code to my header.php file:

<?php wp_enqueue_script('jquery'); ?>
<script type="text/javascript" src="/wp-content/themes/mystique/js/jquery.cookie.js"></script>
<script type="text/javascript" src="/wp-content/themes/mystique/js/jquery.showhide.min.js"></script>

<script type="text/javascript">
jQuery(document).ready(function($) {
$('#ex-6').showhide({
    use_cookie: true,
    cookie_name: 'example_6'
});
});
</script>

Then added the element with id as ex-6 in the sidebar widget as:

<p>
    <a href="#" title="Toggle the span" id="ex-6">Ads Off</a>
    <span>ABC</span>
</p>

You can check all the action on
http://extreme-java.com/coding-best-practice-always-validate-method-arguments

But clicking on that ads off link doesn’t invoke the jquery code.

I can achieve the hide show with simple div style attribute but I need to set a cookie regarding user option for 3 days.

Any ideas guys.