jquery navigation will not work

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Hello all. I am trying to get a responsive hard coded navigation menu to work with Concrete5 5.6.0.2.

When I download the navigation menu and run it from my desktop it works fine. But when I try and incorporate it to CC5 it will not work.

I have had success using CC5 with other navigation menus that use jquery, but I just cant get this one to access the run/access the.js file.

In my theme header file I have:

<script src="<?php echo $this->getThemePath()?>/js/jquery.meanmenu.js"></script>

<script>
jQuery(document).ready(function () {
jQuery('header nav').meanmenu();
});
</script>

</head>

Am I missing something here?

Many thanks.