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

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

I had jmenu and selectBoxIt plugins working in release.vbhtml until i added the following $(document).ready(function ...   and added in
<script src="@Url.Content("~/Scripts/jquery-2.0.3.js")" type="text/javascript"></script>

Now when I run release.vbhtml it complains jmenu and selectBoxIt are not functions in the firefox browser console.
The jmenu code is being picked up in Layout.vbhtml (Master layout page)
Could you provide any suggestions on getting these working again