<script type="text/javascript" src="/spreadsheets/jquery.js"></script>
<script type="text/javascript" src="YUI/yahoo-min.js"></script>
<script type="text/javascript" src="YUI/yahoo-dom-event.js"></script>
<link rel="stylesheet" type="text/css" href="YUI/fonts-min.css" />
<script type="text/javascript" src="YUI/cookie-beta-min.js"></script>
<script type="text/javascript" src="YUI/cookie-min.js"></script>
<link rel="stylesheet" type="text/css" href="YUI/tabview.css" />
<script type="text/javascript" src="YUI/element-beta-min.js"></script>
<script type="text/javascript" src="YUI/tabview-min.js"></script>
<link rel="stylesheet" type="text/css" href="YUI/container.css" />
<script type="text/javascript" src="YUI/container-min.js"></script>
None of these files exist on jsFiddle's server. You need to change your reference URLs.
What exists on your server has nothing to do with what exists on jsFiddle's server.
jsFiddle only knows a part of the path, /spreadsheets/jquery.js. That is a relative URL to their server. If you want your code to work on someone elses server, you either need to be able to put the files on their server to maintain the path structure, or change the URLs to be absolute.
<script type="text/javascript" src="http://YOURWEBSITE.com/spreadsheets/jquery.js"></script>