CDN Fallbacks

cdn-fallback.html

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script>window.jQuery || document.write('<script src="js/jquery-1.7.2.min.js"><\/script>')</script>

<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.8.21/jquery-ui.min.js"></script>
<script>window.jQuery.ui || document.write('<script src="js/jquery-ui-1.8.21.min.js"><\/script>')</script>

<script src="//ajax.googleapis.com/ajax/libs/swfobject/2.2/swfobject.js"></script>
<script>window.swfobject || document.write('<script src="js/swfobject-2.2"><\/script>')</script>


<link rel="stylesheet" href="//ajax.googleapis.com/ajax/libs/jqueryui/1.8.21/themes/base/jquery-ui.css" />

<div class="ui-helper-hidden"></div>

<script>
    $(document).ready(function() {
        // Checks if the above is hidden (by jQuery UI) and if not, use the local UI CSS file
        if ($('.ui-helper-hidden:first').is(':visible') === true) {
            $('<link rel="stylesheet" href="css/jquery-ui-1.8.21.css" />').appendTo('head');
        }
    });​
</script>