Google CDN -> jQuery CDN fallback

jquery-cdn-fallback.html

<!--

See JSFiddle:
http://jsfiddle.net/cowboy/6asBw/

-->

<!-- unminified -->

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
<script>
// If jQuery failed to load from the Google AJAX APIs CDN...
window.jQuery || (function(doc, script, matches){
  // Get the preceding script tag.
  script = doc.scripts;
  script = script[ script.length - 2 ];

  // Parse the requested jQuery version number and whether or not it was minified.
  matches = script.src.match(/\/(\d+\.\d+)(\.0)?(\.\d+)?\/jquery(\.min)?\.js$/);

  // If there were matches, load the jQuery CDN version of the specified script.
  // Note that Google CDN version 1.4.0 maps to jQuery CDN version 1.4 and that
  // the jQuery CDN doesn't handle 1 or 1.4 the same way to Google CDN does, so be
  // sure to specify the full x.y.z version!
  matches && doc.write('<script src="http://code.jquery.com/jquery-' + matches[1] + ( matches[3] || '' ) + (matches[4] || '') + '.js"><\/script>');
})(document);
</script>


<!-- minified -->

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
<script>/*cowboy-jquery-cdn-fallback*/window.jQuery||(function(c,a,b){a=c.scripts;a=a[a.length-2];b=a.src.match(/\/(\d+\.\d+)(\.0)?(\.\d+)?\/jquery(\.min)?\.js$/);b&&c.write('<script src="http://code.jquery.com/jquery-'+b[1]+(b[3]||"")+(b[4]||"")+'.js"><\/script>')})(document)</script>