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Proper way of loading jQuery from Google\'s CDN with fallback to local lib if necessary

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Proper way of loading libs such as jQuery from Google's CDN. Place these JavaScripts at the bottom for fast page loading. To target different versions, you can be more specific if you want; eg. /1.4/ or even /1.4.4/.

(NOTE: you may either use http:// or https:// depending on your needs. Both will work.)

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Copy this code and paste it in your HTML 
  1. <!-- Load jQuery from Google's CDN -->
  2. <script src="//ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.js"></script>
  3. <!-- Fall back to local lib if loading from Google's CDN fails -->
  4. <script>!window.jQuery && document.write(unescape('%3Cscript src="js/libs/jquery-1.4.4.js"%3E%3C/script%3E'))</script>

URL: http://code.google.com/intl/en-US/apis/libraries/devguide.html

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