Conditionally Loading jQuery

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if window.jQuery is undefined, there must have been a problem downloading the script from the CDN. In that case, proceed to the right side of the && operator, and insert a script linking to a local version of jQuery.

Copy this code and paste it in your HTML
  1. <!-- Grab Google CDN jQuery. fall back to local if necessary -->
  2. <script src=""></script>
  3. <script>!window.jQuery && document.write('<script src="js/jquery-1.4.2.min.js"><\/script>')</script>


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