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I am creating a custom theme and I would like to know how to update the path of jQuery to use a CDN like the following:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>

I don't want to use another module. I just want a simple way to change the path of the script.

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Add the following code in the template.php file of your theme. (Replace mytheme with the actual short name of your theme.)

function mytheme_js_alter(&$javascript) {
  $javascript['misc/jquery.js']['type'] = 'external';
  $javascript['misc/jquery.js']['data'] = 'http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js';
}

As you are replacing the copy of the jQuery library with the same version copy hosted on Google, it doesn't make much sense to do it for just a theme. It would make sense to change it independently from the theme used from Drupal.

If you plan to use a different version of the library, you should first check there aren't incompatibilities with the jQuery version, and JavaScript code used from Drupal, or third-party modules. In case of incompatibilities, some JavaScript files used by Drupal could need to be replaced (using hook_js_alter()). That is what the jQuery Update module does.

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