How to use an external jQuery plugin with Drupal's no-conflict jQuery
In Drupal 7, if you a certain that the external scripts are attempting to use "$" as an alias for jQuery, and you can't get the script author to patch their code, and you aren't loading any other JavaScript libraries, then in your template_preprocess_page, place the following drupal_add_js before the set of all drupal_add_js that reference external files. All scripts in the header region that use "$" as an alias will then refer to jQuery:

drupal_add_js('var $ = jQuery;', 'inline');


If your external javascript is added in another region, for example, the footer, then use something similar to the following instead:

drupal_add_js('var $ = jQuery;', array('type' =&gt; 'inline', 'scope' =&gt; 'footer'));