How to include jquery from URL in custom module?
D7

For those who need to do this in D7, its as simple as

drupal_add_js('http://example.com/example.js', 'external');


D6

I can not take credit for this example but found this to be rather nice and easy way of dealing with external js files.  

$external_js = 'http://www.example.com/a.js';
drupal_add_js('document.write(unescape("%3Cscript src=\''. $external_js . '\' type=\'text/javascript\'%3E%3C/script%3E"));', 'inline');


Found this via http://www.wootenswebdesign.com/load-external-js-file-drupal-6