With joomla 3 you don't need to use such workarounds, you can put overrides in the js/jui folder for javascripts you wish to override and in css/jui folder for css. Joomla will load this files instead of default joomla ones.

Hi, Klass. Thanks for the reply.

You say to replace the Joomla core files, or in a specific location? How to perform the procedure?

Thank you.

Soorry, I forgot to mention this are subfolders in your joomla template, so boostrap.css would go to yourtemplate/css/jui/boostrap.css

Thanks again. I'll try your solution.

Really?!?! Wow, you never stop learning. Where did you get this information from? Is it a new (silent) added feature?

Klas. Perfect... Thanks. Problem solved.