How do I control which javascript files it includes and link via relative urls?

Contact Form 7 includes Javascript files via a non-relative URL (so it shows up as “http://localhost/wordpress/wp-includes/js/jquery/jquery.js?ver=1.7.2” which doesn’t work)

How do I make it include the files (scripts and stylesheets) via relative urls?

Also, I already use jQuery (a later version) so I’d like to use that version instead. How do I change this?

http://wordpress.org/extend/plugins/contact-form-7/