Xampp shouldn't have anything to do with JS not working.Just make sure the JS file links are correct. One short way is open the page in firefox. Right click and view the source. In the source, click the link of where the JS is located (the src in the script tag) and if it leads, its fine. If it doesn’t find it, its probably a wrong location.
The link is fine though. I used firebug in FireFox to check the links in the header and they linked to the JS file. I’ll double check it again.