autoswitch_site_geoip

This module will detect the Country & the Default Language of the visitors on your website. It will then redirect them to a different language website (if you are running multi-site or Domain Access) or a different webpage on your site or any external or internal link of your choice.

This module is extremely lightweight and powerful. It doesnt

Please note : for IP and Language detection - this module uses an external web-service provided from : http://www.telize.com/ - which is free and opensource.

This is a redirection at the server level and not a JS based redirection.