Using js to redirect subdomains
I have an exising site that I would like to use some subdomains to promote different aspects of the site. However, I really can't move these pieces to another virtual site, so I'm looking to use js to redirect a request to another page.
Here's what I want to do.
Point the following domains to a single ip:
On the single ip, have an index page that would read the header of the request and route shop.powwows.com to www.powwows.com/shop and gathering.powwows.com to www.powwows.com/gathering/
Would this work?
What would I need to put in js to do this?
Or is there a better way?