Masked Url Subdomain,

I am developing a site for my employer in ASP, and we host our own servers. The company sells direct to people in the US, and we have authorized resellers sell to international customers. This site applies a customized header and footer (as include files) based on information collected in a cookie.

The point of these customized headers and footers is so that our authorized resellers can have their company info on our product pages. So as long as a visitor starts at a customized "launching page" for a particular reseller, the cookie will have that reseller's headers and footers on every page of our site. This all works fine.

My problem is the url in the browser address bar. It will still say "www.mycompany.com/whateverpage.asp", regardless of what headers and footers are applied. We want all references to "mycompany" erased when customers are looking at our authorized resellers' pages. My employer wants it to have a different url in the address bar that relates to the reseller.

What if we went the subdomain route, registered a more generic domain, and made subdomains off that domain for the resellers? Like, www.widgets.com with subdomains like www.acme.widgets.com? I know this is possible, but how then would I apply these new subdomain urls in the browser windows for pages that are on the www.mycompany.com site?