Which domain name?

[creocast]

Heres the problem. I have 2 domain names:

mydomain.com
mydomain.co.uk

Now idealy these would point to 2 different webservers, one based in the usa and one in the uk. However the current setup is so that they both point to the same directory on the same webserver. But i would like to determine which domain name the user has used to access the website.

So if the user types in mydomain.com, american pricing ($) and american download links would be displayed.

However if the user types in mydomain.co.uk the pricing would be in £ and download/advertising links would be tailored towards a uk user.

So i would be grateful if anyone could suggest a piece of code to help me out with this problem

[sijis]

The only thing i can think of is using HTTP_REFERER

this will probably only work if someone clicks on a link to get to your site, otherwise.. you'd probably have to use an apache's mod_rewrite via an .htaccess file.

if(strstr($_SERVER['HTTP_REFERER'],'domain.com')){
   header("Location: http://domain.com/us/");
  //redirect to US based site.
} else if (strstr($_SERVER['HTTP_REFERER'],'domain.com.uk')){
   header("Location: http://domain.com.uk/uk/");
  // redirect to UK based site.
} else {
   header("Location: http://domain.com/choose/");
    // not exactly sure where user came from.
    // so make user choose their country
}