Is it possible to have a script setup that will load a include file based upon site name?

What I want to do is have include file that will load based upon if the domain is like dev.domain or www.domain

In other words,

http://dev.domain.com ----> include file dev.asp
http://www.domain.com ----> include file live.asp

The reason for this is I want to make it easier to deploy asp pages with the minimal amount of changes from Dev to live.

Anyone know if this is possible?