HI,
Our company currently have 2 websites (ours and our sister company)
Currently it’s 2 different domain and websites.
We want to merge those 2 into one single website (the one using Xtheme of course).
Let’s call them Company A & Company B,
We have 2 domain names a.com & b.com
Now, we’ll flush the website for .b.com and we’ll use the domain as a redirect to www.a.com.
What my boss want is that if we access a.com there will be a popup with two images (big canada and usa flags) and clicking on one or another will define the logos used on the website & menu (not affecting languages). (If it could remplace all "Company A names with Company B name that would be really awesome).
What could be cool as well is if we type www.b.com, while we’re redirected to a.com the logos would already be those from company B as it would 'know" that’s what we want.
This would be very nice but I have no clue of how to do it, how this technic is named,I only know how to explain it.
Hope someone could help me or point me the right direction 
Thanks.