I currently have a site and two domains. I want to make a mirror site of my original site and have one of my extra domains point to it.

How do I set up another website so I can point my extra domain to it? This way... it is treated as a seperate site by the search engines.

Browser: FireFox

OS: Vista

You know how to build a site.
You know how to point a domain to that site.
So exactly what information do you require in order to do the same thing again?

Can I have two sites under one bravenet account?

Yes. For details see the Hosting Matrix

There really is no way to do it. Link-build one primary and the mirror will fall out.

Browser: Firefox

OS: Windows 7 Home Premium 32 bit

I have one account. two Domains. and 8 current sites (4 on each Domain) with another 4 dormant, all with Bravenet. so whats the problem. I have often run two indentical sites on two different Domains or even on freebies

To build a mirror site you must use relative addresses in all links. The mirror site will have a different domain or sub domain name.

If you are looking to do something sophisticated like route visitors to a different data centre depending on their location (as Google does) then you should be asking in a professional forum such as webmasterworld.

Browser: firefox