Alias Domain Names

Hi Guys, I'm having no luck creating some alias names for a Virtual Server. Here is what I have....

domain-name.com (parent) -intranet.domain-name.com (sub server)

The intranet.domain-name.com is displaying the correct www root.

But I would like the following domains to be aliases of intranet.domain-name.com. In other words, the following should show the website at intranet.domain-name.com.

intranet intranet.domainname.com

I've tried creating an "alias of intranet.domain-name.com" but that results in a different website from that web server being displayed.

I've also tried setting the ServerAlias directive for intranet.domain-name.com with the following with no luck. ServerAlias intranet intranet.domainname.com

Oh the agony! What have I done wrong!?