I am struggling with domain mapping. I have installed

Hello.
I am struggling with domain mapping.
I have installed the plugin and it seems to be working fine at the site. I believe that i am doing the DNS settings wrong.
My main site is avestreger.dk
My sub domain is nemvejen.avestreger.dk
And I would like my visitors to see the site at this adress: nemvejen.dk
Both the domains has the sme IP adresse and is hosted in the same webhotel.
I have deleted the 4 lines in the config file.
You can see my settigs here:
http://avestreger.dk/2013/05/11/5/

What am I doing wrong?
Thank you in advance
Mette