added domain but not properly


Im new in all this, but I have Ubuntu 11.4 and ehcp 0.30.9

I have installed EHCP and I have added my domain.

But when I go to my domain with the www. in front of it I get :

Apache is functioning normally

and when I go to the domain without www. then I see the under cunstruction page so that is correct.

I want that my site is vissibel when people go to www. or without the www.

So it must also work properly with using www.