This is something you have to do with your host, or cpanel if you have it and the right access.
What you want to do is "park" additional domains on your account.
I do this-
You can go to:
http://www.juot.net/forums/showthread.php?t=19281
You can also change from juot.
net to juot.
co and go to the exact same content. In fact instead of juot.net you can change it to jeepersunlimited.com and again get the same content.
Whichever one you enter from, you wll stay on that domain.