Changing a domain name

Ok, I built a site with a zen cart using a domain name. Now the customer wants a different domain name. Since I changed the name on my server, the site works but the store doesn't seem to be displaying the images properly. I didn't do much testing other than checking to see if I could login under admin, and I could not. So I switched it back and will forward the domain that they want to th working site. But eventually, I would like this to work. Do I only need to change both configure files to make this work or is there anything else I will need to do?

Edit includes/configure.php and admin/includes/configure.php

If you change the two config files that Yellow named, you should be ok. Simply replace any occurences of the old domain name with the new one.