First, a domain name is simply a human readable substitute for the website's IP address. So, changing the registrar should have NO effect on the website provided the correct DNS servers (DNSx.NETTICA.COM) are provided to the new registrar.
Second, perhaps I mis-read your question and you're talking about moving your website rather than registrar. If that's the case, you'd better hope that both the old and new hosts are using cPanel so ALL the information on the old host is transferred to the new host. The benefit there is that the e-mail information should be retained as well as the website scripts and databases.
Finally, if the friend is, indeed, a friend, let him know that GoDaddy has a horrible reputation as a host (despite a good reputation as a registrar). In other words, I'd advise AGAINST moving the website to GoDaddy.