PP...
Hmm.. don't know where to start here because I think you have a basic misunderstanding of how some things work.
You said earlier that you had the domain dns pointing to webairs nameservers NOT to your server at 69.42.75.204.
BUT webairs nameservers point to that ip for the domain and if you go to that ip directly, you will get the porn site you are talking about.
It looks (from what I can see) like you have changed the nameservers in your domain record to point to the nameservers at interip.nl but you have the entry still pointing to the same ip (69.42.75.204) which eans that the domain will continue to go to the porn site.
You need to edit the entry so they are pointing at a different ip if you want the porn site to go away when folks look for your friends site.
from my whois tools:
www.fuji-ya.nlLOOKUP
;Question:;resp bb11 opcode:00 aa:0 tc:0 rd:1 ra:0 rcode:0 QD:1 AN:0 NS:2 AR:2
;NS:
fuji-ya.nl. 1D NS dns2.interip.nl.
1D NS dns1.interip.nl.
;Additional:
dns1.interip.nl. 1D A 81.4.76.10 ; rtt:144
dns2.interip.nl. 1D A 81.4.76.20 ; rtt:143
;NOERROR NORECURSE 4 answers.
;Question:;resp b6c4 opcode:00 aa:1 tc:0 rd:1 ra:0 rcode:0 QD:1 AN:1 NS:3 AR:3
;Answer:
www.fuji-ya.nl. 5M A 69.42.75.204 ; rtt:78(netlen:24)
;NS:
fuji-ya.nl. 5M NS dns1.interip.nl.
5M NS dns2.interip.nl.
5M NS dns3.interip.net.
;Additional:
dns1.interip.nl. 5M A 81.4.76.10 ;NOT trusted (yet); rtt:144
dns2.interip.nl. 5M A 81.4.76.20 ;NOT trusted (yet); rtt:144
dns3.interip.net. 5M A 195.128.185.96 ;NOT trusted (yet); rtt:162(netlen:20)
;NOERROR AUTH NORECURSE 7 answers.
********************************************
From what I can see, the nameservers at interip are STILL returning the ip you do not want them to go to.