replacing hacked site

This site was not working well and I knew it but it was not a priority. Now it displays "Hacked By Moslem/Jakarta Paranoid Team". I had started a replacement for this site at and now need to move it to replace the hacked site. I do not have ready access to the domain pointers to simply change them to the new site and must rplace the old with the new where it sits. What would be the best way to manage this. I do have access to the hacked sites back end.