J-BusinessDirectory - Hacking my website

Hi, first of all, sorry for my google translate English. I open this thread because it has been hacked a web page of mine where I have also hosted a page of j business. I mainly make this mention here because I do not control the webs very much and if this serves much better help.

1º I detected that someone registered in the web j-business directory, of name SOK

<a href='http://www.subirimagenes.com/fotos-sok2-9764950.html'><img src='http://s2.subirimagenes.com/fotos/previo/thump_9764950sok2.jpg' alt='subir imagenes' border='0'></a>

2º to the few hours I enter in another web page hosted in the same server (nothing has to see j-business directory) and I appear this.  If you look well the name of the hacker is the same that was registered in my page of j-business

Hi,

Usually, hackers create an account on the site and then try to exploit any security issue that they find.
I do not know how we can help you in this case.