Sounds like a hijack virus to me,the site management should be notified at once so they can see if it affecting the site or maybe it is your pc that is infected
You should contact them either way.If you do not have this already you should download and run hijackthis here
http://free.antivirus.com/hijackthis/
See if it catches anything,if you get this message when trying hijackthis
A required .DLL file, MSVBVM60.DLL, was not found then your going to need another try,you can try changing the name of the file from hijackthis to whatever you want or try a different scan
Keep us updated.