This machine has been hacked. Its owned by the german ISP "Hansenet" which hosts several user-websites on that box. All their user-pages have some additional JavaScipt-code attached, which opens popup-windows as soon as you click on anything, loading these popups from a domain whose name varies with time/date.
I looked at the JavaScript with Malzilla (using it for the first time), really cool tool!
Attached you find the disassembled JavaScript, i guess this is well-known malware, seems to have been written back in 2007.