I just received it again and pm'ed you...
One of the banner networks on your site is automatically launching a pop up window for fake virus warnings that attempt to get me to install bogus software.
I'm not sure which of your banner networks is doing it, but the most recent incident tried to open the following URL:
http://188.124.5.151/index.html
And this is the message it gave me in a pop up ad
"Warning! Your computer contains various signes of viruses and malware programs presence. Your system requires immediate anti viruses check! Security will perform a quick and free scanning of your PC for viruses and malicious programs"
This has now happened to me twice and I have had to shut down your site so as not to get a virus.
Hope the site helps you identify the banner network!!