hi, thanks for the reply..
the url is
http://ugotitbabe.com
it seemed to be that the popups started when I clicked on the enter link on the front page of my site. I have been downloading some mp3s today so it could be you've got the right explanation. I just hope visitors to my site haven't been seeing these popups.
I haven't got adware or any other similar program. is there anywhere to download for free (except kaaza of course)
thanks again