Fixed the browser hijack problem
I discovered that the problems that I had with HarpAmps redirecting users to new pages was due to Chitika.com, and advertising group. I used to have a little graphic section where you could buy harmonicas and amps from various stores. I put this way down at the bottom of the page so it wouldn't bother anyone. These ads started going nuts over the weekend.
I turned off most of my Chitika ads today. Their new premium ads were the cause of the browser hijacks. Chitika started their premium program because, they claim, the older per-per-click ads weren't working. They never did more than a dollar a day for me on about 8,000 exposures, but I considered this to be a problem with the fact that I placed them below the fold, near the bottom of a long pages.
Premium is a misnomer for their new product. What they did was resell their ad space to doubleclick and other advertisers. Along the way they were not very careful about who they were selling to, because the ads resulted in the execution of javascript that produced popups and in some cases page redirection to other websites.
Popups suck and I never want them on my page. Browser redirects are unacceptable. I opted out big time. I am now going through and removing Chitika code from websites. I don't need users calling me up about problems for a lousy dollar a day.