I was checking some articles on PCmag.com, when I clicked the laptops link to the left and then clicked on "top 10 laptops" which is a little square box near the middle of the viewable part of the page, and then started to scroll down about half way through the article and a little box appeared at the bottom right of the screen that had an article on the new iPad. I clicked more info and a pop up window came up that said "http://pcmag.com popsup " Only option was to click OK, which maybe I shouldn't have done I tried to make it pop up again and it would not until I reset safari then I could make it re-occur. Same thing happened in firefox as well except it was displayed slightly differently. Not sure what it is so figured it never hurts to ask. I didn't see anything install or attempt to install. Couldn't find anything searching about the popup. Sorry if messy, tried to explain it the best I could.