Pop-up blockers that stop most of those annoying popping ads are built into the newest versions of the Internet Explorer (Windows Service Pack 2) and Firefox browsers. If your browser doesn’t include pop-up blocking, you can get good pop-up blocking from the Google or Yahoo! toolbar. When using a pop-up blocker, there will be times when you will need to disable it for a particular site, so be sure to learn how to turn it on and off. Learn more at this training page from the University of Wisconsin.