Here is the best answer http://toolbar.google.com/

It not only gives you access to the google search engine from any page, it include a popup blocker. The best part is that the popup blocker can be set to ignore any website. So, when I go to the starwood site (spg.com) I get to see the 500 point bonus popup that shows up. When I am at other sites, the popups are blocked.

Give it a try. You will love it.