UPDATE: (Sep 6, 2007) Google just redid the entire A/B split testing process. See:
While GWO’s was originally created to test specific elements within a page, sometimes you want to test totally different versions of a page.
Lets say you want to test three totally different versions of page1.html. You create three new pages: page1a.html, page1b.html and page1c.html. You and then add some custom code to page1.html which redirects visitors to one of the new pages.
GWO added this feature a while back. You can read the official page at Comparing entire pages (A/B testing)
Recently, one of the posts on the Official GWO Forum mentioned a shortcoming of Google’s solution – the fact that it doesn’t carry forward the query string.
Lets say the URL of your main test page is
landing.html and one of your test pages is
If a user is sent to
landing.html?code=123 they will be forwarded to
landing_1.html and not
landing_1.html?code=123 which is what you probably wanted.
This is easier then you might think.
Look for this line in Google’s original code for your test page:
document.location = test_url;
and change it to:
document.location = test_url + self.location.search;