There was a time not so long ago when you could barely open a Web site without being buried with pop-up ads -- unwanted windows advertising everything and anything up to and including the kitchen sink.
They existed for one very good reason: Annoying as they were, they worked.
Then, the Web browser makers got wise to the ways of pop-up ads, and enabled people to block them. Even Microsoft Corp., which was way behind the curve on this one, finally added the ability to stop most common pop-up ads to Internet Explorer with its Service Pack 2 update to Windows XP.
Unfortunately, that wasn't the end of pop-up ads.
Now advertisers have begun figuring out new ways to evade pop-up restrictions, and companies with goods and services to sell have been more than happy to place ads via these new channels, resulting in unpleasant surprises for users of such pop-up-blocking browsers as IE, Firefox, Safari and Opera.
This new crop of intrusive ads comes in two forms. One, pop-unders, appear behind the page you're viewing instead of in front of it. While that saves you from having your Web experience disrupted by a series of Viagra ads exploding in front of your nose, it still leaves you with an ad in front of your face when you close a browser window.
Why do companies go to the extra trouble of putting a pop-up or pop-under ad in front of users who, by choosing a pop-up-blocking browser, obviously don't want them?
Because people respond to them anyway, say companies that buy these types of ads.
"They work," said Susan Wade, spokesperson for Herndon-based Network Solutions Inc. "While they're only a small part of our media mix, they do help."
If online ads get too annoying, they will backfire on advertisers. But it's not clear yet if the latest proliferation of pop-ups has reached that point.
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