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Scooter24 - 3:55 pm on Apr 9, 2004 (gmt 0)
They do so basically by checking if there is an enabled popup blocker and in that case serve the ad as a "Layer ad". [edited by: eljefe3 at 4:21 am (utc) on April 14, 2004]
In case anybody is interested, there is a German software house which developed a software which circumvents popup blockers, i.e. delivers ads even if the user has a popup blocker enabled. The article (sorry only in German) is here:
[golem.de...]