hte best way to make a popunder script that will work is dont do it automatically.
if the popunder happens as part of a user action, lots of the browsers do not block that.
like put in teh body tag onclick=popunder and for the most part it will work.
i always advise on finding other methods of marketing besides this popunder stuff from the 90's in the same way you wouldnt want doctors selling you cigarettes anymore. there are many other better ways to get that information to your users
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