Error with show popunder in tablet or mobile

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Javascript

CSS

HTML

PHP

In my template I include a tool to show a pop-under when it is in tablet devices and other pop-under when it is other devices( cellphone, desktop,etc )
I tested and work perfect with banner, but when I try to use pop-under does not work, and I don';t know how fix it, If somebody can help me, thanks..

}
   if(is_tablet==1) {
       $("#tablet-ad-space").show();
       $("#mobile-ad-space").remove();
   }
   else {
       $("#tablet-ad-space").remove();
       $("#mobile-ad-space").show();
   }

---------------------------------------------------------------

And this is where I include the banner and popunder

<!-- Extra Ad block | Mobile - Starts here -->

<!-- Extra Ad block | Mobile - Ends here -->
<!-- Extra Ad block | Tablet - Starts here -->

<!-- Extra Ad block | Tablet - Ends here -->

What I have tried:

I tried to change but does not work, only work with banners, but when i include a pop[under this shot in tablet or mobile..