Change Header Depending to Screen Size

[RedTurtle]

Thank you so much for this thread. I am trying to do something similar.

I created a plugin that hooks into global_setup_complete and determines when to show a second advertisement on my forum to a guest visitor. Currently it is setup to only show a second advert if the user is not using a tablet or a phone to view the page. I would also like to add the check for screen width at the plugin level.

I have the following code:

global $vbulletin, $show;
//If the user isn't using a phone or tablet to view the site, show the second advertisement.
if (!$vbulletin->detect->isMobile() AND !$vbulletin->detect->isTablet() ){
$show['second_header_ad'] = true;
}

How can I modify this to also check screen width?

Thank you!