Show 'this' if desktop-show'that' if mobile

As per the title,want to show different ad script on phpbb forum if using desktop or mobile.
I have ads that are not responsive.

I have this...
http://ift.tt/OC5nUq

<div class="mobileShow">
TEXT OR IMAGE FOR MOBILE HERE
</div>
This div will declare that this copy will respond only when the class is triggered. By adding the code below, the class will only be triggered when the user is on a mobile device. Add the following code...
Code (markup):
Show 'this' if desktop-show'that' if mobile

from HTML & Website Design http://ift.tt/1oIl6UA
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