title: Phonegap and interstitial ads
body: <p>I'm trying to display interstitial ads on a phonegap app but i just can't make it work.
  I have followed this tutorial from google <a href="https://developers.google.com/mobile-ads-sdk/docs/admob/advanced?csw=1#play" rel="nofollow">https://developers.google.com/mobile-ads-sdk/docs/admob/advanced?csw=1#play</a> but the ads don't show. 
  I think a need a trigger in my html to make the ads popup but how do I do it?</p>
  
  <p>I'm a newbie, so any help is welcome.</p>
  
  <p>Thank you.</p>