title: Serve a script to desktops only, not smartphones?
body: <p>I have YouTube videos in my site opening in a modal window (ColorBox).  When I try it on my iPhone, the window launches but the video doesn't play.</p>
  
  <p>How can I prevent the modal window script from being served to smartphones, so that videos launch normally on those devices?</p>
  
  <p>Thanks!</p>