title: pass variable to iframe launch in fancybox
body: <p>I'm using fancybox to open an iframe that contains a submission form.</p>
  
  <p>The form is fairly generic (name, email, comments) however I need to pass the form a dynamic variable.</p>
  
  <p>How can I pass a variable from the parent page to my form in a fancybox iframe?</p>